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lifespan

docs/python-sdk/fastmcp-server-mixins-lifespan.mdx

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fastmcp.server.mixins.lifespan

Lifespan infrastructure for FastMCP Server.

Classes

LifespanMixin <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/server/mixins/lifespan.py#L39" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

Mixin providing lifespan infrastructure for FastMCP.

Methods:

docket <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/server/mixins/lifespan.py#L43" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

python
docket(self: FastMCP) -> Docket | None

The Docket instance owned by this server, if the tasks extension is active.

Returns the Docket that the tasks extension initialized as the root of a runtime tree, or None when no task backend is running. Mounted children do not own their own Docket — they share the root's via _current_docket ContextVar inheritance — so accessing .docket on a mounted child returns None even while its tasks run on the root's Docket.