---
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.