fix: use A2UI_EXTENSION_URI for catalog label

docs/docs.json

@@ -351,7 +351,9 @@
                       "en/learn/using-annotations",
                       "en/learn/execution-hooks",
                       "en/learn/llm-hooks",
-                      "en/learn/tool-hooks"
+                      "en/learn/tool-hooks",
+                      "en/learn/a2a-agent-delegation",
+                      "en/learn/a2ui"
                     ]
                   },
                   {
@@ -810,7 +812,9 @@
                       "en/learn/using-annotations",
                       "en/learn/execution-hooks",
                       "en/learn/llm-hooks",
-                      "en/learn/tool-hooks"
+                      "en/learn/tool-hooks",
+                      "en/learn/a2a-agent-delegation",
+                      "en/learn/a2ui"
                     ]
                   },
                   {

docs/en/learn/a2ui.mdx

@@ -0,0 +1,344 @@
+---
+title: Agent-to-UI (A2UI) Protocol
+description: Enable agents to generate declarative UI surfaces for rich client rendering via the A2UI extension.
+icon: window-restore
+mode: "wide"
+---
+
+## A2UI Overview
+
+A2UI is a declarative UI protocol extension for [A2A](/en/learn/a2a-agent-delegation) that lets agents emit structured JSON messages describing interactive surfaces. Clients receive these messages and render them as rich UI components — forms, cards, lists, modals, and more — without the agent needing to know anything about the client's rendering stack.
+
+A2UI is built on the A2A extension mechanism and identified by the URI `https://a2ui.org/a2a-extension/a2ui/v0.8`.
+
+<Note>
+  A2UI requires the `a2a-sdk` package. Install with: `uv add 'crewai[a2a]'` or `pip install 'crewai[a2a]'`
+</Note>
+
+## How It Works
+
+1. The **server extension** scans agent output for A2UI JSON objects
+2. Valid messages are wrapped as `DataPart` entries with the `application/json+a2ui` MIME type
+3. The **client extension** augments the agent's system prompt with A2UI instructions and the component catalog
+4. The client tracks surface state (active surfaces and data models) across conversation turns
+
+## Server Setup
+
+Add `A2UIServerExtension` to your `A2AServerConfig` to enable A2UI output:
+
+```python Code
+from crewai import Agent
+from crewai.a2a import A2AServerConfig
+from crewai.a2a.extensions.a2ui import A2UIServerExtension
+
+agent = Agent(
+    role="Dashboard Agent",
+    goal="Present data through interactive UI surfaces",
+    backstory="Expert at building clear, actionable dashboards",
+    llm="gpt-4o",
+    a2a=A2AServerConfig(
+        url="https://your-server.com",
+        extensions=[A2UIServerExtension()],
+    ),
+)
+```
+
+### Server Extension Options
+
+<ParamField path="catalog_ids" type="list[str] | None" default="None">
+  Component catalog identifiers the server supports. When set, only these catalogs are advertised to clients.
+</ParamField>
+
+<ParamField path="accept_inline_catalogs" type="bool" default="False">
+  Whether to accept inline catalog definitions from clients in addition to named catalogs.
+</ParamField>
+
+## Client Setup
+
+Add `A2UIClientExtension` to your `A2AClientConfig` to enable A2UI rendering:
+
+```python Code
+from crewai import Agent
+from crewai.a2a import A2AClientConfig
+from crewai.a2a.extensions.a2ui import A2UIClientExtension
+
+agent = Agent(
+    role="UI Coordinator",
+    goal="Coordinate tasks and render agent responses as rich UI",
+    backstory="Expert at presenting agent output in interactive formats",
+    llm="gpt-4o",
+    a2a=A2AClientConfig(
+        endpoint="https://dashboard-agent.example.com/.well-known/agent-card.json",
+        extensions=[A2UIClientExtension()],
+    ),
+)
+```
+
+### Client Extension Options
+
+<ParamField path="catalog_id" type="str | None" default="None">
+  Preferred component catalog identifier. Defaults to `"standard (v0.8)"` when not set.
+</ParamField>
+
+<ParamField path="allowed_components" type="list[str] | None" default="None">
+  Restrict which components the agent may use. When `None`, all 18 standard catalog components are available.
+</ParamField>
+
+## Message Types
+
+A2UI defines four server-to-client message types. Each message targets a **surface** identified by `surfaceId`.
+
+<Tabs>
+  <Tab title="beginRendering">
+  Initializes a new surface with a root component and optional styles.
+
+  ```json
+  {
+    "beginRendering": {
+      "surfaceId": "dashboard-1",
+      "root": "main-column",
+      "catalogId": "standard (v0.8)",
+      "styles": {
+        "primaryColor": "#EB6658"
+      }
+    }
+  }
+  ```
+  </Tab>
+
+  <Tab title="surfaceUpdate">
+  Sends or updates one or more components on an existing surface.
+
+  ```json
+  {
+    "surfaceUpdate": {
+      "surfaceId": "dashboard-1",
+      "components": [
+        {
+          "id": "main-column",
+          "component": {
+            "Column": {
+              "children": { "explicitList": ["title", "content"] },
+              "alignment": "start"
+            }
+          }
+        },
+        {
+          "id": "title",
+          "component": {
+            "Text": {
+              "text": { "literalString": "Dashboard" },
+              "usageHint": "h1"
+            }
+          }
+        }
+      ]
+    }
+  }
+  ```
+  </Tab>
+
+  <Tab title="dataModelUpdate">
+  Updates the data model bound to a surface, enabling dynamic content.
+
+  ```json
+  {
+    "dataModelUpdate": {
+      "surfaceId": "dashboard-1",
+      "path": "/data/model",
+      "contents": [
+        {
+          "key": "userName",
+          "valueString": "Alice"
+        },
+        {
+          "key": "score",
+          "valueNumber": 42
+        }
+      ]
+    }
+  }
+  ```
+  </Tab>
+
+  <Tab title="deleteSurface">
+  Removes a surface and all its components.
+
+  ```json
+  {
+    "deleteSurface": {
+      "surfaceId": "dashboard-1"
+    }
+  }
+  ```
+  </Tab>
+</Tabs>
+
+## Component Catalog
+
+A2UI ships with 18 standard components organized into three categories:
+
+### Content
+
+| Component | Description | Required Fields |
+|-----------|-------------|-----------------|
+| **Text** | Renders text with optional heading/body hints | `text` (StringBinding) |
+| **Image** | Displays an image with fit and size options | `url` (StringBinding) |
+| **Icon** | Renders a named icon from a set of 47 icons | `name` (IconBinding) |
+| **Video** | Embeds a video player | `url` (StringBinding) |
+| **AudioPlayer** | Embeds an audio player with optional description | `url` (StringBinding) |
+
+### Layout
+
+| Component | Description | Required Fields |
+|-----------|-------------|-----------------|
+| **Row** | Horizontal flex container | `children` (ChildrenDef) |
+| **Column** | Vertical flex container | `children` (ChildrenDef) |
+| **List** | Scrollable list (vertical or horizontal) | `children` (ChildrenDef) |
+| **Card** | Elevated container for a single child | `child` (str) |
+| **Tabs** | Tabbed container | `tabItems` (list of TabItem) |
+| **Divider** | Visual separator (horizontal or vertical) | — |
+| **Modal** | Overlay triggered by an entry point | `entryPointChild`, `contentChild` (str) |
+
+### Interactive
+
+| Component | Description | Required Fields |
+|-----------|-------------|-----------------|
+| **Button** | Clickable button that triggers an action | `child` (str), `action` (Action) |
+| **CheckBox** | Boolean toggle with a label | `label` (StringBinding), `value` (BooleanBinding) |
+| **TextField** | Text input with type and validation options | `label` (StringBinding) |
+| **DateTimeInput** | Date and/or time picker | `value` (StringBinding) |
+| **MultipleChoice** | Selection from a list of options | `selections` (ArrayBinding), `options` (list) |
+| **Slider** | Numeric range slider | `value` (NumberBinding) |
+
+## Data Binding
+
+Components reference values through **bindings** rather than raw literals. This allows surfaces to update dynamically when the data model changes.
+
+There are two ways to bind a value:
+
+- **Literal values** — hardcoded directly in the component definition
+- **Path references** — point to a key in the surface's data model
+
+```json
+{
+  "surfaceUpdate": {
+    "surfaceId": "profile-1",
+    "components": [
+      {
+        "id": "greeting",
+        "component": {
+          "Text": {
+            "text": { "path": "/data/model/userName" },
+            "usageHint": "h2"
+          }
+        }
+      },
+      {
+        "id": "status",
+        "component": {
+          "Text": {
+            "text": { "literalString": "Online" },
+            "usageHint": "caption"
+          }
+        }
+      }
+    ]
+  }
+}
+```
+
+In this example, `greeting` reads the user's name from the data model (updated via `dataModelUpdate`), while `status` uses a hardcoded literal.
+
+## Handling User Actions
+
+Interactive components like `Button` trigger `userAction` events that flow back to the server. Each action includes a `name`, the originating `surfaceId` and `sourceComponentId`, and an optional `context` with key-value pairs.
+
+```json
+{
+  "userAction": {
+    "name": "submitForm",
+    "surfaceId": "form-1",
+    "sourceComponentId": "submit-btn",
+    "timestamp": "2026-03-12T10:00:00Z",
+    "context": {
+      "selectedOption": "optionA"
+    }
+  }
+}
+```
+
+Action context values can also use path bindings to send current data model values back to the server:
+
+```json
+{
+  "Button": {
+    "child": "confirm-label",
+    "action": {
+      "name": "confirm",
+      "context": [
+        {
+          "key": "currentScore",
+          "value": { "path": "/data/model/score" }
+        }
+      ]
+    }
+  }
+}
+```
+
+## Validation
+
+Use `validate_a2ui_message` to validate server-to-client messages and `validate_a2ui_event` for client-to-server events:
+
+```python Code
+from crewai.a2a.extensions.a2ui import validate_a2ui_message
+from crewai.a2a.extensions.a2ui.validator import (
+    validate_a2ui_event,
+    A2UIValidationError,
+)
+
+# Validate a server message
+try:
+    msg = validate_a2ui_message({"beginRendering": {"surfaceId": "s1", "root": "r1"}})
+except A2UIValidationError as exc:
+    print(exc.errors)
+
+# Validate a client event
+try:
+    event = validate_a2ui_event({
+        "userAction": {
+            "name": "click",
+            "surfaceId": "s1",
+            "sourceComponentId": "btn-1",
+            "timestamp": "2026-03-12T10:00:00Z",
+        }
+    })
+except A2UIValidationError as exc:
+    print(exc.errors)
+```
+
+## Best Practices
+
+<CardGroup cols={2}>
+  <Card title="Start Simple" icon="play">
+    Begin with a `beginRendering` message and a single `surfaceUpdate`. Add data binding and interactivity once the basic flow works.
+  </Card>
+
+  <Card title="Use Data Binding for Dynamic Content" icon="arrows-rotate">
+    Prefer path bindings over literal values for content that changes. Use `dataModelUpdate` to push new values without resending the full component tree.
+  </Card>
+
+  <Card title="Filter Components" icon="filter">
+    Use the `allowed_components` option on `A2UIClientExtension` to restrict which components the agent may emit, reducing prompt size and keeping output predictable.
+  </Card>
+
+  <Card title="Validate Messages" icon="check">
+    Use `validate_a2ui_message` and `validate_a2ui_event` to catch malformed payloads early, especially when building custom integrations.
+  </Card>
+</CardGroup>
+
+## Learn More
+
+- [A2A Agent Delegation](/en/learn/a2a-agent-delegation) — configure agents for remote delegation via the A2A protocol
+- [A2A Protocol Documentation](https://a2a-protocol.org) — official protocol specification

lib/crewai-tools/src/crewai_tools/tools/code_interpreter_tool/README.md

@@ -1,27 +1,13 @@
 # CodeInterpreterTool
 
 ## Description
-This tool is used to give the Agent the ability to run code (Python3) from the code generated by the Agent itself. The code is executed in a Docker container for secure isolation.
+This tool is used to give the Agent the ability to run code (Python3) from the code generated by the Agent itself. The code is executed in a sandboxed environment, so it is safe to run any code.
 
-It is incredibly useful since it allows the Agent to generate code, run it in an isolated environment, get the result and use it to make decisions.
-
-## ⚠️ Security Requirements
-
-**Docker is REQUIRED** for safe code execution. The tool will refuse to execute code without Docker to prevent security vulnerabilities.
-
-### Why Docker is Required
-
-Previous versions included a "restricted sandbox" fallback when Docker was unavailable. This has been **removed** due to critical security vulnerabilities:
-
-- The Python-based sandbox could be escaped via object introspection
-- Attackers could recover the original `__import__` function and access any module
-- This allowed arbitrary command execution on the host system
-
-**Docker provides real process isolation** and is the only secure way to execute untrusted code.
+It is incredible useful since it allows the Agent to generate code, run it in the same environment, get the result and use it to make decisions.
 
 ## Requirements
 
-- **Docker (REQUIRED)** - Install from [docker.com](https://docs.docker.com/get-docker/)
+- Docker
 
 ## Installation
 Install the crewai_tools package
@@ -31,9 +17,7 @@ pip install 'crewai[tools]'
 
 ## Example
 
-Remember that when using this tool, the code must be generated by the Agent itself. The code must be Python3 code. It will take some time the first time to run because it needs to build the Docker image.
-
-### Basic Usage (Docker Container - Recommended)
+Remember that when using this tool, the code must be generated by the Agent itself. The code must be a Python3 code. And it will take some time for the first time to run because it needs to build the Docker image.
 
 ```python
 from crewai_tools import CodeInterpreterTool
@@ -44,9 +28,7 @@ Agent(
 )
 ```
 
-### Custom Dockerfile
-
-If you need to pass your own Dockerfile:
+Or if you need to pass your own Dockerfile just do this
 
 ```python
 from crewai_tools import CodeInterpreterTool
@@ -57,39 +39,15 @@ Agent(
 )
 ```
 
-### Manual Docker Host Configuration
-
-If it is difficult to connect to the Docker daemon automatically (especially for macOS users), you can set up the Docker host manually:
+If it is difficult to connect to docker daemon automatically (especially for macOS users), you can do this to setup docker host manually
 
 ```python 
 from crewai_tools import CodeInterpreterTool
 
 Agent(
     ...
-    tools=[CodeInterpreterTool(
-        user_docker_base_url="<Docker Host Base Url>",
-        user_dockerfile_path="<Dockerfile_path>"
-    )],
+    tools=[CodeInterpreterTool(user_docker_base_url="<Docker Host Base Url>",
+        user_dockerfile_path="<Dockerfile_path>")],
 )
+
 ```
-
-### Unsafe Mode (NOT RECOMMENDED)
-
-If you absolutely cannot use Docker and **fully trust the code source**, you can use unsafe mode:
-
-```python
-from crewai_tools import CodeInterpreterTool
-
-# WARNING: Only use with fully trusted code!
-Agent(
-    ...
-    tools=[CodeInterpreterTool(unsafe_mode=True)],
-)
-```
-
-**⚠️ SECURITY WARNING:** `unsafe_mode=True` executes code directly on the host without any isolation. Only use this if:
-- You completely trust the code being executed
-- You understand the security risks
-- You cannot install Docker in your environment
-
-For production use, **always use Docker** (the default mode).

lib/crewai-tools/src/crewai_tools/tools/code_interpreter_tool/code_interpreter_tool.py

@@ -50,16 +50,11 @@ class CodeInterpreterSchema(BaseModel):
 
 
 class SandboxPython:
-    """INSECURE: A restricted Python execution environment with known vulnerabilities.
+    """A restricted Python execution environment for running code safely.
 
