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.
- Skills
- Development
- 0
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.
- Install the skill (command above).
- In Claude Code, describe what you need - the skill turns on by itself when the context fits.
- No commands to memorize: you talk in plain language and the skill does the rest.
Install (Claude Code)
mkdir -p .claude/skills/lifespans && curl -fsSL https://doutorai.pt/data/lib/skills__lifespans.md -o .claude/skills/lifespans/SKILL.mdPaste 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:
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