> ## Documentation Index
> Fetch the complete documentation index at: https://phidatainc.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Lifespan

> Pass an asynccontextmanager lifespan to AgentOS to run startup and shutdown hooks around the FastAPI app.

Example AgentOS app where the agent has a custom lifespan.

```python custom_lifespan.py theme={null}
"""
Example AgentOS app where the agent has a custom lifespan.
"""

from contextlib import asynccontextmanager

from agno.agent import Agent
from agno.db.postgres import PostgresDb
from agno.models.anthropic import Claude
from agno.os import AgentOS
from agno.utils.log import log_info

# ---------------------------------------------------------------------------
# Create Example
# ---------------------------------------------------------------------------

# Setup the database
db = PostgresDb(db_url="postgresql+psycopg://ai:ai@localhost:5532/ai")

# Setup basic agents, teams and workflows
agno_support_agent = Agent(
    id="example-agent",
    name="Example Agent",
    model=Claude(id="claude-sonnet-4-5"),
    db=db,
    markdown=True,
)


@asynccontextmanager
async def lifespan(app):
    log_info("Starting My FastAPI App")
    yield
    log_info("Stopping My FastAPI App")


agent_os = AgentOS(
    description="Example app with custom lifespan",
    agents=[agno_support_agent],
    lifespan=lifespan,
)


app = agent_os.get_app()

# ---------------------------------------------------------------------------
# Run Example
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    """Run your AgentOS.

    You can see test your AgentOS at:
    http://localhost:7777/docs

    """
    # Don't use reload=True here, this can cause issues with the lifespan
    agent_os.serve(app="custom_lifespan:app")
```

## Run the Example

<Steps>
  <Snippet file="create-venv-step.mdx" />

  <Step title="Install dependencies">
    ```bash theme={null}
    uv pip install -U "agno[os]" "psycopg[binary]" anthropic
    ```
  </Step>

  <Step title="Export your Anthropic API key">
    <CodeGroup>
      ```bash Mac/Linux theme={null}
      export ANTHROPIC_API_KEY="your_anthropic_api_key_here"
      ```

      ```bash Windows theme={null}
      $Env:ANTHROPIC_API_KEY="your_anthropic_api_key_here"
      ```
    </CodeGroup>
  </Step>

  <Snippet file="run-pgvector-step.mdx" />

  <Step title="Run the example">
    Save the code above as `custom_lifespan.py`, then run:

    ```bash theme={null}
    python custom_lifespan.py
    ```
  </Step>
</Steps>

Full source: [cookbook/05\_agent\_os/customize/custom\_lifespan.py](https://github.com/agno-agi/agno/blob/main/cookbook/05_agent_os/customize/custom_lifespan.py)