This commit is contained in:
Brandon Hancock
2025-03-28 10:28:15 -04:00
parent 0ec3c37912
commit b8c8640f22
6 changed files with 211 additions and 16 deletions

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@@ -48,8 +48,6 @@ class ExampleFlow(Flow):
], ],
) )
#TODO: NEED TO ADD AN EXAMPLE AGENT IN HERE AS WELL.
random_city = response["choices"][0]["message"]["content"] random_city = response["choices"][0]["message"]["content"]
# Store the city in our state # Store the city in our state
self.state["city"] = random_city self.state["city"] = random_city
@@ -547,6 +545,97 @@ The `third_method` and `fourth_method` listen to the output of the `second_metho
When you run this Flow, the output will change based on the random boolean value generated by the `start_method`. When you run this Flow, the output will change based on the random boolean value generated by the `start_method`.
## Adding LiteAgent to Flows
LiteAgents can be seamlessly integrated into your flows, providing a lightweight alternative to full Crews when you need simpler, focused task execution. Here's an example of how to use a LiteAgent within a flow to perform market research:
```python
from typing import List, cast
from crewai_tools.tools.website_search.website_search_tool import WebsiteSearchTool
from pydantic import BaseModel, Field
from crewai.flow.flow import Flow, listen, start
from crewai.lite_agent import LiteAgent
# Define a structured output format
class MarketAnalysis(BaseModel):
key_trends: List[str] = Field(description="List of identified market trends")
market_size: str = Field(description="Estimated market size")
competitors: List[str] = Field(description="Major competitors in the space")
# Define flow state
class MarketResearchState(BaseModel):
product: str = ""
analysis: MarketAnalysis | None = None
class MarketResearchFlow(Flow[MarketResearchState]):
@start()
def initialize_research(self):
print(f"Starting market research for {self.state.product}")
@listen(initialize_research)
def analyze_market(self):
# Create a LiteAgent for market research
analyst = LiteAgent(
role="Market Research Analyst",
goal=f"Analyze the market for {self.state.product}",
backstory="You are an experienced market analyst with expertise in "
"identifying market trends and opportunities.",
llm="gpt-4o",
tools=[WebsiteSearchTool()],
verbose=True,
response_format=MarketAnalysis,
)
# Define the research query
query = f"""
Research the market for {self.state.product}. Include:
1. Key market trends
2. Market size
3. Major competitors
Format your response according to the specified structure.
"""
# Execute the analysis
result = analyst.kickoff(query)
self.state.analysis = cast(MarketAnalysis, result.pydantic)
return result.pydantic
@listen(analyze_market)
def present_results(self):
analysis = self.state.analysis
if analysis is None:
print("No analysis results available")
return
print("\nMarket Analysis Results")
print("=====================")
print("\nKey Market Trends:")
for trend in analysis.key_trends:
print(f"- {trend}")
print(f"\nMarket Size: {analysis.market_size}")
print("\nMajor Competitors:")
for competitor in analysis.competitors:
print(f"- {competitor}")
# Usage example
flow = MarketResearchFlow()
result = flow.kickoff(inputs={"product": "AI-powered chatbots"})
```
This example demonstrates several key features of using LiteAgents in flows:
1. **Structured Output**: Using Pydantic models to define the expected output format (`MarketAnalysis`) ensures type safety and structured data throughout the flow.
2. **State Management**: The flow state (`MarketResearchState`) maintains context between steps and stores both inputs and outputs.
3. **Tool Integration**: LiteAgents can use tools (like `WebsiteSearchTool`) to enhance their capabilities.
If you want to learn more about LiteAgents, check out the [LiteAgent](/concepts/lite-agent) page.
## Adding Crews to Flows ## Adding Crews to Flows
Creating a flow with multiple crews in CrewAI is straightforward. Creating a flow with multiple crews in CrewAI is straightforward.

