# lifespans

> Lifespans let you run code once when the server starts and clean up when it stops. Unlike per-session handlers, lifespans run exactly once regardless of ho

- Source: https://doutorai.pt/en/components/skills__lifespans
- Type: Skills
- Category: Development
- Downloads: 0
- Site: Doutor AI (https://doutorai.pt/en) - AI tools for small businesses

An open-source community component, curated and adapted by Doutor AI.

## What it does and how to use it

A **skill** that teaches Claude Code to do development tasks well. It is packaged knowledge the model uses whenever it is relevant.

1. Install the skill (command above).
2. In Claude Code, describe what you need - the skill turns on by itself when the context fits.
3. No commands to memorize: you talk in plain language and the skill does the rest.

## Install (Claude Code)

```bash
mkdir -p .claude/skills/lifespans && curl -fsSL https://doutorai.pt/data/lib/skills__lifespans.md -o .claude/skills/lifespans/SKILL.md
```

Paste this command into the terminal, in your project folder, and the component installs automatically.

## Content

````
# Lifespans

> Server-level setup and teardown with composable lifespans

Lifespans let you run code once when the server starts and clean up when it stops. Unlike per-session handlers, lifespans run exactly once regardless of how many clients connect.

## Basic Usage

Use the `@lifespan` decorator to define a lifespan:

```python
from fastmcp import FastMCP
from fastmcp.server.lifespan import lifespan

@lifespan
async def app_lifespan(server):
    # Setup: runs once when server starts
    print("Starting up...")
    try:
        yield {"started_at": "2024-01-01"}
    finally:
        # Teardo

- 🔒 Full content on the Pro plan (€7.99/month) -
````

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Content by Doutor AI (https://doutorai.pt/en). When quoting, please cite the source: https://doutorai.pt/en/components/skills__lifespans