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OpenAPI Specification

openapi: 3.2.0
info:
  title: Anthropic Sessions API
  version: '1.0'
  description: 'Operations tagged Sessions across 2 of this provider''s published API definitions: anthropic-api-openapi.json, anthropic-managed-agents-api-openapi.yml. Each path carries the servers of the definition it was published in.'
servers:
- url: https://api.anthropic.com
tags:
- name: Sessions
paths:
  /v1/sessions/{session_id}/archive?beta=true:
    post:
      operationId: BetaArchiveSession
      summary: Archive Session
      parameters:
      - name: anthropic-version
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-beta
        in: header
        required: false
        schema:
          type: string
          items:
            type: string
          x-stainless-override-schema:
            x-stainless-param: betas
            x-stainless-extend-default: true
            type: array
            description: Optional header to specify the beta version(s) you want to use.
            items:
              $ref: '#/components/schemas/AnthropicBeta'
      - name: session_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter session_id
        example: sesn_011CZkZAtmR3yMPDzynEDxu7
      responses:
        '200':
          description: Successful response (OK)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaManagedAgentsSession'
        '400':
          description: Invalid argument - The client specified an invalid argument
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '401':
          description: Unauthenticated - The request does not have valid authentication credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '403':
          description: Permission denied - The caller does not have permission to execute the specified operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '404':
          description: Not found - Some requested entity was not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '408':
          description: Deadline exceeded - The deadline expired before the operation could complete
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '409':
          description: Aborted - The operation was aborted due to concurrency issue
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '412':
          description: Failed precondition - Operation was rejected because the system is not in required state
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '413':
          description: Out of range - Operation was attempted past the valid range
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '429':
          description: Resource exhausted - Some resource has been exhausted (rate limiting)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '431':
          description: Request header fields too large - Request metadata was too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '499':
          description: Cancelled - The operation was cancelled by the client
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '500':
          description: Internal - Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '501':
          description: Unimplemented - The operation is not implemented or supported
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '503':
          description: Unavailable - The service is currently unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '504':
          description: Deadline exceeded - Upstream service did not respond in time
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
      x-anthropic-beta-required:
      - managed-agents-2026-04-01
      tags:
      - Sessions
    servers:
    - url: https://api.anthropic.com
  /v1/sessions/{session_id}/events/stream?beta=true:
    get:
      operationId: BetaStreamSessionEvents
      summary: Stream Events
      parameters:
      - name: x-api-key
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-version
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-beta
        in: header
        required: false
        schema:
          type: string
          items:
            type: string
          x-stainless-override-schema:
            x-stainless-param: betas
            x-stainless-extend-default: true
            type: array
            description: Optional header to specify the beta version(s) you want to use.
            items:
              $ref: '#/components/schemas/AnthropicBeta'
      - name: session_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter session_id
        example: sesn_011CZkZAtmR3yMPDzynEDxu7
      - name: event_deltas[]
        in: query
        required: false
        style: form
        explode: true
        schema:
          type: array
          items:
            $ref: '#/components/schemas/BetaManagedAgentsEventDeltaType'
        description: 'When set, this connection also receives streaming deltas (`event_start`, `event_delta`) while an event is being produced, before the event itself arrives. Deltas are best-effort; when the final event is produced it carries the complete content. A model request that ends early (an error or interrupt) produces no final event — its terminal `span.model_request_end` closes the preview. Accepts one or more event types to preview and may be repeated: `agent.message` streams `content_delta` fragments; `agent.thinking` is start-only — a signal that the agent has begun extended thinking, concluded by the `agent.thinking` event itself. Only previews of the requested event types are sent.'
