Anthropic Events API

openapi: 3.1.0
info:
  title: Anthropic Admin Agents Events API
  description: Manage administrative functions for Anthropic organizations, workspaces, users, invites, and API keys.
  version: 1.0.0
  contact:
    name: Anthropic
    url: https://www.anthropic.com
    email: support@anthropic.com
  license:
    name: Anthropic API License
    url: https://www.anthropic.com/terms
servers:
- url: https://api.anthropic.com/v1
  description: Production Server
security:
- AdminApiKeyAuth: []
tags:
- name: Events
  description: User messages and tool results sent to a session
paths:
  /v1/sessions/{session_id}/events:
    post:
      summary: Anthropic Send Session Events
      description: 'Send user events to drive session execution. Event types include user.message, tool.result, and interrupt.

        '
      operationId: sendSessionEvents
      tags:
      - Events
      parameters:
      - $ref: '#/components/parameters/AnthropicVersion'
      - $ref: '#/components/parameters/AnthropicBeta'
      - $ref: '#/components/parameters/SessionIdPath'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EventBatch'
      responses:
        '200':
          description: Events accepted.
  /v1/sessions/{session_id}/stream:
    get:
      summary: Anthropic Stream Session Events
      description: 'Server-sent events stream of agent execution: assistant messages, tool calls, tool results, and status changes.

        '
      operationId: streamSession
      tags:
      - Events
      parameters:
      - $ref: '#/components/parameters/AnthropicVersion'
      - $ref: '#/components/parameters/AnthropicBeta'
      - $ref: '#/components/parameters/SessionIdPath'
      responses:
        '200':
          description: SSE stream of session events.
          content:
            text/event-stream:
              schema:
                type: string
components:
  parameters:
    SessionIdPath:
      name: session_id
      in: path
      required: true
      schema:
        type: string
    AnthropicBeta:
      name: anthropic-beta
      in: header
      required: true
      description: Must include managed-agents-2026-04-01.
      schema:
        type: string
        default: managed-agents-2026-04-01
    AnthropicVersion:
      name: anthropic-version
      in: header
      required: true
      schema:
        type: string
        default: '2023-06-01'
  schemas:
    EventBatch:
      type: object
      required:
      - events
      properties:
        events:
          type: array
          items:
            type: object
            properties:
              type:
                type: string
                enum:
                - user.message
                - tool.result
                - interrupt
              content:
                type: array
                items:
                  type: object
  securitySchemes:
    AdminApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: Your Admin API key for authentication (starts with sk-ant-admin...).