fastmcp/docs/python-sdk/fastmcp-server-mixins-lifespan.mdx
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---
title: lifespan
sidebarTitle: lifespan
---
# `fastmcp.server.mixins.lifespan`
Lifespan and Docket task infrastructure for FastMCP Server.
## Classes
### `LifespanMixin` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/mixins/lifespan.py#L25" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
Mixin providing lifespan and Docket task infrastructure for FastMCP.
**Methods:**
#### `docket` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/mixins/lifespan.py#L29" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
docket(self: FastMCP) -> Docket | None
```
Get the Docket instance if Docket support is enabled.
Returns None if Docket is not enabled or server hasn't been started yet.