> ## 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.

# Agno AgentOS A2A Server for testing A2AClient

> This server uses Agno's AgentOS to create an A2A-compatible agent that can be tested with A2AClient.

```python agno_server.py theme={null}
"""Agno AgentOS A2A Server for testing A2AClient.

This server uses Agno's AgentOS to create an A2A-compatible
agent that can be tested with A2AClient.

Prerequisites:
    export OPENAI_API_KEY=your_key

Usage:
    python cookbook/05_agent_os/client_a2a/servers/agno_server.py

The server will start at http://localhost:7003
"""

from agno.agent.agent import Agent
from agno.db.sqlite import SqliteDb
from agno.models.openai import OpenAIChat
from agno.os import AgentOS

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

db = SqliteDb(db_file="tmp/agent.db")
chat_agent = Agent(
    name="basic-agent",
    model=OpenAIChat(id="gpt-5.2"),
    id="basic-agent",
    db=db,
    description="A helpful AI assistant that provides thoughtful answers.",
    instructions="You are a helpful AI assistant.",
    add_datetime_to_context=True,
    add_history_to_context=True,
    markdown=True,
)

agent_os = AgentOS(
    agents=[chat_agent],
    a2a_interface=True,
)
app = agent_os.get_app()


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

if __name__ == "__main__":
    agent_os.serve(app="agno_server:app", reload=True, port=7003)
```

## Run the Example

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

  <Step title="Install dependencies">
    ```bash theme={null}
    uv pip install -U "agno[a2a,os]" openai
    ```
  </Step>

  <Step title="Export your OpenAI API key">
    <CodeGroup>
      ```bash Mac/Linux theme={null}
      export OPENAI_API_KEY="your_openai_api_key_here"
      ```

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

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

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

Full source: [cookbook/05\_agent\_os/client\_a2a/servers/agno\_server.py](https://github.com/agno-agi/agno/blob/main/cookbook/05_agent_os/client_a2a/servers/agno_server.py)