-    WARNING: This class does NOT provide real security isolation and is vulnerable to
-    sandbox escape attacks via Python object introspection. Attackers can recover the
-    original __import__ function and bypass all restrictions.
-
-    DO NOT USE for untrusted code execution. Use Docker containers instead.
-
-    This class attempts to restrict access to dangerous modules and built-in functions
-    but provides no real security boundary against a motivated attacker.
+    This class provides methods to safely execute Python code by restricting access to
+    potentially dangerous modules and built-in functions. It creates a sandboxed
+    environment where harmful operations are blocked.
     """
 
     BLOCKED_MODULES: ClassVar[set[str]] = {
@@ -304,8 +299,8 @@ class CodeInterpreterTool(BaseTool):
     def run_code_safety(self, code: str, libraries_used: list[str]) -> str:
         """Runs code in the safest available environment.
 
-        Requires Docker to be available for secure code execution. Fails closed
-        if Docker is not available to prevent sandbox escape vulnerabilities.
+        Attempts to run code in Docker if available, falls back to a restricted
+        sandbox if Docker is not available.
 
         Args:
             code: The Python code to execute as a string.
@@ -313,24 +308,10 @@ class CodeInterpreterTool(BaseTool):
 
         Returns:
             The output of the executed code as a string.
-
-        Raises:
-            RuntimeError: If Docker is not available, as the restricted sandbox
-                         is vulnerable to escape attacks and should not be used
-                         for untrusted code execution.
         """
         if self._check_docker_available():
             return self.run_code_in_docker(code, libraries_used)
-        
-        error_msg = (
-            "Docker is required for safe code execution but is not available. "
-            "The restricted sandbox fallback has been removed due to security vulnerabilities "
-            "that allow sandbox escape via Python object introspection. "
-            "Please install Docker (https://docs.docker.com/get-docker/) or use unsafe_mode=True "
-            "if you trust the code source and understand the security risks."
-        )
-        Printer.print(error_msg, color="bold_red")
-        raise RuntimeError(error_msg)
+        return self.run_code_in_restricted_sandbox(code)
 
     def run_code_in_docker(self, code: str, libraries_used: list[str]) -> str:
         """Runs Python code in a Docker container for safe isolation.
@@ -361,19 +342,10 @@ class CodeInterpreterTool(BaseTool):
 
     @staticmethod
     def run_code_in_restricted_sandbox(code: str) -> str:
-        """DEPRECATED AND INSECURE: Runs Python code in a restricted sandbox environment.
+        """Runs Python code in a restricted sandbox environment.
 
-        WARNING: This method is vulnerable to sandbox escape attacks via Python object
-        introspection and should NOT be used for untrusted code execution. It has been
-        deprecated and is only kept for backward compatibility with trusted code.
-
-        The "restricted" environment can be bypassed by attackers who can:
-        - Use object graph introspection to recover the original __import__ function
-        - Access any Python module including os, subprocess, sys, etc.
-        - Execute arbitrary commands on the host system
-
-        Use run_code_in_docker() for secure code execution, or run_code_unsafe()
-        if you explicitly acknowledge the security risks.
+        Executes the code with restricted access to potentially dangerous modules and
+        built-in functions for basic safety when Docker is not available.
 
         Args:
             code: The Python code to execute as a string.
@@ -382,10 +354,7 @@ class CodeInterpreterTool(BaseTool):
             The value of the 'result' variable from the executed code,
             or an error message if execution failed.
         """
-        Printer.print(
-            "WARNING: Running code in INSECURE restricted sandbox (vulnerable to escape attacks)",
-            color="bold_red"
-        )
+        Printer.print("Running code in restricted sandbox", color="yellow")
         exec_locals: dict[str, Any] = {}
         try:
             SandboxPython.exec(code=code, locals_=exec_locals)

lib/crewai-tools/tests/tools/test_code_interpreter_tool.py

@@ -76,22 +76,24 @@ print("This is line 2")"""
     )
 
 
-def test_docker_unavailable_raises_error(printer_mock, docker_unavailable_mock):
-    """Test that execution fails when Docker is unavailable in safe mode."""
+def test_restricted_sandbox_basic_code_execution(printer_mock, docker_unavailable_mock):
+    """Test basic code execution."""
     tool = CodeInterpreterTool()
     code = """
 result = 2 + 2
 print(result)
 """
-    with pytest.raises(RuntimeError) as exc_info:
-        tool.run(code=code, libraries_used=[])
-    
-    assert "Docker is required for safe code execution" in str(exc_info.value)
-    assert "sandbox escape" in str(exc_info.value)
+    result = tool.run(code=code, libraries_used=[])
+    printer_mock.assert_called_with(
+        "Running code in restricted sandbox", color="yellow"
+    )
+    assert result == 4
 
 
-def test_restricted_sandbox_running_with_blocked_modules():
-    """Test that restricted modules cannot be imported when using the deprecated sandbox directly."""
+def test_restricted_sandbox_running_with_blocked_modules(
+    printer_mock, docker_unavailable_mock
+):
+    """Test that restricted modules cannot be imported."""
     tool = CodeInterpreterTool()
     restricted_modules = SandboxPython.BLOCKED_MODULES
 
@@ -100,15 +102,18 @@ def test_restricted_sandbox_running_with_blocked_modules():
 import {module}
 result = "Import succeeded"
 """
-        # Note: run_code_in_restricted_sandbox is deprecated and insecure
-        # This test verifies the old behavior but should not be used in production
-        result = tool.run_code_in_restricted_sandbox(code)
-        
+        result = tool.run(code=code, libraries_used=[])
+        printer_mock.assert_called_with(
+            "Running code in restricted sandbox", color="yellow"
+        )
+
         assert f"An error occurred: Importing '{module}' is not allowed" in result
 
 
-def test_restricted_sandbox_running_with_blocked_builtins():
-    """Test that restricted builtins are not available when using the deprecated sandbox directly."""
+def test_restricted_sandbox_running_with_blocked_builtins(
+    printer_mock, docker_unavailable_mock
+):
+    """Test that restricted builtins are not available."""
     tool = CodeInterpreterTool()
     restricted_builtins = SandboxPython.UNSAFE_BUILTINS
 
@@ -117,23 +122,25 @@ def test_restricted_sandbox_running_with_blocked_builtins():
 {builtin}("test")
 result = "Builtin available"
 """
-        # Note: run_code_in_restricted_sandbox is deprecated and insecure
-        # This test verifies the old behavior but should not be used in production
-        result = tool.run_code_in_restricted_sandbox(code)
+        result = tool.run(code=code, libraries_used=[])
+        printer_mock.assert_called_with(
+            "Running code in restricted sandbox", color="yellow"
+        )
         assert f"An error occurred: name '{builtin}' is not defined" in result
 
 
 def test_restricted_sandbox_running_with_no_result_variable(
     printer_mock, docker_unavailable_mock
 ):
-    """Test behavior when no result variable is set in deprecated sandbox."""
+    """Test behavior when no result variable is set."""
     tool = CodeInterpreterTool()
     code = """
 x = 10
 """
-    # Note: run_code_in_restricted_sandbox is deprecated and insecure
-    # This test verifies the old behavior but should not be used in production
-    result = tool.run_code_in_restricted_sandbox(code)
+    result = tool.run(code=code, libraries_used=[])
+    printer_mock.assert_called_with(
+        "Running code in restricted sandbox", color="yellow"
+    )
     assert result == "No result variable found."
 
 
@@ -165,50 +172,3 @@ result = eval("5/1")
         "WARNING: Running code in unsafe mode", color="bold_magenta"
     )
     assert 5.0 == result
-
-
-@pytest.mark.xfail(
-    reason=(
-        "run_code_in_restricted_sandbox is known to be vulnerable to sandbox "
-        "escape via object introspection. This test encodes the desired secure "
-        "behavior (no escape possible) and will start passing once the "
-        "vulnerability is fixed or the function is removed."
-    )
-)
-def test_sandbox_escape_vulnerability_demonstration(printer_mock):
-    """Demonstrate that the restricted sandbox is vulnerable to escape attacks.
-    
-    This test shows that an attacker can use Python object introspection to bypass
-    the restricted sandbox and access blocked modules like 'os'. This is why the
-    sandbox should never be used for untrusted code execution.
-    
-    NOTE: This test uses the deprecated run_code_in_restricted_sandbox directly
-    to demonstrate the vulnerability. In production, Docker is now required.
-    """
-    tool = CodeInterpreterTool()
-    
-    # Classic Python sandbox escape via object introspection
-    escape_code = """
-# Recover the real __import__ function via object introspection
-for cls in ().__class__.__bases__[0].__subclasses__():
-    if cls.__name__ == 'catch_warnings':
-        # Get the real builtins module
-        real_builtins = cls()._module.__builtins__
-        real_import = real_builtins['__import__']
-        # Now we can import os and execute commands
-        os = real_import('os')
-        # Demonstrate we have escaped the sandbox
-        result = "SANDBOX_ESCAPED" if hasattr(os, 'system') else "FAILED"
-        break
-"""
-    
-    # The deprecated sandbox is vulnerable to this attack
-    result = tool.run_code_in_restricted_sandbox(escape_code)
-    
-    # Desired behavior: the restricted sandbox should prevent this escape.
-    # If this assertion fails, run_code_in_restricted_sandbox remains vulnerable.
-    assert result != "SANDBOX_ESCAPED", (
-        "The restricted sandbox was bypassed via object introspection. "
-        "This indicates run_code_in_restricted_sandbox is still vulnerable and "
-        "is why Docker is now required for safe code execution."
-    )

lib/crewai/src/crewai/a2a/extensions/a2ui/__init__.py

@@ -0,0 +1,68 @@
+"""A2UI (Agent to UI) declarative UI protocol support for CrewAI."""
+
+from crewai.a2a.extensions.a2ui.catalog import (
+    AudioPlayer,
+    Button,
+    Card,
+    CheckBox,
+    Column,
+    DateTimeInput,
+    Divider,
+    Icon,
+    Image,
+    List,
+    Modal,
+    MultipleChoice,
+    Row,
+    Slider,
+    Tabs,
+    Text,
+    TextField,
+    Video,
+)
+from crewai.a2a.extensions.a2ui.client_extension import A2UIClientExtension
+from crewai.a2a.extensions.a2ui.models import (
+    A2UIEvent,
+    A2UIMessage,
+    A2UIResponse,
+    BeginRendering,
+    DataModelUpdate,
+    DeleteSurface,
+    SurfaceUpdate,
+    UserAction,
+)
+from crewai.a2a.extensions.a2ui.server_extension import A2UIServerExtension
+from crewai.a2a.extensions.a2ui.validator import validate_a2ui_message
+
+
+__all__ = [
+    "A2UIClientExtension",
+    "A2UIEvent",
+    "A2UIMessage",
+    "A2UIResponse",
+    "A2UIServerExtension",
+    "AudioPlayer",
+    "BeginRendering",
+    "Button",
+    "Card",
+    "CheckBox",
+    "Column",
+    "DataModelUpdate",
+    "DateTimeInput",
+    "DeleteSurface",
+    "Divider",
+    "Icon",
+    "Image",
+    "List",
+    "Modal",
+    "MultipleChoice",
+    "Row",
+    "Slider",
+    "SurfaceUpdate",
+    "Tabs",
+    "Text",
+    "TextField",
+    "UserAction",
+    "Video",
+    "validate_a2ui_message",
+]