      responses:
        '200':
          description: Successful response (OK)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaManagedAgentsStreamSessionEvents'
        '400':
          description: Invalid argument - The client specified an invalid argument
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '401':
          description: Unauthenticated - The request does not have valid authentication credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '403':
          description: Permission denied - The caller does not have permission to execute the specified operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '404':
          description: Not found - Some requested entity was not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '408':
          description: Deadline exceeded - The deadline expired before the operation could complete
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '409':
          description: Aborted - The operation was aborted due to concurrency issue
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '412':
          description: Failed precondition - Operation was rejected because the system is not in required state
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '413':
          description: Out of range - Operation was attempted past the valid range
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '429':
          description: Resource exhausted - Some resource has been exhausted (rate limiting)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '431':
          description: Request header fields too large - Request metadata was too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '499':
          description: Cancelled - The operation was cancelled by the client
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '500':
          description: Internal - Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '501':
          description: Unimplemented - The operation is not implemented or supported
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '503':
          description: Unavailable - The service is currently unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '504':
          description: Deadline exceeded - Upstream service did not respond in time
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
      x-anthropic-beta-required:
      - managed-agents-2026-04-01
      tags:
      - Sessions
    servers:
    - url: https://api.anthropic.com
  /v1/sessions/{session_id}/events?beta=true:
    get:
      operationId: BetaListEvents
      summary: List Events
      parameters:
      - name: x-api-key
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-version
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-beta
        in: header
        required: false
        schema:
          type: string
          items:
            type: string
          x-stainless-override-schema:
            x-stainless-param: betas
            x-stainless-extend-default: true
            type: array
            description: Optional header to specify the beta version(s) you want to use.
            items:
              $ref: '#/components/schemas/AnthropicBeta'
      - name: session_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter session_id
        example: sesn_011CZkZAtmR3yMPDzynEDxu7
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          format: int32
        description: Query parameter for limit
      - name: page
        in: query
        required: false
        schema:
          type: string
        description: Opaque pagination cursor from a previous response's next_page.
      - name: order
        in: query
        required: false
        schema:
          $ref: '#/components/schemas/BetaManagedAgentsListOrder'
        description: Sort direction for results, ordered by the event's `processed_at`. Defaults to asc (chronological).
      - name: types[]
        in: query
        required: false
        style: form
        explode: true
        schema:
          type: array
          items:
            type: string
        description: Filter by event type. Values match the `type` field on returned events (for example, `user.message` or `agent.tool_use`). Omit to return all event types.
      - name: created_at[gte]
        in: query
        required: false
        schema:
          $ref: '#/components/schemas/BetaTimestamp'
        description: Return events created at or after this time (inclusive). Compared against the event's `processed_at` value.
      - name: created_at[gt]
        in: query
        required: false
        schema:
          $ref: '#/components/schemas/BetaTimestamp'
        description: Return events created after this time (exclusive). Compared against the event's `processed_at` value.
      - name: created_at[lte]
        in: query
        required: false
        schema:
          $ref: '#/components/schemas/BetaTimestamp'
        description: Return events created at or before this time (inclusive). Compared against the event's `processed_at` value.
      - name: created_at[lt]
        in: query
        required: false
        schema:
          $ref: '#/components/schemas/BetaTimestamp'
        description: Return events created before this time (exclusive). Compared against the event's `processed_at` value.
      responses:
        '200':
          description: Successful response (OK)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaManagedAgentsListSessionEvents'
        '400':
          description: Invalid argument - The client specified an invalid argument
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '401':
          description: Unauthenticated - The request does not have valid authentication credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '403':
          description: Permission denied - The caller does not have permission to execute the specified operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '404':
          description: Not found - Some requested entity was not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '408':
          description: Deadline exceeded - The deadline expired before the operation could complete
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '409':
          description: Aborted - The operation was aborted due to concurrency issue
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '412':
          description: Failed precondition - Operation was rejected because the system is not in required state
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '413':
          description: Out of range - Operation was attempted past the valid range
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '429':
          description: Resource exhausted - Some resource has been exhausted (rate limiting)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '431':
          description: Request header fields too large - Request metadata was too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '499':
          description: Cancelled - The operation was cancelled by the client
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '500':
          description: Internal - Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '501':
          description: Unimplemented - The operation is not implemented or supported
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '503':
          description: Unavailable - The service is currently unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '504':
          description: Deadline exceeded - Upstream service did not respond in time
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
      x-anthropic-beta-required:
      - managed-agents-2026-04-01
      tags:
      - Sessions
    post:
      operationId: BetaSendEvents
      summary: Send Events
      parameters:
      - name: anthropic-version
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-beta
        in: header
        required: false
        schema:
          type: string
          items:
            type: string
          x-stainless-override-schema:
            x-stainless-param: betas
            x-stainless-extend-default: true
            type: array
            description: Optional header to specify the beta version(s) you want to use.
