Playing with A2A

How do I get to use an A2A Agent in a LangGraph Supervisor setup?

Figure 1 - Diagram of today's approach

The initial idea with this here repository was to create a setup where I can play arround with A2A and MCP.

There is a docker-compose file that will start the weather-agent and a ollama container.
They are both connected - and the plan is to create a MCP server that can handle the actual weather part of the weather-agent.

Feel free to play arround and create PR's fi you would like to add more functionallity 👊

Beaware that you need UV and docker/docker-compose to get this here code working. So Install it if you do not already have it installed.

UV: https://docs.astral.sh/uv/getting-started/installation/ Docker: https://docs.docker.com/get-started/introduction/get-docker-desktop/

Now you have UV, you can now start the show. 💥

Get it working:

docker-compose up 

use crtl+c to kill the running docker-compose

detached mode:

docker-compose up -d

When the agent and the ollama has started we can use the client to access the supervisor via. chainlit.
Please reference the Client Information on how to start it etc.

Output from Docker-Compose - A2A Server.

Figure 1 - Running Supervisor

Figure 1 - Running Supervisor After

The weather agent

The tool that is added for the weather agent - uses a name from a city and try to get the weather information for that city. E.g. Copenhagen Denmark or London UK.
Output from the agent:

weather-agent_1  | INFO:weather_agent.weather_mcp_server:Weather data for SF, USA:
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Latitude: 37.78929
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Longitude: -122.42198
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Timezone: America/Los_Angeles
weather-agent_1  | INFO:weather_agent.weather_mcp_server:
weather-agent_1  | Daily Forecast:
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Date: 2025-05-20
weather-agent_1  | INFO:weather_agent.weather_mcp_server:temperature_2m_max: 20.8 °C
weather-agent_1  | INFO:weather_agent.weather_mcp_server:precipitation_sum: 0.0 mm
weather-agent_1  | INFO:weather_agent.weather_mcp_server:------------------------------------------------------------
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Date: 2025-05-21
weather-agent_1  | INFO:weather_agent.weather_mcp_server:temperature_2m_max: 22.2 °C
weather-agent_1  | INFO:weather_agent.weather_mcp_server:precipitation_sum: 0.0 mm
weather-agent_1  | INFO:weather_agent.weather_mcp_server:------------------------------------------------------------
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Date: 2025-05-22
weather-agent_1  | INFO:weather_agent.weather_mcp_server:temperature_2m_max: 16.7 °C
weather-agent_1  | INFO:weather_agent.weather_mcp_server:precipitation_sum: 0.0 mm
weather-agent_1  | INFO:weather_agent.weather_mcp_server:------------------------------------------------------------
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Date: 2025-05-23
weather-agent_1  | INFO:weather_agent.weather_mcp_server:temperature_2m_max: 15.8 °C
weather-agent_1  | INFO:weather_agent.weather_mcp_server:precipitation_sum: 0.0 mm
weather-agent_1  | INFO:weather_agent.weather_mcp_server:------------------------------------------------------------
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Date: 2025-05-24
weather-agent_1  | INFO:weather_agent.weather_mcp_server:temperature_2m_max: 20.4 °C
weather-agent_1  | INFO:weather_agent.weather_mcp_server:precipitation_sum: 0.0 mm
weather-agent_1  | INFO:weather_agent.weather_mcp_server:------------------------------------------------------------
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Date: 2025-05-25
weather-agent_1  | INFO:weather_agent.weather_mcp_server:temperature_2m_max: 16.7 °C
weather-agent_1  | INFO:weather_agent.weather_mcp_server:precipitation_sum: 0.0 mm
weather-agent_1  | INFO:weather_agent.weather_mcp_server:------------------------------------------------------------
weather-agent_1  | INFO:weather_agent.weather_mcp_server:Date: 2025-05-26
weather-agent_1  | INFO:weather_agent.weather_mcp_server:temperature_2m_max: 16.7 °C
weather-agent_1  | INFO:weather_agent.weather_mcp_server:precipitation_sum: 0.0 mm
weather-agent_1  | INFO:weather_agent.weather_mcp_server:------------------------------------------------------------

To-do's:

• Make the last part of the weather-agent - Tool that can handle the weather part of things
• Make a MCP Server for MySQL that can be used to store the output from the weather-agent
• Write better documentation
• Make a client that can be used instead of the A2A Google CLI