chore: refactor parser & constants, improve tools_handler, update tests

- Move parser constants to dedicated module with pre-compiled regex
- Refactor CrewAgentParser to module functions; remove unused params
- Improve tools_handler with instance attributes
- Update tests to use module-level parser functions

src/crewai/utilities/agent_utils.py

@@ -2,12 +2,12 @@ import json
 import re
 from typing import Any, Callable, Dict, List, Optional, Sequence, Union
 
+from crewai.agents.constants import FINAL_ANSWER_AND_PARSABLE_ACTION_ERROR_MESSAGE
 from crewai.agents.parser import (
-    FINAL_ANSWER_AND_PARSABLE_ACTION_ERROR_MESSAGE,
     AgentAction,
     AgentFinish,
-    CrewAgentParser,
     OutputParserException,
+    parse,
 )
 from crewai.llm import LLM
 from crewai.llms.base_llm import BaseLLM
@@ -25,6 +25,7 @@ from crewai.cli.config import Settings
 
 console = Console()
 
+
 def parse_tools(tools: List[BaseTool]) -> List[CrewStructuredTool]:
     """Parse tools to be used for the task."""
     tools_list = []
@@ -122,7 +123,7 @@ def format_message_for_llm(prompt: str, role: str = "user") -> Dict[str, str]:
 def format_answer(answer: str) -> Union[AgentAction, AgentFinish]:
     """Format a response from the LLM into an AgentAction or AgentFinish."""
     try:
-        return CrewAgentParser.parse_text(answer)
+        return parse(answer)
     except Exception:
         # If parsing fails, return a default AgentFinish
         return AgentFinish(
@@ -446,9 +447,16 @@ def show_agent_logs(
 def _print_current_organization():
     settings = Settings()
     if settings.org_uuid:
-        console.print(f"Fetching agent from organization: {settings.org_name} ({settings.org_uuid})", style="bold blue")
+        console.print(
+            f"Fetching agent from organization: {settings.org_name} ({settings.org_uuid})",
+            style="bold blue",
+        )
     else:
-        console.print("No organization currently set. We recommend setting one before using: `crewai org switch <org_id>` command.", style="yellow")
+        console.print(
+            "No organization currently set. We recommend setting one before using: `crewai org switch <org_id>` command.",
+            style="yellow",
+        )
+
 
 def load_agent_from_repository(from_repository: str) -> Dict[str, Any]:
     attributes: Dict[str, Any] = {}