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`pydantic_ai.messages`

docs/api/messages.md

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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
(Union)") --- ModelRequest
    ModelRequest("ModelRequest(parts=list[...])") --- ModelMessage
    ModelResponsePart("ModelResponsePart
(Union)") --- ModelResponse
    ModelResponse("ModelResponse(parts=list[...])") --- ModelMessage("ModelMessage
(Union)")

::: pydantic_ai.messages