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Test the Agent locally

Overview​

After creating a Warden Agent, you can run it locally and interact with it using the CLI and other methods. The sections below explain how to do it.

1. Run the Agent​

  1. In a new terminal window, navigate to your Agent directory and compile TypeScript:

    npm run build

  2. Now you can run the Agent:

    npm start

    Congratulations! Your Agent is available on http://localhost:3000. While it's running, you can interact with it as shown below.

    tip

    To stop the Agent, press CTRL+C. Don't forget to rebuild it each time you update the code.

2. Interact with the Agent​

Chat using the UI​

The fastest way to make sure your Agent is running opening the local host URL:

http://localhost:3000

If everything is fine, you'll be able to chat with your Agent through the user interface provided by Warden Code:

The user interface for chatting with Agents, provided by Warden Code

Chat using the CLI​

To chat with your Agent through the CLI, take these steps:

  1. Navigate to your project's root directory and initiate Warden Code:

    warden

  2. Enter the chat mode and specify the Agent URL:

    /chat http://localhost:3000

    Alternatively, you can chat with the Agent in the build mode:

    /build
    /chat

  3. Chat with your Agent. Warden Code automatically detects whether the agent supports A2A, LangGraph, or both, and prompts you to choose when multiple protocols are available.

  4. To exit the chat mode, type this:

    /exit

Chat using the API​

Every new Agent is immediately accessible through A2A and LangGraph server endpoints exposed by Warden Code.

tip

For a full list, see A2A endpoints and LangGraph endpoints.

After running your Agent, you can try any of these endpoints locally. For example, you can prompt the Agent using the A2A POST endpoint with the send method.

In the request below, replace AGENT_API_KEY with your Agent API key for authentication, which you can find in the .env file:

POST http://localhost:3000
Headers: Content-Type: application/json
Authorization: Type: Bearer Token, Token: AGENT_API_KEY
Body:

{
  "jsonrpc": "2.0",
  "id": "",
  "method": "message/send",
  "params": {
    "message": {
      "role": "user",
      "parts": [
        {
          "kind": "text",
          "text": "What can you do?"
        }
      ],
      "messageId": ""
    },
    "thread": {
      "threadId": ""
    }
  }
}

If everything is fine, you'll receive a response including your prompt, assistant's reply, and other data:

{
    "jsonrpc": "2.0",
    "result": {
        "id": "task-2",
        "context_id": "da79d131-143c-4154-b617-c25945774648",
        "status": {
            "state": "completed",
            "timestamp": "2026-02-09T08:03:07.107Z"
        },
        "kind": "task",
        "history": [
            {
                "role": "user",
                "parts": [
                    {
                        "kind": "text",
                        "text": "What can you do?"
                    }
                ],
                "messageId": "",
                "kind": "message",
                "message_id": "5646cc50-ae72-40a9-87e6-99477e050a4f"
            },
            {
                "role": "agent",
                "parts": [
                    {
                        "kind": "text",
                        "text": "I can assist with a variety of tasks, including but not limited to:\n\n1. Answering questions and providing information on a wide range of topics.\n2. Assisting with problem-solving and brainstorming ideas.\n3. Offering writing support, including proofreading, editing, and generating text.\n4. Providing summaries and explanations of complex concepts.\n5. Helping with language translation and learning.\n6. Offering recommendations for resources, books, or tools.\n7. Engaging in casual conversation and providing companionship.\n\nIf you have a specific request or need assistance with something else, feel free to ask!"
                    }
                ],
                "kind": "message",
                "message_id": "d187905d-2ded-41e5-87ae-db02ee011d88"
            }
        ]
    },
    "id": ""
}

Check the Agent Card​

As part of the A2A protocol support, Warden Code exposes an endpoint for the A2A Agent Card, which advertises your Agent's skills. It allows other Agents and clients to discover your Agent once you publicly host it.

To check the Agent Card accessibility, run this:

http://localhost:3000/.well-known/agent-card.json

The card will display your Agent's name and capabilities, along with other information:

{
    "name": "general-test",
    "description": "A helpful AI agent named general-test",
    "url": "http://localhost:3000",
    "version": "0.1.0",
    "capabilities": {
        "streaming": true,
        "multiTurn": false
    },
    "skills": [],
    "defaultInputModes": [
        "text"
    ],
    "defaultOutputModes": [
        "text"
    ]
}
tip

You can edit the Agent Card at any time. Use the /config command or update the card directly in public/.well-known/agent-card.json.

Next steps​

After local testing, you can host your Agent to make it publicly available.