lib/crewai/src/crewai/a2a/extensions/a2ui/catalog.py

@@ -0,0 +1,467 @@
+"""Typed helpers for A2UI standard catalog components.
+
+These models provide optional type safety for standard catalog components.
+Agents can also use raw dicts validated against the JSON schema.
+"""
+
+from __future__ import annotations
+
+from typing import Literal
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class StringBinding(BaseModel):
+    """A string value: literal or data-model path."""
+
+    literal_string: str | None = Field(
+        default=None, alias="literalString", description="Literal string value."
+    )
+    path: str | None = Field(default=None, description="Data-model path reference.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class NumberBinding(BaseModel):
+    """A numeric value: literal or data-model path."""
+
+    literal_number: float | None = Field(
+        default=None, alias="literalNumber", description="Literal numeric value."
+    )
+    path: str | None = Field(default=None, description="Data-model path reference.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class BooleanBinding(BaseModel):
+    """A boolean value: literal or data-model path."""
+
+    literal_boolean: bool | None = Field(
+        default=None, alias="literalBoolean", description="Literal boolean value."
+    )
+    path: str | None = Field(default=None, description="Data-model path reference.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class ArrayBinding(BaseModel):
+    """An array value: literal or data-model path."""
+
+    literal_array: list[str] | None = Field(
+        default=None, alias="literalArray", description="Literal array of strings."
+    )
+    path: str | None = Field(default=None, description="Data-model path reference.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class ChildrenDef(BaseModel):
+    """Children definition for layout components."""
+
+    explicit_list: list[str] | None = Field(
+        default=None,
+        alias="explicitList",
+        description="Explicit list of child component IDs.",
+    )
+    template: ChildTemplate | None = Field(
+        default=None, description="Template for generating dynamic children."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class ChildTemplate(BaseModel):
+    """Template for generating dynamic children from a data model list."""
+
+    component_id: str = Field(
+        alias="componentId", description="ID of the component to repeat."
+    )
+    data_binding: str = Field(
+        alias="dataBinding", description="Data-model path to bind the template to."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class ActionContextEntry(BaseModel):
+    """A key-value pair in an action context payload."""
+
+    key: str = Field(description="Context entry key.")
+    value: ActionBoundValue = Field(description="Context entry value.")
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class ActionBoundValue(BaseModel):
+    """A value in an action context: literal or data-model path."""
+
+    path: str | None = Field(default=None, description="Data-model path reference.")
+    literal_string: str | None = Field(
+        default=None, alias="literalString", description="Literal string value."
+    )
+    literal_number: float | None = Field(
+        default=None, alias="literalNumber", description="Literal numeric value."
+    )
+    literal_boolean: bool | None = Field(
+        default=None, alias="literalBoolean", description="Literal boolean value."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class Action(BaseModel):
+    """Client-side action dispatched by interactive components."""
+
+    name: str = Field(description="Action name dispatched on interaction.")
+    context: list[ActionContextEntry] | None = Field(
+        default=None, description="Key-value pairs sent with the action."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class TabItem(BaseModel):
+    """A single tab definition."""
+
+    title: StringBinding = Field(description="Tab title text.")
+    child: str = Field(description="Component ID rendered as the tab content.")
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class MultipleChoiceOption(BaseModel):
+    """A single option in a MultipleChoice component."""
+
+    label: StringBinding = Field(description="Display label for the option.")
+    value: str = Field(description="Value submitted when the option is selected.")
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class Text(BaseModel):
+    """Displays text content."""
+
+    text: StringBinding = Field(description="Text content to display.")
+    usage_hint: Literal["h1", "h2", "h3", "h4", "h5", "caption", "body"] | None = Field(
+        default=None, alias="usageHint", description="Semantic hint for text styling."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class Image(BaseModel):
+    """Displays an image."""
+
+    url: StringBinding = Field(description="Image source URL.")
+    fit: Literal["contain", "cover", "fill", "none", "scale-down"] | None = Field(
+        default=None, description="Object-fit behavior for the image."
+    )
+    usage_hint: (
+        Literal[
+            "icon", "avatar", "smallFeature", "mediumFeature", "largeFeature", "header"
+        ]
+        | None
+    ) = Field(
+        default=None, alias="usageHint", description="Semantic hint for image sizing."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+IconName = Literal[
+    "accountCircle",
+    "add",
+    "arrowBack",
+    "arrowForward",
+    "attachFile",
+    "calendarToday",
+    "call",
+    "camera",
+    "check",
+    "close",
+    "delete",
+    "download",
+    "edit",
+    "event",
+    "error",
+    "favorite",
+    "favoriteOff",
+    "folder",
+    "help",
+    "home",
+    "info",
+    "locationOn",
+    "lock",
+    "lockOpen",
+    "mail",
+    "menu",
+    "moreVert",
+    "moreHoriz",
+    "notificationsOff",
+    "notifications",
+    "payment",
+    "person",
+    "phone",
+    "photo",
+    "print",
+    "refresh",
+    "search",
+    "send",
+    "settings",
+    "share",
+    "shoppingCart",
+    "star",
+    "starHalf",
+    "starOff",
+    "upload",
+    "visibility",
+    "visibilityOff",
+    "warning",
+]
+
+
+class IconBinding(BaseModel):
+    """Icon name: literal enum or data-model path."""
+
+    literal_string: IconName | None = Field(
+        default=None, alias="literalString", description="Literal icon name."
+    )
+    path: str | None = Field(default=None, description="Data-model path reference.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class Icon(BaseModel):
+    """Displays a named icon."""
+
+    name: IconBinding = Field(description="Icon name binding.")
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class Video(BaseModel):
+    """Displays a video player."""
+
+    url: StringBinding = Field(description="Video source URL.")
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class AudioPlayer(BaseModel):
+    """Displays an audio player."""
+
+    url: StringBinding = Field(description="Audio source URL.")
+    description: StringBinding | None = Field(
+        default=None, description="Accessible description of the audio content."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class Row(BaseModel):
+    """Horizontal layout container."""
+
+    children: ChildrenDef = Field(description="Child components in this row.")
+    distribution: (
+        Literal["center", "end", "spaceAround", "spaceBetween", "spaceEvenly", "start"]
+        | None
+    ) = Field(
+        default=None, description="How children are distributed along the main axis."
+    )
+    alignment: Literal["start", "center", "end", "stretch"] | None = Field(
+        default=None, description="How children are aligned on the cross axis."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class Column(BaseModel):
+    """Vertical layout container."""
+
+    children: ChildrenDef = Field(description="Child components in this column.")
+    distribution: (
+        Literal["start", "center", "end", "spaceBetween", "spaceAround", "spaceEvenly"]
+        | None
+    ) = Field(
+        default=None, description="How children are distributed along the main axis."
+    )
+    alignment: Literal["center", "end", "start", "stretch"] | None = Field(
+        default=None, description="How children are aligned on the cross axis."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class List(BaseModel):
+    """Scrollable list container."""
+
+    children: ChildrenDef = Field(description="Child components in this list.")
+    direction: Literal["vertical", "horizontal"] | None = Field(
+        default=None, description="Scroll direction of the list."
+    )
+    alignment: Literal["start", "center", "end", "stretch"] | None = Field(
+        default=None, description="How children are aligned on the cross axis."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class Card(BaseModel):
+    """Card container wrapping a single child."""
+
+    child: str = Field(description="Component ID of the card content.")
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class Tabs(BaseModel):
+    """Tabbed navigation container."""
+
+    tab_items: list[TabItem] = Field(
+        alias="tabItems", description="List of tab definitions."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class Divider(BaseModel):
+    """A visual divider line."""
+
+    axis: Literal["horizontal", "vertical"] | None = Field(
+        default=None, description="Orientation of the divider."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class Modal(BaseModel):
+    """A modal dialog with an entry point trigger and content."""
+
+    entry_point_child: str = Field(
+        alias="entryPointChild", description="Component ID that triggers the modal."
+    )
+    content_child: str = Field(
+        alias="contentChild", description="Component ID rendered inside the modal."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class Button(BaseModel):
+    """An interactive button with an action."""
+
+    child: str = Field(description="Component ID of the button label.")
+    primary: bool | None = Field(
+        default=None, description="Whether the button uses primary styling."
+    )
+    action: Action = Field(description="Action dispatched when the button is clicked.")
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class CheckBox(BaseModel):
+    """A checkbox input."""
+
+    label: StringBinding = Field(description="Label text for the checkbox.")
+    value: BooleanBinding = Field(
+        description="Boolean value binding for the checkbox state."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class TextField(BaseModel):
+    """A text input field."""
+
+    label: StringBinding = Field(description="Label text for the input.")
+    text: StringBinding | None = Field(
+        default=None, description="Current text value binding."
+    )
+    text_field_type: (
+        Literal["date", "longText", "number", "shortText", "obscured"] | None
+    ) = Field(default=None, alias="textFieldType", description="Input type variant.")
+    validation_regexp: str | None = Field(
+        default=None,
+        alias="validationRegexp",
+        description="Regex pattern for client-side validation.",
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class DateTimeInput(BaseModel):
+    """A date and/or time picker."""
+
+    value: StringBinding = Field(description="ISO date/time string value binding.")
+    enable_date: bool | None = Field(
+        default=None,
+        alias="enableDate",
+        description="Whether the date picker is enabled.",
+    )
+    enable_time: bool | None = Field(
+        default=None,
+        alias="enableTime",
+        description="Whether the time picker is enabled.",
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class MultipleChoice(BaseModel):
+    """A multiple-choice selection component."""
+
+    selections: ArrayBinding = Field(description="Array binding for selected values.")
+    options: list[MultipleChoiceOption] = Field(description="Available choices.")
+    max_allowed_selections: int | None = Field(
+        default=None,
+        alias="maxAllowedSelections",
+        description="Maximum number of selections allowed.",
+    )
+    variant: Literal["checkbox", "chips"] | None = Field(
+        default=None, description="Visual variant for the selection UI."
+    )
+    filterable: bool | None = Field(
+        default=None, description="Whether options can be filtered by typing."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class Slider(BaseModel):
+    """A numeric slider input."""
+
+    value: NumberBinding = Field(
+        description="Numeric value binding for the slider position."
+    )
+    min_value: float | None = Field(
+        default=None, alias="minValue", description="Minimum slider value."
+    )
+    max_value: float | None = Field(
+        default=None, alias="maxValue", description="Maximum slider value."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+STANDARD_CATALOG_COMPONENTS: frozenset[str] = frozenset(
+    {
+        "Text",
+        "Image",
+        "Icon",
+        "Video",
+        "AudioPlayer",
+        "Row",
+        "Column",
+        "List",
+        "Card",
+        "Tabs",
+        "Divider",
+        "Modal",
+        "Button",
+        "CheckBox",
+        "TextField",
+        "DateTimeInput",
+        "MultipleChoice",
+        "Slider",
+    }
+)

lib/crewai/src/crewai/a2a/extensions/a2ui/client_extension.py

@@ -0,0 +1,285 @@
+"""A2UI client extension for the A2A protocol."""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+import logging
+from typing import TYPE_CHECKING, Any, cast
+
+from pydantic import Field
+from pydantic.dataclasses import dataclass
+from typing_extensions import TypedDict
+
+from crewai.a2a.extensions.a2ui.models import extract_a2ui_json_objects
+from crewai.a2a.extensions.a2ui.prompt import build_a2ui_system_prompt
+from crewai.a2a.extensions.a2ui.server_extension import A2UI_MIME_TYPE
+from crewai.a2a.extensions.a2ui.validator import (
+    A2UIValidationError,
+    validate_a2ui_message,
+)
+
+
+if TYPE_CHECKING:
+    from a2a.types import Message
+
+    from crewai.agent.core import Agent
+
+
+logger = logging.getLogger(__name__)
+
+
+class StylesDict(TypedDict, total=False):
+    """Serialized surface styling."""
+
+    font: str
+    primaryColor: str
+
+
+class ComponentEntryDict(TypedDict, total=False):
+    """Serialized component entry in a surface update."""
+
+    id: str
+    weight: float
+    component: dict[str, Any]
+
+
+class BeginRenderingDict(TypedDict, total=False):
+    """Serialized beginRendering payload."""
+
+    surfaceId: str
+    root: str
+    catalogId: str
+    styles: StylesDict
+
+
+class SurfaceUpdateDict(TypedDict, total=False):
+    """Serialized surfaceUpdate payload."""
+
+    surfaceId: str
+    components: list[ComponentEntryDict]
+
+
+class DataEntryDict(TypedDict, total=False):
+    """Serialized data model entry."""
+
+    key: str
+    valueString: str
+    valueNumber: float
+    valueBoolean: bool
+    valueMap: list[DataEntryDict]
+
+
+class DataModelUpdateDict(TypedDict, total=False):
+    """Serialized dataModelUpdate payload."""
+
+    surfaceId: str
+    path: str
+    contents: list[DataEntryDict]
+
+
+class DeleteSurfaceDict(TypedDict):
+    """Serialized deleteSurface payload."""
+
+    surfaceId: str
+
+
+class A2UIMessageDict(TypedDict, total=False):
+    """Serialized A2UI server-to-client message with exactly one key set."""
+
+    beginRendering: BeginRenderingDict
+    surfaceUpdate: SurfaceUpdateDict
+    dataModelUpdate: DataModelUpdateDict
+    deleteSurface: DeleteSurfaceDict
+
+
+@dataclass
+class A2UIConversationState:
+    """Tracks active A2UI surfaces and data models across a conversation."""
+
+    active_surfaces: dict[str, dict[str, Any]] = Field(default_factory=dict)
+    data_models: dict[str, list[dict[str, Any]]] = Field(default_factory=dict)
+    last_a2ui_messages: list[A2UIMessageDict] = Field(default_factory=list)
+
+    def is_ready(self) -> bool:
+        """Return True when at least one surface is active."""
+        return bool(self.active_surfaces)
+
+
+class A2UIClientExtension:
+    """A2A client extension that adds A2UI support to agents.
+
+    Implements the ``A2AExtension`` protocol to inject A2UI prompt
+    instructions, track UI state across conversations, and validate
+    A2UI messages in responses.
+
+    Example::
+
+        A2AClientConfig(
+            endpoint="...",
+            extensions=["https://a2ui.org/a2a-extension/a2ui/v0.8"],
+            client_extensions=[A2UIClientExtension()],
+        )
+    """
+
+    def __init__(
+        self,
+        catalog_id: str | None = None,
+        allowed_components: list[str] | None = None,
+    ) -> None:
+        """Initialize the A2UI client extension.
+
+        Args:
+            catalog_id: Catalog identifier to use for prompt generation.
+            allowed_components: Subset of component names to expose to the agent.
+        """
+        self._catalog_id = catalog_id
+        self._allowed_components = allowed_components
+
+    def inject_tools(self, agent: Agent) -> None:
+        """No-op — A2UI uses prompt augmentation rather than tool injection."""
+
+    def extract_state_from_history(
+        self, conversation_history: Sequence[Message]
+    ) -> A2UIConversationState | None:
+        """Scan conversation history for A2UI DataParts and track surface state.
+
+        When ``catalog_id`` is set, only surfaces matching that catalog are tracked.
+        """
+        state = A2UIConversationState()
+
+        for message in conversation_history:
+            for part in message.parts:
+                root = part.root
+                if root.kind != "data":
+                    continue
+                metadata = root.metadata or {}
+                mime_type = metadata.get("mimeType", "")
+                if mime_type != A2UI_MIME_TYPE:
+                    continue
+
+                data = root.data
+                if not isinstance(data, dict):
+                    continue
+
+                surface_id = _get_surface_id(data)
+                if not surface_id:
+                    continue
+
+                if self._catalog_id and "beginRendering" in data:
+                    catalog_id = data["beginRendering"].get("catalogId")
+                    if catalog_id and catalog_id != self._catalog_id:
+                        continue
+
+                if "deleteSurface" in data:
+                    state.active_surfaces.pop(surface_id, None)
+                    state.data_models.pop(surface_id, None)
+                elif "beginRendering" in data:
+                    state.active_surfaces[surface_id] = data["beginRendering"]
+                elif "surfaceUpdate" in data:
+                    state.active_surfaces[surface_id] = data["surfaceUpdate"]
+                elif "dataModelUpdate" in data:
+                    contents = data["dataModelUpdate"].get("contents", [])
+                    state.data_models.setdefault(surface_id, []).extend(contents)
+
+        if not state.active_surfaces and not state.data_models:
+            return None
+        return state
+
+    def augment_prompt(
+        self,
+        base_prompt: str,
+        _conversation_state: A2UIConversationState | None,
+    ) -> str:
+        """Append A2UI system prompt instructions to the base prompt."""
+        a2ui_prompt = build_a2ui_system_prompt(
+            catalog_id=self._catalog_id,
+            allowed_components=self._allowed_components,
+        )
+        return f"{base_prompt}\n\n{a2ui_prompt}"
+
+    def process_response(
+        self,
+        agent_response: Any,
+        conversation_state: A2UIConversationState | None,
+    ) -> Any:
+        """Extract and validate A2UI JSON from agent output.
+
+        When ``allowed_components`` is set, components not in the allowlist are
+        logged and stripped from surface updates.  Stores extracted A2UI messages
+        on the conversation state and returns the original response unchanged.
+        """
+        text = (
+            agent_response if isinstance(agent_response, str) else str(agent_response)
+        )
+        a2ui_messages = _extract_and_validate(text)
+
+        if self._allowed_components:
+            allowed = set(self._allowed_components)
+            a2ui_messages = [_filter_components(msg, allowed) for msg in a2ui_messages]
+
+        if a2ui_messages and conversation_state is not None:
+            conversation_state.last_a2ui_messages = a2ui_messages
+
+        return agent_response
+
+
+def _get_surface_id(data: dict[str, Any]) -> str | None:
+    """Extract surfaceId from any A2UI message type."""
+    for key in ("beginRendering", "surfaceUpdate", "dataModelUpdate", "deleteSurface"):
+        inner = data.get(key)
+        if isinstance(inner, dict):
+            sid = inner.get("surfaceId")
+            if isinstance(sid, str):
+                return sid
+    return None
+
+
+def _filter_components(msg: A2UIMessageDict, allowed: set[str]) -> A2UIMessageDict:
+    """Strip components whose type is not in *allowed* from a surfaceUpdate."""
+    surface_update = msg.get("surfaceUpdate")
+    if not isinstance(surface_update, dict):
+        return msg
+
+    components = surface_update.get("components")
+    if not isinstance(components, list):
+        return msg
+
+    filtered = []
+    for entry in components:
+        component = entry.get("component", {})
+        component_types = set(component.keys())
+        disallowed = component_types - allowed
+        if disallowed:
+            logger.debug(
+                "Stripping disallowed component type(s) %s from surface update",
+                disallowed,
+            )
+            continue
+        filtered.append(entry)
+
+    if len(filtered) == len(components):
+        return msg
+
+    return {**msg, "surfaceUpdate": {**surface_update, "components": filtered}}
+
+
+def _extract_and_validate(text: str) -> list[A2UIMessageDict]:
+    """Extract A2UI JSON objects from text and validate them."""
+    return [
+        dumped
+        for candidate in extract_a2ui_json_objects(text)
+        if (dumped := _try_validate(candidate)) is not None
+    ]
+
+
+def _try_validate(candidate: dict[str, Any]) -> A2UIMessageDict | None:
+    """Validate a single A2UI candidate, returning None on failure."""
+    try:
+        msg = validate_a2ui_message(candidate)
+    except A2UIValidationError:
+        logger.debug(
+            "Skipping invalid A2UI candidate in agent output",
+            exc_info=True,
+        )
+        return None
+    return cast(A2UIMessageDict, msg.model_dump(by_alias=True, exclude_none=True))

