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754fb01088Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
145 lines
4.7 KiB
Text
145 lines
4.7 KiB
Text
---
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title: base
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sidebarTitle: base
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---
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# `fastmcp.prompts.base`
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Base classes for FastMCP prompts.
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## Classes
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### `Message` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L43" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Wrapper for prompt message with auto-serialization.
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Accepts any content - strings pass through, other types
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(dict, list, BaseModel) are JSON-serialized to text.
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**Methods:**
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#### `to_mcp_prompt_message` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L98" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_mcp_prompt_message(self) -> PromptMessage
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```
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Convert to MCP PromptMessage.
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### `PromptArgument` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L103" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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An argument that can be passed to a prompt.
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### `PromptResult` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L115" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Canonical result type for prompt rendering.
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Provides explicit control over prompt responses: multiple messages,
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roles, and metadata at both the message and result level.
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**Methods:**
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#### `to_mcp_prompt_result` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L187" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_mcp_prompt_result(self) -> GetPromptResult
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```
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Convert to MCP GetPromptResult.
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### `Prompt` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L197" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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A prompt template that can be rendered with parameters.
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**Methods:**
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#### `to_mcp_prompt` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L209" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_mcp_prompt(self, **overrides: Any) -> SDKPrompt
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```
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Convert the prompt to an MCP prompt.
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#### `from_function` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L235" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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from_function(cls, fn: Callable[..., Any]) -> FunctionPrompt
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```
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Create a Prompt from a function.
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The function can return:
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- str: wrapped as single user Message
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- list\[Message | str]: converted to list\[Message]
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- PromptResult: used directly
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#### `render` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L271" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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render(self, arguments: dict[str, Any] | None = None) -> str | list[Message | str] | PromptResult
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```
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Render the prompt with arguments.
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Subclasses must implement this method. Return one of:
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- str: Wrapped as single user Message
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- list\[Message | str]: Converted to list\[Message]
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- PromptResult: Used directly
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#### `convert_result` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L284" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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convert_result(self, raw_value: Any) -> PromptResult
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```
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Convert a raw return value to PromptResult.
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**Raises:**
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- `TypeError`: for unsupported types
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#### `register_with_docket` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L374" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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register_with_docket(self, docket: Docket) -> None
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```
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Register this prompt with docket for background execution.
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#### `add_to_docket` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L380" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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add_to_docket(self, docket: Docket, arguments: dict[str, Any] | None, **kwargs: Any) -> Execution
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```
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Schedule this prompt for background execution via docket.
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**Args:**
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- `docket`: The Docket instance
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- `arguments`: Prompt arguments
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- `fn_key`: Function lookup key in Docket registry (defaults to self.key)
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- `task_key`: Redis storage key for the result
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- `**kwargs`: Additional kwargs passed to docket.add()
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#### `get_span_attributes` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/prompts/base.py#L403" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_span_attributes(self) -> dict[str, Any]
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```
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