Mount Multiple AG-UI Instances

Expose two agents from one AgentOS under independent AG-UI prefixes. Each prefix receives its own POST /agui and GET /status routes.

multiple_instances.py

"""
Mount Multiple AG-UI Instances
==============================

Expose two agents from one AgentOS under independent AG-UI prefixes. Each
prefix receives its own POST /agui and GET /status routes.

Prerequisites: OPENAI_API_KEY
Run: .venvs/demo/bin/python cookbook/05_agent_os/16_agui/multiple_instances.py
Try: Compare POST /chat/agui with POST /analyst/agui on localhost:7777
"""

from agno.agent import Agent
from agno.db.sqlite import SqliteDb
from agno.models.openai import OpenAIResponses
from agno.os import AgentOS
from agno.os.interfaces.agui import AGUI

# ---------------------------------------------------------------------------
# Create Agents and Interface Mounts
# ---------------------------------------------------------------------------

db = SqliteDb(
    id="agui-multiple-db",
    db_file="tmp/agui_multiple.db",
)

chat_agent = Agent(
    id="agui-chat-agent",
    name="AG-UI Chat Agent",
    model=OpenAIResponses(id="gpt-5.5"),
    db=db,
    instructions="Answer conversational questions in one or two sentences.",
)

analyst_agent = Agent(
    id="agui-analyst-agent",
    name="AG-UI Analyst Agent",
    model=OpenAIResponses(id="gpt-5.5"),
    db=db,
    instructions="Answer with three labeled analytical points.",
)

agent_os = AgentOS(
    id="agui-multiple-os",
    description="Two independently addressable AG-UI interfaces.",
    agents=[chat_agent, analyst_agent],
    interfaces=[
        AGUI(agent=chat_agent, prefix="/chat"),
        AGUI(agent=analyst_agent, prefix="/analyst"),
    ],
)
app = agent_os.get_app()

# ---------------------------------------------------------------------------
# Run Multi-Interface Server
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    agent_os.serve(app=app)

Run the Example

Set up your virtual environment

uv venv --python 3.12
source .venv/bin/activate

Install dependencies

uv pip install -U "agno[agui,os]" openai

Export your OpenAI API key

export OPENAI_API_KEY="your_openai_api_key_here"

Run the example

Save the code above as multiple_instances.py, then run:

python multiple_instances.py

The same request can be sent to /analyst/agui to select the second agent. Use distinct thread IDs when comparing independent conversations.

Send a request

With the server running in another terminal:

Save this complete AG-UI request as agui-input.json. Replace content with the prompt for this example. Use a fresh runId for each run; keep threadId only when continuing the same session.

agui-input.json

{
  "threadId": "example-thread-1",
  "runId": "example-run-1",
  "state": {},
  "messages": [
    {"id": "example-message-1", "role": "user", "content": "Hello"}
  ],
  "tools": [],
  "context": [],
  "forwardedProps": {}
}

The endpoint accepts this object, rather than a JSON string or the REST run endpoint's message form field. The response is an SSE stream whose data values are AG-UI event objects. Inspect RUN_ERROR and RUN_FINISHED events; an HTTP 200 only establishes that the stream opened.

curl --no-buffer -H "Content-Type: application/json" --data-binary @agui-input.json http://localhost:7777/chat/agui

Full source: cookbook/05_agent_os/16_agui/multiple_instances.py