lib/crewai/src/crewai/a2a/extensions/a2ui/models.py

@@ -0,0 +1,281 @@
+"""Pydantic models for A2UI server-to-client messages and client-to-server events."""
+
+from __future__ import annotations
+
+import json
+import re
+from typing import Any
+
+from pydantic import BaseModel, ConfigDict, Field, model_validator
+
+
+class BoundValue(BaseModel):
+    """A value that can be a literal or a data-model path reference."""
+
+    literal_string: str | None = Field(
+        default=None, alias="literalString", description="Literal string value."
+    )
+    literal_number: float | None = Field(
+        default=None, alias="literalNumber", description="Literal numeric value."
+    )
+    literal_boolean: bool | None = Field(
+        default=None, alias="literalBoolean", description="Literal boolean value."
+    )
+    literal_array: list[str] | None = Field(
+        default=None, alias="literalArray", description="Literal array of strings."
+    )
+    path: str | None = Field(default=None, description="Data-model path reference.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class MapEntry(BaseModel):
+    """A single entry in a valueMap adjacency list, supporting recursive nesting."""
+
+    key: str = Field(description="Entry key.")
+    value_string: str | None = Field(
+        default=None, alias="valueString", description="String value."
+    )
+    value_number: float | None = Field(
+        default=None, alias="valueNumber", description="Numeric value."
+    )
+    value_boolean: bool | None = Field(
+        default=None, alias="valueBoolean", description="Boolean value."
+    )
+    value_map: list[MapEntry] | None = Field(
+        default=None, alias="valueMap", description="Nested map entries."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class DataEntry(BaseModel):
+    """A data model entry with a key and exactly one typed value."""
+
+    key: str = Field(description="Entry key.")
+    value_string: str | None = Field(
+        default=None, alias="valueString", description="String value."
+    )
+    value_number: float | None = Field(
+        default=None, alias="valueNumber", description="Numeric value."
+    )
+    value_boolean: bool | None = Field(
+        default=None, alias="valueBoolean", description="Boolean value."
+    )
+    value_map: list[MapEntry] | None = Field(
+        default=None, alias="valueMap", description="Nested map entries."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+_HEX_COLOR_PATTERN: re.Pattern[str] = re.compile(r"^#[0-9a-fA-F]{6}$")
+
+
+class Styles(BaseModel):
+    """Surface styling information."""
+
+    font: str | None = Field(default=None, description="Font family name.")
+    primary_color: str | None = Field(
+        default=None,
+        alias="primaryColor",
+        pattern=_HEX_COLOR_PATTERN.pattern,
+        description="Primary color as a hex string.",
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")
+
+
+class ComponentEntry(BaseModel):
+    """A single component in a UI widget tree.
+
+    The ``component`` dict must contain exactly one key — the component type
+    name (e.g. ``"Text"``, ``"Button"``) — whose value holds the component
+    properties.  Component internals are left as ``dict[str, Any]`` because
+    they are catalog-dependent; use the typed helpers in ``catalog.py`` for
+    the standard catalog.
+    """
+
+    id: str = Field(description="Unique component identifier.")
+    weight: float | None = Field(
+        default=None, description="Flex weight for layout distribution."
+    )
+    component: dict[str, Any] = Field(
+        description="Component type name mapped to its properties."
+    )
+
+    model_config = ConfigDict(extra="forbid")
+
+
+class BeginRendering(BaseModel):
+    """Signals the client to begin rendering a surface."""
+
+    surface_id: str = Field(alias="surfaceId", description="Unique surface identifier.")
+    root: str = Field(description="Component ID of the root element.")
+    catalog_id: str | None = Field(
+        default=None,
+        alias="catalogId",
+        description="Catalog identifier for the surface.",
+    )
+    styles: Styles | None = Field(
+        default=None, description="Surface styling overrides."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class SurfaceUpdate(BaseModel):
+    """Updates a surface with a new set of components."""
+
+    surface_id: str = Field(alias="surfaceId", description="Target surface identifier.")
+    components: list[ComponentEntry] = Field(
+        min_length=1, description="Components to render on the surface."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class DataModelUpdate(BaseModel):
+    """Updates the data model for a surface."""
+
+    surface_id: str = Field(alias="surfaceId", description="Target surface identifier.")
+    path: str | None = Field(
+        default=None, description="Data-model path prefix for the update."
+    )
+    contents: list[DataEntry] = Field(
+        description="Data entries to merge into the model."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class DeleteSurface(BaseModel):
+    """Signals the client to delete a surface."""
+
+    surface_id: str = Field(
+        alias="surfaceId", description="Surface identifier to delete."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+
+class A2UIMessage(BaseModel):
+    """Union wrapper for the four server-to-client A2UI message types.
+
+    Exactly one of the fields must be set.
+    """
+
+    begin_rendering: BeginRendering | None = Field(
+        default=None,
+        alias="beginRendering",
+        description="Begin rendering a new surface.",
+    )
+    surface_update: SurfaceUpdate | None = Field(
+        default=None,
+        alias="surfaceUpdate",
+        description="Update components on a surface.",
+    )
+    data_model_update: DataModelUpdate | None = Field(
+        default=None,
+        alias="dataModelUpdate",
+        description="Update the surface data model.",
+    )
+    delete_surface: DeleteSurface | None = Field(
+        default=None, alias="deleteSurface", description="Delete an existing surface."
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="forbid")
+
+    @model_validator(mode="after")
+    def _check_exactly_one(self) -> A2UIMessage:
+        """Enforce the spec's exactly-one-of constraint."""
+        fields = [
+            self.begin_rendering,
+            self.surface_update,
+            self.data_model_update,
+            self.delete_surface,
+        ]
+        count = sum(f is not None for f in fields)
+        if count != 1:
+            raise ValueError(f"Exactly one A2UI message type must be set, got {count}")
+        return self
+
+
+class UserAction(BaseModel):
+    """Reports a user-initiated action from a component."""
+
+    name: str = Field(description="Action name.")
+    surface_id: str = Field(alias="surfaceId", description="Source surface identifier.")
+    source_component_id: str = Field(
+        alias="sourceComponentId", description="Component that triggered the action."
+    )
+    timestamp: str = Field(description="ISO 8601 timestamp of the action.")
+    context: dict[str, Any] = Field(description="Action context payload.")
+
+    model_config = ConfigDict(populate_by_name=True)
+
+
+class ClientError(BaseModel):
+    """Reports a client-side error."""
+
+    model_config = ConfigDict(extra="allow")
+
+
+class A2UIEvent(BaseModel):
+    """Union wrapper for client-to-server events."""
+
+    user_action: UserAction | None = Field(
+        default=None, alias="userAction", description="User-initiated action event."
+    )
+    error: ClientError | None = Field(
+        default=None, description="Client-side error report."
+    )
+
+    model_config = ConfigDict(populate_by_name=True)
+
+    @model_validator(mode="after")
+    def _check_exactly_one(self) -> A2UIEvent:
+        """Enforce the spec's exactly-one-of constraint."""
+        fields = [self.user_action, self.error]
+        count = sum(f is not None for f in fields)
+        if count != 1:
+            raise ValueError(f"Exactly one A2UI event type must be set, got {count}")
+        return self
+
+
+class A2UIResponse(BaseModel):
+    """Typed wrapper for responses containing A2UI messages."""
+
+    text: str = Field(description="Raw text content of the response.")
+    a2ui_parts: list[dict[str, Any]] = Field(
+        default_factory=list, description="A2UI DataParts extracted from the response."
+    )
+    a2ui_messages: list[dict[str, Any]] = Field(
+        default_factory=list, description="Validated A2UI message dicts."
+    )
+
+
+_A2UI_KEYS = {"beginRendering", "surfaceUpdate", "dataModelUpdate", "deleteSurface"}
+
+
+def extract_a2ui_json_objects(text: str) -> list[dict[str, Any]]:
+    """Extract JSON objects containing A2UI keys from text.
+
+    Uses ``json.JSONDecoder.raw_decode`` for robust parsing that correctly
+    handles braces inside string literals.
+    """
+    decoder = json.JSONDecoder()
+    results: list[dict[str, Any]] = []
+    idx = 0
+    while idx < len(text):
+        idx = text.find("{", idx)
+        if idx == -1:
+            break
+        try:
+            obj, end_idx = decoder.raw_decode(text, idx)
+            if isinstance(obj, dict) and _A2UI_KEYS & obj.keys():
+                results.append(obj)
+            idx = end_idx
+        except json.JSONDecodeError:
+            idx += 1
+    return results

lib/crewai/src/crewai/a2a/extensions/a2ui/prompt.py

@@ -0,0 +1,76 @@
+"""System prompt generation for A2UI-capable agents."""
+
+from __future__ import annotations
+
+import json
+
+from crewai.a2a.extensions.a2ui.catalog import STANDARD_CATALOG_COMPONENTS
+from crewai.a2a.extensions.a2ui.schema import load_schema
+from crewai.a2a.extensions.a2ui.server_extension import A2UI_EXTENSION_URI
+
+
+def build_a2ui_system_prompt(
+    catalog_id: str | None = None,
+    allowed_components: list[str] | None = None,
+) -> str:
+    """Build a system prompt fragment instructing the LLM to produce A2UI output.
+
+    The prompt describes the A2UI message format, available components, and
+    data binding rules.  It includes the resolved schema so the LLM can
+    generate structured output.
+
+    Args:
+        catalog_id: Catalog identifier to reference. Defaults to the
+            standard catalog version derived from ``A2UI_EXTENSION_URI``.
+        allowed_components: Subset of component names to expose.  When
+            ``None``, all standard catalog components are available.
+
+    Returns:
+        A system prompt string to append to the agent's instructions.
+    """
+    components = sorted(
+        allowed_components
+        if allowed_components is not None
+        else STANDARD_CATALOG_COMPONENTS
+    )
+
+    catalog_label = catalog_id or f"standard ({A2UI_EXTENSION_URI.rsplit('/', 1)[-1]})"
+
+    resolved_schema = load_schema("server_to_client_with_standard_catalog")
+    schema_json = json.dumps(resolved_schema, indent=2)
+
+    return f"""\
+<A2UI_INSTRUCTIONS>
+You can generate rich, declarative UI by emitting A2UI JSON messages.
+
+CATALOG: {catalog_label}
+AVAILABLE COMPONENTS: {", ".join(components)}
+
+MESSAGE TYPES (emit exactly ONE per message):
+- beginRendering: Initialize a new surface with a root component and optional styles.
+- surfaceUpdate: Send/update components for a surface. Each component has a unique id \
+and a "component" wrapper containing exactly one component-type key.
+- dataModelUpdate: Update the data model for a surface. Data entries have a key and \
+one typed value (valueString, valueNumber, valueBoolean, valueMap).
+- deleteSurface: Remove a surface.
+
+DATA BINDING:
+- Use {{"literalString": "..."}} for inline string values.
+- Use {{"literalNumber": ...}} for inline numeric values.
+- Use {{"literalBoolean": ...}} for inline boolean values.
+- Use {{"literalArray": ["...", "..."]}} for inline array values.
+- Use {{"path": "/data/model/path"}} to bind to data model values.
+
+ACTIONS:
+- Interactive components (Button, etc.) have an "action" with a "name" and optional \
+"context" array of key/value pairs.
+- Values in action context can use data binding (path or literal).
+
+OUTPUT FORMAT:
+Emit each A2UI message as a valid JSON object. When generating UI, produce a \
+beginRendering message first, then surfaceUpdate messages with components, and \
+optionally dataModelUpdate messages to populate data-bound values.
+
+SCHEMA:
+{schema_json}
+</A2UI_INSTRUCTIONS>"""

