---
title: "Get supported A2A protocol versions"
method: GET
path: "/v1/a2a/versions"
tags: ["A2A Protocol"]
---

# Get supported A2A protocol versions

`GET /v1/a2a/versions`

Returns the list of supported A2A protocol versions for a specific role (client or server).

    - **role**: Specify 'client' or 'server' to get versions for that role
    - Returns version information including feature support matrix
    - Client role is currently implemented
    - Server role is not yet implemented

## Query parameters

- `role` 'client' | 'server' — Role type: 'client' for A2A client versions, 'server' for A2A server versions

## Response `200`

Successfully retrieved A2A supported versions

- A2ASupportedVersionsResponse — Response model for A2A supported versions endpoint.
  - `protocol` string — Protocol name
  - `role` 'client' | 'server', required — Role type (client or server)
  - `versions` A2AVersionInfo[], required — List of supported versions with their features
    - `version` string, required — Version string (e.g., '0.3.0')
    - `status` 'current' | 'supported' | 'deprecated' | 'unsupported', required — Version status indicator
    - `features` VersionFeatures, required — Feature flags supported by a specific A2A version.
      - `push_notifications` boolean, required — Support for push notifications from agent to server
      - `streaming` boolean, required — Support for streaming responses
      - `send_history` boolean, required — Support for sending conversation history
  - `current_version` string, nullable, required — Current/recommended version for this role
  - `is_implemented` boolean, required — Whether this role is currently implemented

## Other responses

- `400` — Invalid role parameter
- `422` — Validation Error
- `501` — A2A server role not yet implemented

---

[API](https://skmtc.net/ibm/apis/wxo-server-api.md) · [All operations](https://skmtc.net/ibm/apis/wxo-server-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/ibm/wxo-server-api/revisions/82c114c37196/schema)