fix: Anthropic extended thinking with tool use and minor fixes

.gitignore

@@ -1,5 +1,5 @@
 site
-.venv
+.venv*
 dist
 __pycache__
 .env
@@ -11,7 +11,7 @@ env*/
 /postgres-data/
 .DS_Store
 examples/pydantic_ai_examples/.chat_app_messages.sqlite
-.cache/
+*cache/
 .vscode/
 /question_graph_history.json
 /docs-site/.wrangler/

CLAUDE.md

@@ -26,7 +26,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ### Core Components
 
-**Agent System (`pydantic_ai_slim/pydantic_ai/agent.py`)**
+**Agent System (`pydantic_ai_slim/pydantic_ai/agent/`)**
 - `Agent[AgentDepsT, OutputDataT]`: Main orchestrator class with generic types for dependency injection and output validation
 - Entry points: `run()`, `run_sync()`, `run_stream()` methods
 - Handles tool management, system prompts, and model interaction

pydantic_ai_slim/pydantic_ai/models/anthropic.py

@@ -247,12 +247,29 @@ async def _messages_create(
         tools = self._get_tools(model_request_parameters)
         tools += self._get_builtin_tools(model_request_parameters)
         tool_choice: BetaToolChoiceParam | None
+        thinking = model_settings.get('anthropic_thinking', NOT_GIVEN)
+        temperature = model_settings.get('temperature', NOT_GIVEN)
+        top_p = model_settings.get('top_p', NOT_GIVEN)
 
         if not tools:
             tool_choice = None
         else:
             if not model_request_parameters.allow_text_output:
                 tool_choice = {'type': 'any'}
+                if thinking and thinking.get('type') == 'enabled':
+                    tool_choice = {'type': 'auto'}
+                    if temperature and temperature != 1:
+                        warnings.warn(
+                            'Anthropic only allows temperature set to 1 or not given, if thinking enabled using 1 for now',
+                            UserWarning,
+                        )
+                        temperature = 1
+                    if top_p and top_p < 0.95:
+                        warnings.warn(
+                            'Anthropic only allows top_p greater than or equal to 0.95 or not given, if thinking enabled using 0.95 for now',
+                            UserWarning,
+                        )
+                        top_p = 0.95
             else:
                 tool_choice = {'type': 'auto'}
 
@@ -273,10 +290,10 @@ async def _messages_create(
                 tools=tools or NOT_GIVEN,
                 tool_choice=tool_choice or NOT_GIVEN,
                 stream=stream,
-                thinking=model_settings.get('anthropic_thinking', NOT_GIVEN),
+                thinking=thinking,
                 stop_sequences=model_settings.get('stop_sequences', NOT_GIVEN),
-                temperature=model_settings.get('temperature', NOT_GIVEN),
-                top_p=model_settings.get('top_p', NOT_GIVEN),
+                temperature=temperature,
+                top_p=top_p,
                 timeout=model_settings.get('timeout', NOT_GIVEN),
                 metadata=model_settings.get('anthropic_metadata', NOT_GIVEN),
                 extra_headers=extra_headers,