lib/crewai/src/crewai/a2a/extensions/a2ui/schema/__init__.py

@@ -0,0 +1,48 @@
+"""Schema loading utilities for vendored A2UI JSON schemas."""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+
+_SCHEMA_DIR = Path(__file__).parent / "v0_8"
+
+_SCHEMA_CACHE: dict[str, dict[str, Any]] = {}
+
+SCHEMA_NAMES: frozenset[str] = frozenset(
+    {
+        "server_to_client",
+        "client_to_server",
+        "standard_catalog_definition",
+        "server_to_client_with_standard_catalog",
+    }
+)
+
+
+def load_schema(name: str) -> dict[str, Any]:
+    """Load a vendored A2UI JSON schema by name.
+
+    Args:
+        name: Schema name without extension (e.g. ``"server_to_client"``).
+
+    Returns:
+        Parsed JSON schema dict.
+
+    Raises:
+        ValueError: If the schema name is not recognized.
+        FileNotFoundError: If the schema file is missing from the package.
+    """
+    if name not in SCHEMA_NAMES:
+        raise ValueError(f"Unknown schema {name!r}. Available: {sorted(SCHEMA_NAMES)}")
+
+    if name in _SCHEMA_CACHE:
+        return _SCHEMA_CACHE[name]
+
+    path = _SCHEMA_DIR / f"{name}.json"
+    with path.open() as f:
+        schema: dict[str, Any] = json.load(f)
+
+    _SCHEMA_CACHE[name] = schema
+    return schema

lib/crewai/src/crewai/a2a/extensions/a2ui/schema/v0_8/client_to_server.json

@@ -0,0 +1,53 @@
+{
+  "title": "A2UI (Agent to UI) Client-to-Server Event Schema",
+  "description": "Describes a JSON payload for a client-to-server event message.",
+  "type": "object",
+  "minProperties": 1,
+  "maxProperties": 1,
+  "properties": {
+    "userAction": {
+      "type": "object",
+      "description": "Reports a user-initiated action from a component.",
+      "properties": {
+        "name": {
+          "type": "string",
+          "description": "The name of the action, taken from the component's action.name property."
+        },
+        "surfaceId": {
+          "type": "string",
+          "description": "The id of the surface where the event originated."
+        },
+        "sourceComponentId": {
+          "type": "string",
+          "description": "The id of the component that triggered the event."
+        },
+        "timestamp": {
+          "type": "string",
+          "format": "date-time",
+          "description": "An ISO 8601 timestamp of when the event occurred."
+        },
+        "context": {
+          "type": "object",
+          "description": "A JSON object containing the key-value pairs from the component's action.context, after resolving all data bindings.",
+          "additionalProperties": true
+        }
+      },
+      "required": [
+        "name",
+        "surfaceId",
+        "sourceComponentId",
+        "timestamp",
+        "context"
+      ]
+    },
+    "error": {
+      "type": "object",
+      "description": "Reports a client-side error. The content is flexible.",
+      "additionalProperties": true
+    }
+  },
+  "oneOf": [
+    { "required": ["userAction"] },
+    { "required": ["error"] }
+  ]
+}

lib/crewai/src/crewai/a2a/extensions/a2ui/schema/v0_8/server_to_client.json

@@ -0,0 +1,148 @@
+{
+  "title": "A2UI Message Schema",
+  "description": "Describes a JSON payload for an A2UI (Agent to UI) message, which is used to dynamically construct and update user interfaces. A message MUST contain exactly ONE of the action properties: 'beginRendering', 'surfaceUpdate', 'dataModelUpdate', or 'deleteSurface'.",
+  "type": "object",
+  "additionalProperties": false,
+  "properties": {
+    "beginRendering": {
+      "type": "object",
+      "description": "Signals the client to begin rendering a surface with a root component and specific styles.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface to be rendered."
+        },
+        "catalogId": {
+          "type": "string",
+          "description": "The identifier of the component catalog to use for this surface. If omitted, the client MUST default to the standard catalog for this A2UI version (https://a2ui.org/specification/v0_8/standard_catalog_definition.json)."
+        },
+        "root": {
+          "type": "string",
+          "description": "The ID of the root component to render."
+        },
+        "styles": {
+          "type": "object",
+          "description": "Styling information for the UI.",
+          "additionalProperties": true
+        }
+      },
+      "required": ["root", "surfaceId"]
+    },
+    "surfaceUpdate": {
+      "type": "object",
+      "description": "Updates a surface with a new set of components.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface to be updated. If you are adding a new surface this *must* be a new, unique identified that has never been used for any existing surfaces shown."
+        },
+        "components": {
+          "type": "array",
+          "description": "A list containing all UI components for the surface.",
+          "minItems": 1,
+          "items": {
+            "type": "object",
+            "description": "Represents a *single* component in a UI widget tree. This component could be one of many supported types.",
+            "additionalProperties": false,
+            "properties": {
+              "id": {
+                "type": "string",
+                "description": "The unique identifier for this component."
+              },
+              "weight": {
+                "type": "number",
+                "description": "The relative weight of this component within a Row or Column. This corresponds to the CSS 'flex-grow' property. Note: this may ONLY be set when the component is a direct descendant of a Row or Column."
+              },
+              "component": {
+                "type": "object",
+                "description": "A wrapper object that MUST contain exactly one key, which is the name of the component type. The value is an object containing the properties for that specific component.",
+                "additionalProperties": true
+              }
+            },
+            "required": ["id", "component"]
+          }
+        }
+      },
+      "required": ["surfaceId", "components"]
+    },
+    "dataModelUpdate": {
+      "type": "object",
+      "description": "Updates the data model for a surface.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface this data model update applies to."
+        },
+        "path": {
+          "type": "string",
+          "description": "An optional path to a location within the data model (e.g., '/user/name'). If omitted, or set to '/', the entire data model will be replaced."
+        },
+        "contents": {
+          "type": "array",
+          "description": "An array of data entries. Each entry must contain a 'key' and exactly one corresponding typed 'value*' property.",
+          "items": {
+            "type": "object",
+            "description": "A single data entry. Exactly one 'value*' property should be provided alongside the key.",
+            "additionalProperties": false,
+            "properties": {
+              "key": {
+                "type": "string",
+                "description": "The key for this data entry."
+              },
+              "valueString": {
+                "type": "string"
+              },
+              "valueNumber": {
+                "type": "number"
+              },
+              "valueBoolean": {
+                "type": "boolean"
+              },
+              "valueMap": {
+                "description": "Represents a map as an adjacency list.",
+                "type": "array",
+                "items": {
+                  "type": "object",
+                  "description": "One entry in the map. Exactly one 'value*' property should be provided alongside the key.",
+                  "additionalProperties": false,
+                  "properties": {
+                    "key": {
+                      "type": "string"
+                    },
+                    "valueString": {
+                      "type": "string"
+                    },
+                    "valueNumber": {
+                      "type": "number"
+                    },
+                    "valueBoolean": {
+                      "type": "boolean"
+                    }
+                  },
+                  "required": ["key"]
+                }
+              }
+            },
+            "required": ["key"]
+          }
+        }
+      },
+      "required": ["contents", "surfaceId"]
+    },
+    "deleteSurface": {
+      "type": "object",
+      "description": "Signals the client to delete the surface identified by 'surfaceId'.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface to be deleted."
+        }
+      },
+      "required": ["surfaceId"]
+    }
+  }
+}

lib/crewai/src/crewai/a2a/extensions/a2ui/schema/v0_8/server_to_client_with_standard_catalog.json