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@@ -26,7 +26,67 @@ Think of a LiteAgent as a specialized worker that excels at individual tasks. Wh
## Creating a LiteAgent ## Creating a LiteAgent
Here's a simple example of creating and using a LiteAgent in a flow: Here's a simple example of creating and using a standalone LiteAgent:
```python
from typing import List, cast
from crewai_tools.tools.website_search.website_search_tool import WebsiteSearchTool
from pydantic import BaseModel, Field
from crewai.lite_agent import LiteAgent
# Define a structured output format
class MovieReview(BaseModel):
title: str = Field(description="The title of the movie")
rating: float = Field(description="Rating out of 10")
pros: List[str] = Field(description="List of positive aspects")
cons: List[str] = Field(description="List of negative aspects")
# Create a LiteAgent
critic = LiteAgent(
role="Movie Critic",
goal="Provide insightful movie reviews",
backstory="You are an experienced film critic known for balanced, thoughtful reviews.",
tools=[WebsiteSearchTool()],
verbose=True,
response_format=MovieReview,
)
# Use the agent
query = """
Review the movie 'Inception'. Include:
1. Your rating out of 10
2. Key positive aspects
3. Areas that could be improved
"""
result = critic.kickoff(query)
# Access the structured output
review = cast(MovieReview, result.pydantic)
print(f"\nMovie Review: {review.title}")
print(f"Rating: {review.rating}/10")
print("\nPros:")
for pro in review.pros:
print(f"- {pro}")
print("\nCons:")
for con in review.cons:
print(f"- {con}")
```
This example demonstrates the core features of a LiteAgent:
- Structured output using Pydantic models
- Tool integration with WebSearchTool
- Simple execution with `kickoff()`
- Easy access to both raw and structured results
## Using LiteAgent in a Flow
For more complex scenarios, you can integrate LiteAgents into a Flow. Here's an example of a market research flow:
```python ```python
from typing import List from typing import List

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@@ -20,7 +20,6 @@ class MarketResearchState(BaseModel):
analysis: MarketAnalysis | None = None analysis: MarketAnalysis | None = None
# Create a flow class
class MarketResearchFlow(Flow[MarketResearchState]): class MarketResearchFlow(Flow[MarketResearchState]):
@start() @start()
def initialize_research(self): def initialize_research(self):

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@@ -0,0 +1,46 @@
from typing import List, cast
from crewai_tools.tools.website_search.website_search_tool import WebsiteSearchTool
from pydantic import BaseModel, Field
from crewai.lite_agent import LiteAgent
# Define a structured output format
class MovieReview(BaseModel):
title: str = Field(description="The title of the movie")
rating: float = Field(description="Rating out of 10")
pros: List[str] = Field(description="List of positive aspects")
cons: List[str] = Field(description="List of negative aspects")
# Create a LiteAgent
critic = LiteAgent(
role="Movie Critic",
goal="Provide insightful movie reviews",
backstory="You are an experienced film critic known for balanced, thoughtful reviews.",
tools=[WebsiteSearchTool()],
verbose=True,
response_format=MovieReview,
)
# Use the agent
query = """
Review the movie 'Inception'. Include:
1. Your rating out of 10
2. Key positive aspects
3. Areas that could be improved
"""
result = critic.kickoff(query)
# Access the structured output
review = cast(MovieReview, result.pydantic)
print(f"\nMovie Review: {review.title}")
print(f"Rating: {review.rating}/10")
print("\nPros:")
for pro in review.pros:
print(f"- {pro}")
print("\nCons:")
for con in review.cons:
print(f"- {con}")

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@@ -87,7 +87,18 @@ class CrewAgentParser:
r"Action\s*\d*\s*:[\s]*(.*?)[\s]*Action\s*\d*\s*Input\s*\d*\s*:[\s]*(.*)" r"Action\s*\d*\s*:[\s]*(.*?)[\s]*Action\s*\d*\s*Input\s*\d*\s*:[\s]*(.*)"
) )
action_match = re.search(regex, text, re.DOTALL) action_match = re.search(regex, text, re.DOTALL)
if action_match: if includes_answer:
final_answer = text.split(FINAL_ANSWER_ACTION)[-1].strip()
# Check whether the final answer ends with triple backticks.
if final_answer.endswith("```"):
# Count occurrences of triple backticks in the final answer.
count = final_answer.count("```")
# If count is odd then it's an unmatched trailing set; remove it.
if count % 2 != 0:
final_answer = final_answer[:-3].rstrip()
return AgentFinish(thought, final_answer, text)
elif action_match:
if includes_answer: if includes_answer:
raise OutputParserException( raise OutputParserException(
f"{FINAL_ANSWER_AND_PARSABLE_ACTION_ERROR_MESSAGE}" f"{FINAL_ANSWER_AND_PARSABLE_ACTION_ERROR_MESSAGE}"
@@ -102,17 +113,6 @@ class CrewAgentParser:
return AgentAction(thought, clean_action, safe_tool_input, text) return AgentAction(thought, clean_action, safe_tool_input, text)
elif includes_answer:
final_answer = text.split(FINAL_ANSWER_ACTION)[-1].strip()
# Check whether the final answer ends with triple backticks.
if final_answer.endswith("```"):
# Count occurrences of triple backticks in the final answer.
count = final_answer.count("```")
# If count is odd then it's an unmatched trailing set; remove it.
if count % 2 != 0:
final_answer = final_answer[:-3].rstrip()
return AgentFinish(thought, final_answer, text)
if not re.search(r"Action\s*\d*\s*:[\s]*(.*?)", text, re.DOTALL): if not re.search(r"Action\s*\d*\s*:[\s]*(.*?)", text, re.DOTALL):
raise OutputParserException( raise OutputParserException(
f"{MISSING_ACTION_AFTER_THOUGHT_ERROR_MESSAGE}\n{self._i18n.slice('final_answer_format')}", f"{MISSING_ACTION_AFTER_THOUGHT_ERROR_MESSAGE}\n{self._i18n.slice('final_answer_format')}",

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@@ -395,6 +395,7 @@ class LiteAgent(BaseModel):
callbacks=self._callbacks, callbacks=self._callbacks,
printer=self._printer, printer=self._printer,
) )
# Emit LLM call completed event # Emit LLM call completed event
crewai_event_bus.emit( crewai_event_bus.emit(
self, self,