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

# Basic Agent Factory -- per-tenant agent construction

> Demonstrates the simplest factory pattern: a callable that receives a RequestContext and returns a fresh Agent with tenant-specific instructions.

```python basic_factory.py theme={null}
"""Basic Agent Factory -- per-tenant agent construction.

Demonstrates the simplest factory pattern: a callable that receives a
RequestContext and returns a fresh Agent with tenant-specific instructions.

Run:
    .venvs/demo/bin/python cookbook/05_agent_os/factories/agent/01_basic_factory.py

Test:
    # List agents (factory shows up with is_factory: true)
    curl http://localhost:7777/agents

    # Run the factory agent
    curl -X POST http://localhost:7777/agents/tenant-agent/runs \
        -F 'message=Hello, who are you?' \
        -F 'user_id=tenant_42' \
        -F 'stream=false'
"""

from agno.agent import Agent, AgentFactory
from agno.db.postgres import PostgresDb
from agno.factory import RequestContext
from agno.models.openai import OpenAIResponses
from agno.os import AgentOS

# ---------------------------------------------------------------------------
# Database
# ---------------------------------------------------------------------------

db = PostgresDb(
    id="factory-demo-db",
    db_url="postgresql+psycopg://ai:ai@localhost:5532/ai",
)

# ---------------------------------------------------------------------------
# Factory: build a per-tenant agent
# ---------------------------------------------------------------------------


def build_tenant_agent(ctx: RequestContext) -> Agent:
    """Called on every request. Returns a fresh Agent for the calling tenant."""
    user_id = ctx.user_id or "anonymous"
    return Agent(
        model=OpenAIResponses(id="gpt-5.4"),
        db=db,
        instructions=f"You are a helpful assistant for tenant {user_id}. Be concise.",
        add_datetime_to_context=True,
        markdown=True,
    )


tenant_factory = AgentFactory(
    db=db,
    id="tenant-agent",
    name="Per-tenant assistant",
    description="Builds a personalized agent per tenant on each request",
    factory=build_tenant_agent,
)

# ---------------------------------------------------------------------------
# A normal (prototype) agent alongside the factory
# ---------------------------------------------------------------------------

static_agent = Agent(
    id="support-agent",
    name="Support Agent",
    model=OpenAIResponses(id="gpt-5.4"),
    db=db,
    instructions="You are a general support agent. Be concise.",
    markdown=True,
)

# ---------------------------------------------------------------------------
# AgentOS -- factories and prototypes coexist
# ---------------------------------------------------------------------------

agent_os = AgentOS(
    id="factory-basic-demo",
    description="Demo: basic agent factory alongside a static agent",
    agents=[static_agent, tenant_factory],
)
app = agent_os.get_app()

# ---------------------------------------------------------------------------
# Run
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    agent_os.serve(app="01_basic_factory:app", port=7777, reload=True)
```

## Run the Example

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

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

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

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

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

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

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

Full source: [cookbook/05\_agent\_os/factories/agent/01\_basic\_factory.py](https://github.com/agno-agi/agno/blob/main/cookbook/05_agent_os/factories/agent/01_basic_factory.py)