@@ -0,0 +1,823 @@
+{
+  "title": "A2UI Message Schema",
+  "description": "Describes a JSON payload for an A2UI (Agent to UI) message, which is used to dynamically construct and update user interfaces. A message MUST contain exactly ONE of the action properties: 'beginRendering', 'surfaceUpdate', 'dataModelUpdate', or 'deleteSurface'.",
+  "type": "object",
+  "additionalProperties": false,
+  "properties": {
+    "beginRendering": {
+      "type": "object",
+      "description": "Signals the client to begin rendering a surface with a root component and specific styles.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface to be rendered."
+        },
+        "root": {
+          "type": "string",
+          "description": "The ID of the root component to render."
+        },
+        "styles": {
+          "type": "object",
+          "description": "Styling information for the UI.",
+          "additionalProperties": false,
+          "properties": {
+            "font": {
+              "type": "string",
+              "description": "The primary font for the UI."
+            },
+            "primaryColor": {
+              "type": "string",
+              "description": "The primary UI color as a hexadecimal code (e.g., '#00BFFF').",
+              "pattern": "^#[0-9a-fA-F]{6}$"
+            }
+          }
+        }
+      },
+      "required": ["root", "surfaceId"]
+    },
+    "surfaceUpdate": {
+      "type": "object",
+      "description": "Updates a surface with a new set of components.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface to be updated. If you are adding a new surface this *must* be a new, unique identified that has never been used for any existing surfaces shown."
+        },
+        "components": {
+          "type": "array",
+          "description": "A list containing all UI components for the surface.",
+          "minItems": 1,
+          "items": {
+            "type": "object",
+            "description": "Represents a *single* component in a UI widget tree. This component could be one of many supported types.",
+            "additionalProperties": false,
+            "properties": {
+              "id": {
+                "type": "string",
+                "description": "The unique identifier for this component."
+              },
+              "weight": {
+                "type": "number",
+                "description": "The relative weight of this component within a Row or Column. This corresponds to the CSS 'flex-grow' property. Note: this may ONLY be set when the component is a direct descendant of a Row or Column."
+              },
+              "component": {
+                "type": "object",
+                "description": "A wrapper object that MUST contain exactly one key, which is the name of the component type (e.g., 'Heading'). The value is an object containing the properties for that specific component.",
+                "additionalProperties": false,
+                "properties": {
+                  "Text": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "text": {
+                        "type": "object",
+                        "description": "The text content to display. This can be a literal string or a reference to a value in the data model ('path', e.g., '/doc/title'). While simple Markdown formatting is supported (i.e. without HTML, images, or links), utilizing dedicated UI components is generally preferred for a richer and more structured presentation.",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "usageHint": {
+                        "type": "string",
+                        "description": "A hint for the base text style. One of:\n- `h1`: Largest heading.\n- `h2`: Second largest heading.\n- `h3`: Third largest heading.\n- `h4`: Fourth largest heading.\n- `h5`: Fifth largest heading.\n- `caption`: Small text for captions.\n- `body`: Standard body text.",
+                        "enum": [
+                          "h1",
+                          "h2",
+                          "h3",
+                          "h4",
+                          "h5",
+                          "caption",
+                          "body"
+                        ]
+                      }
+                    },
+                    "required": ["text"]
+                  },
+                  "Image": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "url": {
+                        "type": "object",
+                        "description": "The URL of the image to display. This can be a literal string ('literal') or a reference to a value in the data model ('path', e.g. '/thumbnail/url').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "fit": {
+                        "type": "string",
+                        "description": "Specifies how the image should be resized to fit its container. This corresponds to the CSS 'object-fit' property.",
+                        "enum": [
+                          "contain",
+                          "cover",
+                          "fill",
+                          "none",
+                          "scale-down"
+                        ]
+                      },
+                      "usageHint": {
+                        "type": "string",
+                        "description": "A hint for the image size and style. One of:\n- `icon`: Small square icon.\n- `avatar`: Circular avatar image.\n- `smallFeature`: Small feature image.\n- `mediumFeature`: Medium feature image.\n- `largeFeature`: Large feature image.\n- `header`: Full-width, full bleed, header image.",
+                        "enum": [
+                          "icon",
+                          "avatar",
+                          "smallFeature",
+                          "mediumFeature",
+                          "largeFeature",
+                          "header"
+                        ]
+                      }
+                    },
+                    "required": ["url"]
+                  },
+                  "Icon": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "name": {
+                        "type": "object",
+                        "description": "The name of the icon to display. This can be a literal string or a reference to a value in the data model ('path', e.g. '/form/submit').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string",
+                            "enum": [
+                              "accountCircle",
+                              "add",
+                              "arrowBack",
+                              "arrowForward",
+                              "attachFile",
+                              "calendarToday",
+                              "call",
+                              "camera",
+                              "check",
+                              "close",
+                              "delete",
+                              "download",
+                              "edit",
+                              "event",
+                              "error",
+                              "favorite",
+                              "favoriteOff",
+                              "folder",
+                              "help",
+                              "home",
+                              "info",
+                              "locationOn",
+                              "lock",
+                              "lockOpen",
+                              "mail",
+                              "menu",
+                              "moreVert",
+                              "moreHoriz",
+                              "notificationsOff",
+                              "notifications",
+                              "payment",
+                              "person",
+                              "phone",
+                              "photo",
+                              "print",
+                              "refresh",
+                              "search",
+                              "send",
+                              "settings",
+                              "share",
+                              "shoppingCart",
+                              "star",
+                              "starHalf",
+                              "starOff",
+                              "upload",
+                              "visibility",
+                              "visibilityOff",
+                              "warning"
+                            ]
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      }
+                    },
+                    "required": ["name"]
+                  },
+                  "Video": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "url": {
+                        "type": "object",
+                        "description": "The URL of the video to display. This can be a literal string or a reference to a value in the data model ('path', e.g. '/video/url').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      }
+                    },
+                    "required": ["url"]
+                  },
+                  "AudioPlayer": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "url": {
+                        "type": "object",
+                        "description": "The URL of the audio to be played. This can be a literal string ('literal') or a reference to a value in the data model ('path', e.g. '/song/url').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "description": {
+                        "type": "object",
+                        "description": "A description of the audio, such as a title or summary. This can be a literal string or a reference to a value in the data model ('path', e.g. '/song/title').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      }
+                    },
+                    "required": ["url"]
+                  },
+                  "Row": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "children": {
+                        "type": "object",
+                        "description": "Defines the children. Use 'explicitList' for a fixed set of children, or 'template' to generate children from a data list.",
+                        "additionalProperties": false,
+                        "properties": {
+                          "explicitList": {
+                            "type": "array",
+                            "items": {
+                              "type": "string"
+                            }
+                          },
+                          "template": {
+                            "type": "object",
+                            "description": "A template for generating a dynamic list of children from a data model list. `componentId` is the component to use as a template, and `dataBinding` is the path to the map of components in the data model. Values in the map will define the list of children.",
+                            "additionalProperties": false,
+                            "properties": {
+                              "componentId": {
+                                "type": "string"
+                              },
+                              "dataBinding": {
+                                "type": "string"
+                              }
+                            },
+                            "required": ["componentId", "dataBinding"]
+                          }
+                        }
+                      },
+                      "distribution": {
+                        "type": "string",
+                        "description": "Defines the arrangement of children along the main axis (horizontally). This corresponds to the CSS 'justify-content' property.",
+                        "enum": [
+                          "center",
+                          "end",
+                          "spaceAround",
+                          "spaceBetween",
+                          "spaceEvenly",
+                          "start"
+                        ]
+                      },
+                      "alignment": {
+                        "type": "string",
+                        "description": "Defines the alignment of children along the cross axis (vertically). This corresponds to the CSS 'align-items' property.",
+                        "enum": ["start", "center", "end", "stretch"]
+                      }
+                    },
+                    "required": ["children"]
+                  },
+                  "Column": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "children": {
+                        "type": "object",
+                        "description": "Defines the children. Use 'explicitList' for a fixed set of children, or 'template' to generate children from a data list.",
+                        "additionalProperties": false,
+                        "properties": {
+                          "explicitList": {
+                            "type": "array",
+                            "items": {
+                              "type": "string"
+                            }
+                          },
+                          "template": {
+                            "type": "object",
+                            "description": "A template for generating a dynamic list of children from a data model list. `componentId` is the component to use as a template, and `dataBinding` is the path to the map of components in the data model. Values in the map will define the list of children.",
+                            "additionalProperties": false,
+                            "properties": {
+                              "componentId": {
+                                "type": "string"
+                              },
+                              "dataBinding": {
+                                "type": "string"
+                              }
+                            },
+                            "required": ["componentId", "dataBinding"]
+                          }
+                        }
+                      },
+                      "distribution": {
+                        "type": "string",
+                        "description": "Defines the arrangement of children along the main axis (vertically). This corresponds to the CSS 'justify-content' property.",
+                        "enum": [
+                          "start",
+                          "center",
+                          "end",
+                          "spaceBetween",
+                          "spaceAround",
+                          "spaceEvenly"
+                        ]
+                      },
+                      "alignment": {
+                        "type": "string",
+                        "description": "Defines the alignment of children along the cross axis (horizontally). This corresponds to the CSS 'align-items' property.",
+                        "enum": ["center", "end", "start", "stretch"]
+                      }
+                    },
+                    "required": ["children"]
+                  },
+                  "List": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "children": {
+                        "type": "object",
+                        "description": "Defines the children. Use 'explicitList' for a fixed set of children, or 'template' to generate children from a data list.",
+                        "additionalProperties": false,
+                        "properties": {
+                          "explicitList": {
+                            "type": "array",
+                            "items": {
+                              "type": "string"
+                            }
+                          },
+                          "template": {
+                            "type": "object",
+                            "description": "A template for generating a dynamic list of children from a data model list. `componentId` is the component to use as a template, and `dataBinding` is the path to the map of components in the data model. Values in the map will define the list of children.",
+                            "additionalProperties": false,
+                            "properties": {
+                              "componentId": {
+                                "type": "string"
+                              },
+                              "dataBinding": {
+                                "type": "string"
+                              }
+                            },
+                            "required": ["componentId", "dataBinding"]
+                          }
+                        }
+                      },
+                      "direction": {
+                        "type": "string",
+                        "description": "The direction in which the list items are laid out.",
+                        "enum": ["vertical", "horizontal"]
+                      },
+                      "alignment": {
+                        "type": "string",
+                        "description": "Defines the alignment of children along the cross axis.",
+                        "enum": ["start", "center", "end", "stretch"]
+                      }
+                    },
+                    "required": ["children"]
+                  },
+                  "Card": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "child": {
+                        "type": "string",
+                        "description": "The ID of the component to be rendered inside the card."
+                      }
+                    },
+                    "required": ["child"]
+                  },
+                  "Tabs": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "tabItems": {
+                        "type": "array",
+                        "description": "An array of objects, where each object defines a tab with a title and a child component.",
+                        "items": {
+                          "type": "object",
+                          "additionalProperties": false,
+                          "properties": {
+                            "title": {
+                              "type": "object",
+                              "description": "The tab title. Defines the value as either a literal value or a path to data model value (e.g. '/options/title').",
+                              "additionalProperties": false,
+                              "properties": {
+                                "literalString": {
+                                  "type": "string"
+                                },
+                                "path": {
+                                  "type": "string"
+                                }
+                              }
+                            },
+                            "child": {
+                              "type": "string"
+                            }
+                          },
+                          "required": ["title", "child"]
+                        }
+                      }
+                    },
+                    "required": ["tabItems"]
+                  },
+                  "Divider": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "axis": {
+                        "type": "string",
+                        "description": "The orientation of the divider.",
+                        "enum": ["horizontal", "vertical"]
+                      }
+                    }
+                  },
+                  "Modal": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "entryPointChild": {
+                        "type": "string",
+                        "description": "The ID of the component that opens the modal when interacted with (e.g., a button)."
+                      },
+                      "contentChild": {
+                        "type": "string",
+                        "description": "The ID of the component to be displayed inside the modal."
+                      }
+                    },
+                    "required": ["entryPointChild", "contentChild"]
+                  },
+                  "Button": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "child": {
+                        "type": "string",
+                        "description": "The ID of the component to display in the button, typically a Text component."
+                      },
+                      "primary": {
+                        "type": "boolean",
+                        "description": "Indicates if this button should be styled as the primary action."
+                      },
+                      "action": {
+                        "type": "object",
+                        "description": "The client-side action to be dispatched when the button is clicked. It includes the action's name and an optional context payload.",
+                        "additionalProperties": false,
+                        "properties": {
+                          "name": {
+                            "type": "string"
+                          },
+                          "context": {
+                            "type": "array",
+                            "items": {
+                              "type": "object",
+                              "additionalProperties": false,
+                              "properties": {
+                                "key": {
+                                  "type": "string"
+                                },
+                                "value": {
+                                  "type": "object",
+                                  "description": "Defines the value to be included in the context as either a literal value or a path to a data model value (e.g. '/user/name').",
+                                  "additionalProperties": false,
+                                  "properties": {
+                                    "path": {
+                                      "type": "string"
+                                    },
+                                    "literalString": {
+                                      "type": "string"
+                                    },
+                                    "literalNumber": {
+                                      "type": "number"
+                                    },
+                                    "literalBoolean": {
+                                      "type": "boolean"
+                                    }
+                                  }
+                                }
+                              },
+                              "required": ["key", "value"]
+                            }
+                          }
+                        },
+                        "required": ["name"]
+                      }
+                    },
+                    "required": ["child", "action"]
+                  },
+                  "CheckBox": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "label": {
+                        "type": "object",
+                        "description": "The text to display next to the checkbox. Defines the value as either a literal value or a path to data model ('path', e.g. '/option/label').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "value": {
+                        "type": "object",
+                        "description": "The current state of the checkbox (true for checked, false for unchecked). This can be a literal boolean ('literalBoolean') or a reference to a value in the data model ('path', e.g. '/filter/open').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalBoolean": {
+                            "type": "boolean"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      }
+                    },
+                    "required": ["label", "value"]
+                  },
+                  "TextField": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "label": {
+                        "type": "object",
+                        "description": "The text label for the input field. This can be a literal string or a reference to a value in the data model ('path, e.g. '/user/name').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "text": {
+                        "type": "object",
+                        "description": "The value of the text field. This can be a literal string or a reference to a value in the data model ('path', e.g. '/user/name').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "textFieldType": {
+                        "type": "string",
+                        "description": "The type of input field to display.",
+                        "enum": [
+                          "date",
+                          "longText",
+                          "number",
+                          "shortText",
+                          "obscured"
+                        ]
+                      },
+                      "validationRegexp": {
+                        "type": "string",
+                        "description": "A regular expression used for client-side validation of the input."
+                      }
+                    },
+                    "required": ["label"]
+                  },
+                  "DateTimeInput": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "value": {
+                        "type": "object",
+                        "description": "The selected date and/or time value in ISO 8601 format. This can be a literal string ('literalString') or a reference to a value in the data model ('path', e.g. '/user/dob').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalString": {
+                            "type": "string"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "enableDate": {
+                        "type": "boolean",
+                        "description": "If true, allows the user to select a date."
+                      },
+                      "enableTime": {
+                        "type": "boolean",
+                        "description": "If true, allows the user to select a time."
+                      }
+                    },
+                    "required": ["value"]
+                  },
+                  "MultipleChoice": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "selections": {
+                        "type": "object",
+                        "description": "The currently selected values for the component. This can be a literal array of strings or a path to an array in the data model('path', e.g. '/hotel/options').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalArray": {
+                            "type": "array",
+                            "items": {
+                              "type": "string"
+                            }
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "options": {
+                        "type": "array",
+                        "description": "An array of available options for the user to choose from.",
+                        "items": {
+                          "type": "object",
+                          "additionalProperties": false,
+                          "properties": {
+                            "label": {
+                              "type": "object",
+                              "description": "The text to display for this option. This can be a literal string or a reference to a value in the data model (e.g. '/option/label').",
+                              "additionalProperties": false,
+                              "properties": {
+                                "literalString": {
+                                  "type": "string"
+                                },
+                                "path": {
+                                  "type": "string"
+                                }
+                              }
+                            },
+                            "value": {
+                              "type": "string",
+                              "description": "The value to be associated with this option when selected."
+                            }
+                          },
+                          "required": ["label", "value"]
+                        }
+                      },
+                      "maxAllowedSelections": {
+                        "type": "integer",
+                        "description": "The maximum number of options that the user is allowed to select."
+                      }
+                    },
+                    "required": ["selections", "options"]
+                  },
+                  "Slider": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "value": {
+                        "type": "object",
+                        "description": "The current value of the slider. This can be a literal number ('literalNumber') or a reference to a value in the data model ('path', e.g. '/restaurant/cost').",
+                        "additionalProperties": false,
+                        "properties": {
+                          "literalNumber": {
+                            "type": "number"
+                          },
+                          "path": {
+                            "type": "string"
+                          }
+                        }
+                      },
+                      "minValue": {
+                        "type": "number",
+                        "description": "The minimum value of the slider."
+                      },
+                      "maxValue": {
+                        "type": "number",
+                        "description": "The maximum value of the slider."
+                      }
+                    },
+                    "required": ["value"]
+                  }
+                }
+              }
+            },
+            "required": ["id", "component"]
+          }
+        }
+      },
+      "required": ["surfaceId", "components"]
+    },
+    "dataModelUpdate": {
+      "type": "object",
+      "description": "Updates the data model for a surface.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface this data model update applies to."
+        },
+        "path": {
+          "type": "string",
+          "description": "An optional path to a location within the data model (e.g., '/user/name'). If omitted, or set to '/', the entire data model will be replaced."
+        },
+        "contents": {
+          "type": "array",
+          "description": "An array of data entries. Each entry must contain a 'key' and exactly one corresponding typed 'value*' property.",
+          "items": {
+            "type": "object",
+            "description": "A single data entry. Exactly one 'value*' property should be provided alongside the key.",
+            "additionalProperties": false,
+            "properties": {
+              "key": {
+                "type": "string",
+                "description": "The key for this data entry."
+              },
+              "valueString": {
+                "type": "string"
+              },
+              "valueNumber": {
+                "type": "number"
+              },
+              "valueBoolean": {
+                "type": "boolean"
+              },
+              "valueMap": {
+                "description": "Represents a map as an adjacency list.",
+                "type": "array",
+                "items": {
+                  "type": "object",
+                  "description": "One entry in the map. Exactly one 'value*' property should be provided alongside the key.",
+                  "additionalProperties": false,
+                  "properties": {
+                    "key": {
+                      "type": "string"
+                    },
+                    "valueString": {
+                      "type": "string"
+                    },
+                    "valueNumber": {
+                      "type": "number"
+                    },
+                    "valueBoolean": {
+                      "type": "boolean"
+                    }
+                  },
+                  "required": ["key"]
+                }
+              }
+            },
+            "required": ["key"]
+          }
+        }
+      },
+      "required": ["contents", "surfaceId"]
+    },
+    "deleteSurface": {
+      "type": "object",
+      "description": "Signals the client to delete the surface identified by 'surfaceId'.",
+      "additionalProperties": false,
+      "properties": {
+        "surfaceId": {
+          "type": "string",
+          "description": "The unique identifier for the UI surface to be deleted."
+        }
+      },
+      "required": ["surfaceId"]
+    }
+  }
+}

lib/crewai/src/crewai/a2a/extensions/a2ui/schema/v0_8/standard_catalog_definition.json

