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108 lines
4.7 KiB
Text
108 lines
4.7 KiB
Text
---
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title: low_level
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sidebarTitle: low_level
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---
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# `fastmcp.server.low_level`
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## Classes
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### `MiddlewareServerSession` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L36" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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ServerSession that routes initialization requests through FastMCP middleware.
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**Methods:**
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#### `fastmcp` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L48" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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fastmcp(self) -> FastMCP
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```
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Get the FastMCP instance.
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#### `client_supports_extension` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L55" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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client_supports_extension(self, extension_id: str) -> bool
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```
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Check if the connected client supports a given MCP extension.
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Inspects the ``extensions`` extra field on ``ClientCapabilities``
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sent by the client during initialization.
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### `LowLevelServer` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L155" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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**Methods:**
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#### `fastmcp` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L169" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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fastmcp(self) -> FastMCP
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```
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Get the FastMCP instance.
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#### `create_initialization_options` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L176" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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create_initialization_options(self, notification_options: NotificationOptions | None = None, experimental_capabilities: dict[str, dict[str, Any]] | None = None, **kwargs: Any) -> InitializationOptions
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```
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#### `get_capabilities` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L191" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_capabilities(self, notification_options: NotificationOptions, experimental_capabilities: dict[str, dict[str, Any]]) -> mcp.types.ServerCapabilities
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```
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Override to set capabilities.tasks as a first-class field per SEP-1686.
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This ensures task capabilities appear in capabilities.tasks instead of
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capabilities.experimental.tasks, which is required by the MCP spec and
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enables proper task detection by clients like VS Code Copilot 1.107+.
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#### `run` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L225" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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run(self, read_stream: MemoryObjectReceiveStream[SessionMessage | Exception], write_stream: MemoryObjectSendStream[SessionMessage], initialization_options: InitializationOptions, raise_exceptions: bool = False, stateless: bool = False)
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```
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Overrides the run method to use the MiddlewareServerSession.
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#### `read_resource` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L261" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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read_resource(self) -> Callable[[Callable[[AnyUrl], Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult]]], Callable[[AnyUrl], Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult]]]
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```
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Decorator for registering a read_resource handler with CreateTaskResult support.
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The MCP SDK's read_resource decorator does not support returning CreateTaskResult
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for background task execution. This decorator wraps the result in ServerResult.
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This decorator can be removed once the MCP SDK adds native CreateTaskResult support
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for resources.
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#### `get_prompt` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/low_level.py#L305" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_prompt(self) -> Callable[[Callable[[str, dict[str, Any] | None], Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult]]], Callable[[str, dict[str, Any] | None], Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult]]]
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```
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Decorator for registering a get_prompt handler with CreateTaskResult support.
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The MCP SDK's get_prompt decorator does not support returning CreateTaskResult
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for background task execution. This decorator wraps the result in ServerResult.
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This decorator can be removed once the MCP SDK adds native CreateTaskResult support
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for prompts.
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