---
title: "Invoke Agent A2A"
method: POST
path: "/a2a/{agent_id}/message/send"
tags: ["[beta] A2A Agents"]
---

# Invoke Agent A2A

`POST /a2a/{agent_id}/message/send`

## Request

- Base URL: `https://api.vibebrowser.app` (the document declares no server; this is the origin it was published from)
- URL: `https://api.vibebrowser.app/a2a/{agent_id}/message/send`
- Auth: one of:
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`

Invoke an agent using the A2A protocol (JSON-RPC 2.0).

Supported methods:
- message/send: Send a message and get a response
- message/stream: Send a message and stream the response

## Path parameters

- `agent_id` string, required

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/vibebrowser/apis/litellm-api.md) · [All operations](https://skmtc.dev/vibebrowser/apis/litellm-api/llms.txt) · [OpenAPI document](https://skmtc.dev/vibebrowser/apis/litellm-api/revisions/23d8a3c192b6?raw)