@@ -0,0 +1,459 @@
+{
+  "components": {
+    "Text": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "text": {
+          "type": "object",
+          "description": "The text content to display. This can be a literal string or a reference to a value in the data model ('path', e.g., '/doc/title'). While simple Markdown formatting is supported (i.e. without HTML, images, or links), utilizing dedicated UI components is generally preferred for a richer and more structured presentation.",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        },
+        "usageHint": {
+          "type": "string",
+          "description": "A hint for the base text style.",
+          "enum": ["h1", "h2", "h3", "h4", "h5", "caption", "body"]
+        }
+      },
+      "required": ["text"]
+    },
+    "Image": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "url": {
+          "type": "object",
+          "description": "The URL of the image to display.",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        },
+        "fit": {
+          "type": "string",
+          "description": "Specifies how the image should be resized to fit its container.",
+          "enum": ["contain", "cover", "fill", "none", "scale-down"]
+        },
+        "usageHint": {
+          "type": "string",
+          "description": "A hint for the image size and style.",
+          "enum": ["icon", "avatar", "smallFeature", "mediumFeature", "largeFeature", "header"]
+        }
+      },
+      "required": ["url"]
+    },
+    "Icon": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "name": {
+          "type": "object",
+          "description": "The name of the icon to display.",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": {
+              "type": "string",
+              "enum": [
+                "accountCircle", "add", "arrowBack", "arrowForward", "attachFile",
+                "calendarToday", "call", "camera", "check", "close", "delete",
+                "download", "edit", "event", "error", "favorite", "favoriteOff",
+                "folder", "help", "home", "info", "locationOn", "lock", "lockOpen",
+                "mail", "menu", "moreVert", "moreHoriz", "notificationsOff",
+                "notifications", "payment", "person", "phone", "photo", "print",
+                "refresh", "search", "send", "settings", "share", "shoppingCart",
+                "star", "starHalf", "starOff", "upload", "visibility",
+                "visibilityOff", "warning"
+              ]
+            },
+            "path": { "type": "string" }
+          }
+        }
+      },
+      "required": ["name"]
+    },
+    "Video": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "url": {
+          "type": "object",
+          "description": "The URL of the video to display.",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        }
+      },
+      "required": ["url"]
+    },
+    "AudioPlayer": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "url": {
+          "type": "object",
+          "description": "The URL of the audio to be played.",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        },
+        "description": {
+          "type": "object",
+          "description": "A description of the audio, such as a title or summary.",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        }
+      },
+      "required": ["url"]
+    },
+    "Row": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "children": {
+          "type": "object",
+          "description": "Defines the children. Use 'explicitList' for a fixed set of children, or 'template' to generate children from a data list.",
+          "additionalProperties": false,
+          "properties": {
+            "explicitList": { "type": "array", "items": { "type": "string" } },
+            "template": {
+              "type": "object",
+              "additionalProperties": false,
+              "properties": {
+                "componentId": { "type": "string" },
+                "dataBinding": { "type": "string" }
+              },
+              "required": ["componentId", "dataBinding"]
+            }
+          }
+        },
+        "distribution": {
+          "type": "string",
+          "enum": ["center", "end", "spaceAround", "spaceBetween", "spaceEvenly", "start"]
+        },
+        "alignment": {
+          "type": "string",
+          "enum": ["start", "center", "end", "stretch"]
+        }
+      },
+      "required": ["children"]
+    },
+    "Column": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "children": {
+          "type": "object",
+          "description": "Defines the children. Use 'explicitList' for a fixed set of children, or 'template' to generate children from a data list.",
+          "additionalProperties": false,
+          "properties": {
+            "explicitList": { "type": "array", "items": { "type": "string" } },
+            "template": {
+              "type": "object",
+              "additionalProperties": false,
+              "properties": {
+                "componentId": { "type": "string" },
+                "dataBinding": { "type": "string" }
+              },
+              "required": ["componentId", "dataBinding"]
+            }
+          }
+        },
+        "distribution": {
+          "type": "string",
+          "enum": ["start", "center", "end", "spaceBetween", "spaceAround", "spaceEvenly"]
+        },
+        "alignment": {
+          "type": "string",
+          "enum": ["center", "end", "start", "stretch"]
+        }
+      },
+      "required": ["children"]
+    },
+    "List": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "children": {
+          "type": "object",
+          "description": "Defines the children. Use 'explicitList' for a fixed set of children, or 'template' to generate children from a data list.",
+          "additionalProperties": false,
+          "properties": {
+            "explicitList": { "type": "array", "items": { "type": "string" } },
+            "template": {
+              "type": "object",
+              "additionalProperties": false,
+              "properties": {
+                "componentId": { "type": "string" },
+                "dataBinding": { "type": "string" }
+              },
+              "required": ["componentId", "dataBinding"]
+            }
+          }
+        },
+        "direction": {
+          "type": "string",
+          "enum": ["vertical", "horizontal"]
+        },
+        "alignment": {
+          "type": "string",
+          "enum": ["start", "center", "end", "stretch"]
+        }
+      },
+      "required": ["children"]
+    },
+    "Card": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "child": {
+          "type": "string",
+          "description": "The ID of the component to be rendered inside the card."
+        }
+      },
+      "required": ["child"]
+    },
+    "Tabs": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "tabItems": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "additionalProperties": false,
+            "properties": {
+              "title": {
+                "type": "object",
+                "additionalProperties": false,
+                "properties": {
+                  "literalString": { "type": "string" },
+                  "path": { "type": "string" }
+                }
+              },
+              "child": { "type": "string" }
+            },
+            "required": ["title", "child"]
+          }
+        }
+      },
+      "required": ["tabItems"]
+    },
+    "Divider": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "axis": {
+          "type": "string",
+          "enum": ["horizontal", "vertical"]
+        }
+      }
+    },
+    "Modal": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "entryPointChild": {
+          "type": "string",
+          "description": "The ID of the component that opens the modal when interacted with."
+        },
+        "contentChild": {
+          "type": "string",
+          "description": "The ID of the component to be displayed inside the modal."
+        }
+      },
+      "required": ["entryPointChild", "contentChild"]
+    },
+    "Button": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "child": {
+          "type": "string",
+          "description": "The ID of the component to display in the button."
+        },
+        "primary": {
+          "type": "boolean",
+          "description": "Indicates if this button should be styled as the primary action."
+        },
+        "action": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "name": { "type": "string" },
+            "context": {
+              "type": "array",
+              "items": {
+                "type": "object",
+                "additionalProperties": false,
+                "properties": {
+                  "key": { "type": "string" },
+                  "value": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                      "path": { "type": "string" },
+                      "literalString": { "type": "string" },
+                      "literalNumber": { "type": "number" },
+                      "literalBoolean": { "type": "boolean" }
+                    }
+                  }
+                },
+                "required": ["key", "value"]
+              }
+            }
+          },
+          "required": ["name"]
+        }
+      },
+      "required": ["child", "action"]
+    },
+    "CheckBox": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "label": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        },
+        "value": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "literalBoolean": { "type": "boolean" },
+            "path": { "type": "string" }
+          }
+        }
+      },
+      "required": ["label", "value"]
+    },
+    "TextField": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "label": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        },
+        "text": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        },
+        "textFieldType": {
+          "type": "string",
+          "enum": ["date", "longText", "number", "shortText", "obscured"]
+        },
+        "validationRegexp": { "type": "string" }
+      },
+      "required": ["label"]
+    },
+    "DateTimeInput": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "value": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "literalString": { "type": "string" },
+            "path": { "type": "string" }
+          }
+        },
+        "enableDate": { "type": "boolean" },
+        "enableTime": { "type": "boolean" }
+      },
+      "required": ["value"]
+    },
+    "MultipleChoice": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "selections": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "literalArray": { "type": "array", "items": { "type": "string" } },
+            "path": { "type": "string" }
+          }
+        },
+        "options": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "additionalProperties": false,
+            "properties": {
+              "label": {
+                "type": "object",
+                "additionalProperties": false,
+                "properties": {
+                  "literalString": { "type": "string" },
+                  "path": { "type": "string" }
+                }
+              },
+              "value": { "type": "string" }
+            },
+            "required": ["label", "value"]
+          }
+        },
+        "maxAllowedSelections": { "type": "integer" },
+        "variant": {
+          "type": "string",
+          "enum": ["checkbox", "chips"]
+        },
+        "filterable": { "type": "boolean" }
+      },
+      "required": ["selections", "options"]
+    },
+    "Slider": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "value": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "literalNumber": { "type": "number" },
+            "path": { "type": "string" }
+          }
+        },
+        "minValue": { "type": "number" },
+        "maxValue": { "type": "number" }
+      },
+      "required": ["value"]
+    }
+  },
+  "styles": {
+    "font": {
+      "type": "string",
+      "description": "The primary font for the UI."
+    },
+    "primaryColor": {
+      "type": "string",
+      "description": "The primary UI color as a hexadecimal code (e.g., '#00BFFF').",
+      "pattern": "^#[0-9a-fA-F]{6}$"
+    }
+  }
+}

lib/crewai/src/crewai/a2a/extensions/a2ui/server_extension.py

@@ -0,0 +1,125 @@
+"""A2UI server extension for the A2A protocol."""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from crewai.a2a.extensions.a2ui.models import A2UIResponse, extract_a2ui_json_objects
+from crewai.a2a.extensions.a2ui.validator import (
+    A2UIValidationError,
+    validate_a2ui_message,
+)
+from crewai.a2a.extensions.server import ExtensionContext, ServerExtension
+
+
+logger = logging.getLogger(__name__)
+
+A2UI_MIME_TYPE = "application/json+a2ui"
+A2UI_EXTENSION_URI = "https://a2ui.org/a2a-extension/a2ui/v0.8"
+
+
+class A2UIServerExtension(ServerExtension):
+    """A2A server extension that enables A2UI declarative UI generation.
+
+    When activated by a client that declares A2UI v0.8 support,
+    this extension:
+
+    * Negotiates catalog preferences during ``on_request``.
+    * Wraps A2UI messages in the agent response as A2A DataParts with
+      ``application/json+a2ui`` MIME type during ``on_response``.
+
+    Example::
+
+        A2AServerConfig(
+            server_extensions=[A2UIServerExtension()],
+            default_output_modes=["text/plain", "application/json+a2ui"],
+        )
+    """
+
+    uri: str = A2UI_EXTENSION_URI
+    required: bool = False
+    description: str = "A2UI declarative UI generation"
+
+    def __init__(
+        self,
+        catalog_ids: list[str] | None = None,
+        accept_inline_catalogs: bool = False,
+    ) -> None:
+        """Initialize the A2UI server extension.
+
+        Args:
+            catalog_ids: Catalog identifiers this server supports.
+            accept_inline_catalogs: Whether inline catalog definitions are accepted.
+        """
+        self._catalog_ids = catalog_ids or []
+        self._accept_inline_catalogs = accept_inline_catalogs
+
+    @property
+    def params(self) -> dict[str, Any]:
+        """Extension parameters advertised in the AgentCard."""
+        result: dict[str, Any] = {}
+        if self._catalog_ids:
+            result["supportedCatalogIds"] = self._catalog_ids
+        result["acceptsInlineCatalogs"] = self._accept_inline_catalogs
+        return result
+
+    async def on_request(self, context: ExtensionContext) -> None:
+        """Extract A2UI catalog preferences from the client request.
+
+        Stores the negotiated catalog in ``context.state`` under
+        ``"a2ui_catalog_id"`` for downstream use.
+        """
+        if not self.is_active(context):
+            return
+
+        catalog_id = context.get_extension_metadata(self.uri, "catalogId")
+        if isinstance(catalog_id, str):
+            context.state["a2ui_catalog_id"] = catalog_id
+        elif self._catalog_ids:
+            context.state["a2ui_catalog_id"] = self._catalog_ids[0]
+
+        context.state["a2ui_active"] = True
+
+    async def on_response(self, context: ExtensionContext, result: Any) -> Any:
+        """Wrap A2UI messages in the result as A2A DataParts.
+
+        Scans the result for A2UI JSON payloads and converts them into
+        DataParts with ``application/json+a2ui`` MIME type and A2UI metadata.
+        """
+        if not context.state.get("a2ui_active"):
+            return result
+
+        if not isinstance(result, str):
+            return result
+
+        a2ui_messages = extract_a2ui_json_objects(result)
+        if not a2ui_messages:
+            return result
+
+        data_parts = [
+            part
+            for part in (_build_data_part(msg_data) for msg_data in a2ui_messages)
+            if part is not None
+        ]
+
+        if not data_parts:
+            return result
+
+        return A2UIResponse(text=result, a2ui_parts=data_parts)
+
+
+def _build_data_part(msg_data: dict[str, Any]) -> dict[str, Any] | None:
+    """Validate a single A2UI message and wrap it as a DataPart dict."""
+    try:
+        validated = validate_a2ui_message(msg_data)
+    except A2UIValidationError:
+        logger.warning("Skipping invalid A2UI message in response", exc_info=True)
+        return None
+    return {
+        "kind": "data",
+        "data": validated.model_dump(by_alias=True, exclude_none=True),
+        "metadata": {
+            "mimeType": A2UI_MIME_TYPE,
+        },
+    }

lib/crewai/src/crewai/a2a/extensions/a2ui/validator.py

@@ -0,0 +1,59 @@
+"""Validate A2UI message dicts via Pydantic models."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import ValidationError
+
+from crewai.a2a.extensions.a2ui.models import A2UIEvent, A2UIMessage
+
+
+class A2UIValidationError(Exception):
+    """Raised when an A2UI message fails validation."""
+
+    def __init__(self, message: str, errors: list[Any] | None = None) -> None:
+        super().__init__(message)
+        self.errors = errors or []
+
+
+def validate_a2ui_message(data: dict[str, Any]) -> A2UIMessage:
+    """Parse and validate an A2UI server-to-client message.
+
+    Args:
+        data: Raw message dict (JSON-decoded).
+
+    Returns:
+        Validated ``A2UIMessage`` instance.
+
+    Raises:
+        A2UIValidationError: If the data does not conform to the A2UI schema.
+    """
+    try:
+        return A2UIMessage.model_validate(data)
+    except ValidationError as exc:
+        raise A2UIValidationError(
+            f"Invalid A2UI message: {exc.error_count()} validation error(s)",
+            errors=exc.errors(),
+        ) from exc
+
+
+def validate_a2ui_event(data: dict[str, Any]) -> A2UIEvent:
+    """Parse and validate an A2UI client-to-server event.
+
+    Args:
+        data: Raw event dict (JSON-decoded).
+
+    Returns:
+        Validated ``A2UIEvent`` instance.
+
+    Raises:
+        A2UIValidationError: If the data does not conform to the A2UI event schema.
+    """
+    try:
+        return A2UIEvent.model_validate(data)
+    except ValidationError as exc:
+        raise A2UIValidationError(
+            f"Invalid A2UI event: {exc.error_count()} validation error(s)",
+            errors=exc.errors(),
+        ) from exc

lib/crewai/src/crewai/a2a/task_helpers.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 from collections.abc import AsyncIterator
-from typing import TYPE_CHECKING, Any, TypedDict
+from typing import TYPE_CHECKING, Any
 import uuid
 
 from a2a.client.errors import A2AClientHTTPError
@@ -18,7 +18,7 @@ from a2a.types import (
     TaskStatusUpdateEvent,
     TextPart,
 )
-from typing_extensions import NotRequired
+from typing_extensions import NotRequired, TypedDict
 
 from crewai.events.event_bus import crewai_event_bus
 from crewai.events.types.a2a_events import (

lib/crewai/src/crewai/a2a/types.py

@@ -7,12 +7,11 @@ from typing import (
     Any,
     Literal,
     Protocol,
-    TypedDict,
     runtime_checkable,
 )
 
 from pydantic import BeforeValidator, HttpUrl, TypeAdapter
-from typing_extensions import NotRequired
+from typing_extensions import NotRequired, TypedDict
 
 
 try:

lib/crewai/src/crewai/a2a/updates/base.py

@@ -2,10 +2,11 @@
 
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Any, NamedTuple, Protocol, TypedDict
+from typing import TYPE_CHECKING, Any, NamedTuple, Protocol
 
 from pydantic import GetCoreSchemaHandler
 from pydantic_core import CoreSchema, core_schema
+from typing_extensions import TypedDict
 
 
 class CommonParams(NamedTuple):

lib/crewai/src/crewai/a2a/utils/content_type.py

@@ -28,6 +28,7 @@ APPLICATION_PDF: Literal["application/pdf"] = "application/pdf"
 APPLICATION_OCTET_STREAM: Literal["application/octet-stream"] = (
     "application/octet-stream"
 )
+APPLICATION_A2UI_JSON: Literal["application/json+a2ui"] = "application/json+a2ui"
 
