mcp-run-python

# `pydantic_ai.messages` The structure of [`ModelMessage`][pydantic_ai.messages.ModelMessage] can be shown as a graph: ```mermaid graph RL SystemPromptPart(SystemPromptPart) --- ModelRequestPart UserPromptPart(UserPromptPart) --- ModelRequestPart ToolReturnPart(ToolReturnPart) --- ModelRequestPart RetryPromptPart(RetryPromptPart) --- ModelRequestPart TextPart(TextPart) --- ModelResponsePart ToolCallPart(ToolCallPart) --- ModelResponsePart ThinkingPart(ThinkingPart) --- ModelResponsePart ModelRequestPart("ModelRequestPart<br>(Union)") --- ModelRequest ModelRequest("ModelRequest(parts=list[...])") --- ModelMessage ModelResponsePart("ModelResponsePart<br>(Union)") --- ModelResponse ModelResponse("ModelResponse(parts=list[...])") --- ModelMessage("ModelMessage<br>(Union)") ``` ::: pydantic_ai.messages