 DEFAULT_CLIENT_INPUT_MODES: Final[list[Literal["text/plain", "application/json"]]] = [
     TEXT_PLAIN,
@@ -311,6 +312,10 @@ def get_part_content_type(part: Part) -> str:
     if root.kind == "text":
         return TEXT_PLAIN
     if root.kind == "data":
+        metadata = root.metadata or {}
+        mime = metadata.get("mimeType", "")
+        if mime == APPLICATION_A2UI_JSON:
+            return APPLICATION_A2UI_JSON
         return APPLICATION_JSON
     if root.kind == "file":
         return root.file.mime_type or APPLICATION_OCTET_STREAM

lib/crewai/src/crewai/a2a/utils/task.py

@@ -10,7 +10,7 @@ from functools import wraps
 import json
 import logging
 import os
-from typing import TYPE_CHECKING, Any, ParamSpec, TypeVar, TypedDict, cast
+from typing import TYPE_CHECKING, Any, ParamSpec, TypeVar, cast
 from urllib.parse import urlparse
 
 from a2a.server.agent_execution import RequestContext
@@ -38,6 +38,7 @@ from a2a.utils import (
 from a2a.utils.errors import ServerError
 from aiocache import SimpleMemoryCache, caches  # type: ignore[import-untyped]
 from pydantic import BaseModel
+from typing_extensions import TypedDict
 
 from crewai.a2a.utils.agent_card import _get_server_config
 from crewai.a2a.utils.content_type import validate_message_parts

lib/crewai/tests/a2a/extensions/test_a2ui_schema_conformance.py

@@ -0,0 +1,319 @@
+"""Cross-validate A2UI Pydantic models against vendored JSON schemas.
+
+Ensures the two validation sources stay in sync: representative payloads
+must be accepted or rejected consistently by both the Pydantic models and
+the JSON schemas.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+import jsonschema
+import pytest
+
+from crewai.a2a.extensions.a2ui import catalog
+from crewai.a2a.extensions.a2ui.models import A2UIEvent, A2UIMessage
+from crewai.a2a.extensions.a2ui.schema import load_schema
+
+
+SERVER_SCHEMA = load_schema("server_to_client")
+CLIENT_SCHEMA = load_schema("client_to_server")
+CATALOG_SCHEMA = load_schema("standard_catalog_definition")
+
+
+def _json_schema_valid(schema: dict[str, Any], instance: dict[str, Any]) -> bool:
+    """Return True if *instance* validates against *schema*."""
+    try:
+        jsonschema.validate(instance, schema)
+        return True
+    except jsonschema.ValidationError:
+        return False
+
+
+def _pydantic_valid_message(data: dict[str, Any]) -> bool:
+    """Return True if *data* validates as an A2UIMessage."""
+    try:
+        A2UIMessage.model_validate(data)
+        return True
+    except Exception:
+        return False
+
+
+def _pydantic_valid_event(data: dict[str, Any]) -> bool:
+    """Return True if *data* validates as an A2UIEvent."""
+    try:
+        A2UIEvent.model_validate(data)
+        return True
+    except Exception:
+        return False
+
+
+# ---------------------------------------------------------------------------
+# Valid server-to-client payloads
+# ---------------------------------------------------------------------------
+
+VALID_SERVER_MESSAGES: list[dict[str, Any]] = [
+    {
+        "beginRendering": {
+            "surfaceId": "s1",
+            "root": "root-col",
+        },
+    },
+    {
+        "beginRendering": {
+            "surfaceId": "s2",
+            "root": "root-col",
+            "catalogId": "standard (v0.8)",
+            "styles": {"primaryColor": "#FF0000", "font": "Roboto"},
+        },
+    },
+    {
+        "surfaceUpdate": {
+            "surfaceId": "s1",
+            "components": [
+                {
+                    "id": "title",
+                    "component": {
+                        "Text": {"text": {"literalString": "Hello"}},
+                    },
+                },
+            ],
+        },
+    },
+    {
+        "surfaceUpdate": {
+            "surfaceId": "s1",
+            "components": [
+                {
+                    "id": "weighted",
+                    "weight": 2.0,
+                    "component": {
+                        "Column": {
+                            "children": {"explicitList": ["a", "b"]},
+                        },
+                    },
+                },
+            ],
+        },
+    },
+    {
+        "dataModelUpdate": {
+            "surfaceId": "s1",
+            "contents": [
+                {"key": "name", "valueString": "Alice"},
+                {"key": "score", "valueNumber": 42},
+                {"key": "active", "valueBoolean": True},
+            ],
+        },
+    },
+    {
+        "dataModelUpdate": {
+            "surfaceId": "s1",
+            "path": "/user",
+            "contents": [
+                {
+                    "key": "prefs",
+                    "valueMap": [
+                        {"key": "theme", "valueString": "dark"},
+                    ],
+                },
+            ],
+        },
+    },
+    {
+        "deleteSurface": {"surfaceId": "s1"},
+    },
+]
+
+# ---------------------------------------------------------------------------
+# Invalid server-to-client payloads
+# ---------------------------------------------------------------------------
+
+INVALID_SERVER_MESSAGES: list[dict[str, Any]] = [
+    {},
+    {"beginRendering": {"surfaceId": "s1"}},
+    {"surfaceUpdate": {"surfaceId": "s1", "components": []}},
+    {
+        "beginRendering": {"surfaceId": "s1", "root": "r"},
+        "deleteSurface": {"surfaceId": "s1"},
+    },
+    {"unknownType": {"surfaceId": "s1"}},
+]
+
+# ---------------------------------------------------------------------------
+# Valid client-to-server payloads
+# ---------------------------------------------------------------------------
+
+VALID_CLIENT_EVENTS: list[dict[str, Any]] = [
+    {
+        "userAction": {
+            "name": "click",
+            "surfaceId": "s1",
+            "sourceComponentId": "btn-1",
+            "timestamp": "2026-03-12T10:00:00Z",
+            "context": {},
+        },
+    },
+    {
+        "userAction": {
+            "name": "submit",
+            "surfaceId": "s1",
+            "sourceComponentId": "btn-2",
+            "timestamp": "2026-03-12T10:00:00Z",
+            "context": {"field": "value"},
+        },
+    },
+    {
+        "error": {"message": "render failed", "code": 500},
+    },
+]
+
+# ---------------------------------------------------------------------------
+# Invalid client-to-server payloads
+# ---------------------------------------------------------------------------
+
+INVALID_CLIENT_EVENTS: list[dict[str, Any]] = [
+    {},
+    {"userAction": {"name": "click"}},
+    {
+        "userAction": {
+            "name": "click",
+            "surfaceId": "s1",
+            "sourceComponentId": "btn-1",
+            "timestamp": "2026-03-12T10:00:00Z",
+            "context": {},
+        },
+        "error": {"message": "oops"},
+    },
+]
+
+# ---------------------------------------------------------------------------
+# Catalog component payloads (validated structurally)
+# ---------------------------------------------------------------------------
+
+VALID_COMPONENTS: dict[str, dict[str, Any]] = {
+    "Text": {"text": {"literalString": "hello"}, "usageHint": "h1"},
+    "Image": {"url": {"path": "/img/url"}, "fit": "cover", "usageHint": "avatar"},
+    "Icon": {"name": {"literalString": "home"}},
+    "Video": {"url": {"literalString": "https://example.com/video.mp4"}},
+    "AudioPlayer": {"url": {"literalString": "https://example.com/audio.mp3"}},
+    "Row": {"children": {"explicitList": ["a", "b"]}, "distribution": "center"},
+    "Column": {"children": {"template": {"componentId": "c1", "dataBinding": "/list"}}},
+    "List": {"children": {"explicitList": ["x"]}, "direction": "horizontal"},
+    "Card": {"child": "inner"},
+    "Tabs": {"tabItems": [{"title": {"literalString": "Tab 1"}, "child": "content"}]},
+    "Divider": {"axis": "horizontal"},
+    "Modal": {"entryPointChild": "trigger", "contentChild": "body"},
+    "Button": {"child": "label", "action": {"name": "go"}},
+    "CheckBox": {"label": {"literalString": "Accept"}, "value": {"literalBoolean": False}},
+    "TextField": {"label": {"literalString": "Name"}},
+    "DateTimeInput": {"value": {"path": "/date"}},
+    "MultipleChoice": {
+        "selections": {"literalArray": ["a"]},
+        "options": [{"label": {"literalString": "A"}, "value": "a"}],
+    },
+    "Slider": {"value": {"literalNumber": 50}, "minValue": 0, "maxValue": 100},
+}
+
+
+class TestServerToClientConformance:
+    """Pydantic models and JSON schema must agree on server-to-client messages."""
+
+    @pytest.mark.parametrize("payload", VALID_SERVER_MESSAGES)
+    def test_valid_accepted_by_both(self, payload: dict[str, Any]) -> None:
+        assert _json_schema_valid(SERVER_SCHEMA, payload), (
+            f"JSON schema rejected valid payload: {payload}"
+        )
+        assert _pydantic_valid_message(payload), (
+            f"Pydantic rejected valid payload: {payload}"
+        )
+
+    @pytest.mark.parametrize("payload", INVALID_SERVER_MESSAGES)
+    def test_invalid_rejected_by_pydantic(self, payload: dict[str, Any]) -> None:
+        assert not _pydantic_valid_message(payload), (
+            f"Pydantic accepted invalid payload: {payload}"
+        )
+
+
+class TestClientToServerConformance:
+    """Pydantic models and JSON schema must agree on client-to-server events."""
+
+    @pytest.mark.parametrize("payload", VALID_CLIENT_EVENTS)
+    def test_valid_accepted_by_both(self, payload: dict[str, Any]) -> None:
+        assert _json_schema_valid(CLIENT_SCHEMA, payload), (
+            f"JSON schema rejected valid payload: {payload}"
+        )
+        assert _pydantic_valid_event(payload), (
+            f"Pydantic rejected valid payload: {payload}"
+        )
+
+    @pytest.mark.parametrize("payload", INVALID_CLIENT_EVENTS)
+    def test_invalid_rejected_by_pydantic(self, payload: dict[str, Any]) -> None:
+        assert not _pydantic_valid_event(payload), (
+            f"Pydantic accepted invalid payload: {payload}"
+        )
+
+
+class TestCatalogConformance:
+    """Catalog component schemas and Pydantic models must define the same components."""
+
+    def test_catalog_component_names_match(self) -> None:
+        from crewai.a2a.extensions.a2ui.catalog import STANDARD_CATALOG_COMPONENTS
+
+        schema_components = set(CATALOG_SCHEMA["components"].keys())
+        assert schema_components == STANDARD_CATALOG_COMPONENTS
+
+    @pytest.mark.parametrize(
+        "name,props",
+        list(VALID_COMPONENTS.items()),
+    )
+    def test_valid_component_accepted_by_catalog_schema(
+        self, name: str, props: dict[str, Any]
+    ) -> None:
+        component_schema = CATALOG_SCHEMA["components"][name]
+        assert _json_schema_valid(component_schema, props), (
+            f"Catalog schema rejected valid {name}: {props}"
+        )
+
+    @pytest.mark.parametrize(
+        "name,props",
+        list(VALID_COMPONENTS.items()),
+    )
+    def test_valid_component_accepted_by_pydantic(
+        self, name: str, props: dict[str, Any]
+    ) -> None:
+        model_cls = getattr(catalog, name)
+        try:
+            model_cls.model_validate(props)
+        except Exception as exc:
+            pytest.fail(f"Pydantic {name} rejected valid props: {exc}")
+
+    def test_catalog_required_fields_match(self) -> None:
+        """Required fields in the JSON schema match non-optional Pydantic fields."""
+        for comp_name, comp_schema in CATALOG_SCHEMA["components"].items():
+            schema_required = set(comp_schema.get("required", []))
+            model_cls = getattr(catalog, comp_name)
+            pydantic_required = {
+                info.alias or field_name
+                for field_name, info in model_cls.model_fields.items()
+                if info.is_required()
+            }
+            assert schema_required == pydantic_required, (
+                f"{comp_name}: schema requires {schema_required}, "
+                f"Pydantic requires {pydantic_required}"
+            )
+
+    def test_catalog_fields_match(self) -> None:
+        """Field names in JSON schema match Pydantic model aliases."""
+        for comp_name, comp_schema in CATALOG_SCHEMA["components"].items():
+            schema_fields = set(comp_schema.get("properties", {}).keys())
+            model_cls = getattr(catalog, comp_name)
+            pydantic_fields = {
+                info.alias or field_name
+                for field_name, info in model_cls.model_fields.items()
+            }
+            assert schema_fields == pydantic_fields, (
+                f"{comp_name}: schema has {schema_fields}, "
+                f"Pydantic has {pydantic_fields}"
+            )

lib/crewai/tests/cassettes/test_agents_do_not_get_delegation_tools_with_there_is_only_one_agent.yaml

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lib/crewai/tests/cassettes/test_before_kickoff_callback.yaml

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lib/crewai/tests/cassettes/test_crew_with_delegating_agents.yaml

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