            items:
              $ref: '#/components/schemas/AnthropicBeta'
      - name: session_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter session_id
        example: sesn_011CZkZAtmR3yMPDzynEDxu7
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BetaManagedAgentsSendSessionEventsParams'
      responses:
        '200':
          description: Successful response (OK)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaManagedAgentsSendSessionEvents'
        '400':
          description: Invalid argument - The client specified an invalid argument
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '401':
          description: Unauthenticated - The request does not have valid authentication credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '403':
          description: Permission denied - The caller does not have permission to execute the specified operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '404':
          description: Not found - Some requested entity was not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '408':
          description: Deadline exceeded - The deadline expired before the operation could complete
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '409':
          description: Aborted - The operation was aborted due to concurrency issue
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '412':
          description: Failed precondition - Operation was rejected because the system is not in required state
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '413':
          description: Out of range - Operation was attempted past the valid range
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '429':
          description: Resource exhausted - Some resource has been exhausted (rate limiting)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '431':
          description: Request header fields too large - Request metadata was too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '499':
          description: Cancelled - The operation was cancelled by the client
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '500':
          description: Internal - Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '501':
          description: Unimplemented - The operation is not implemented or supported
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '503':
          description: Unavailable - The service is currently unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '504':
          description: Deadline exceeded - Upstream service did not respond in time
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
      x-anthropic-beta-required:
      - managed-agents-2026-04-01
      tags:
      - Sessions
    servers:
    - url: https://api.anthropic.com
  /v1/sessions/{session_id}/resources/{resource_id}?beta=true:
    get:
      operationId: BetaGetResource
      summary: Get Session Resource
      parameters:
      - name: x-api-key
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-version
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-beta
        in: header
        required: false
        schema:
          type: string
          items:
            type: string
          x-stainless-override-schema:
            x-stainless-param: betas
            x-stainless-extend-default: true
            type: array
            description: Optional header to specify the beta version(s) you want to use.
            items:
              $ref: '#/components/schemas/AnthropicBeta'
      - name: session_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter session_id
        example: sesn_011CZkZAtmR3yMPDzynEDxu7
      - name: resource_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter resource_id
        example: sesrsc_011CZkZBJq5dWxk9fVLNcPht
      responses:
        '200':
          description: Successful response (OK)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaManagedAgentsGetSessionResource'
        '400':
          description: Invalid argument - The client specified an invalid argument
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '401':
          description: Unauthenticated - The request does not have valid authentication credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '403':
          description: Permission denied - The caller does not have permission to execute the specified operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '404':
          description: Not found - Some requested entity was not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '408':
          description: Deadline exceeded - The deadline expired before the operation could complete
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '409':
          description: Aborted - The operation was aborted due to concurrency issue
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '412':
          description: Failed precondition - Operation was rejected because the system is not in required state
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '413':
          description: Out of range - Operation was attempted past the valid range
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '429':
          description: Resource exhausted - Some resource has been exhausted (rate limiting)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '431':
          description: Request header fields too large - Request metadata was too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '499':
          description: Cancelled - The operation was cancelled by the client
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '500':
          description: Internal - Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '501':
          description: Unimplemented - The operation is not implemented or supported
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '503':
          description: Unavailable - The service is currently unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '504':
          description: Deadline exceeded - Upstream service did not respond in time
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
      x-anthropic-beta-required:
      - managed-agents-2026-04-01
      tags:
      - Sessions
    delete:
      operationId: BetaDeleteResource
      summary: Delete Session Resource
      parameters:
      - name: x-api-key
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-version
        in: header
        required: false
        schema:
          type: string
      - name: anthropic-beta
        in: header
        required: false
        schema:
          type: string
          items:
            type: string
          x-stainless-override-schema:
            x-stainless-param: betas
            x-stainless-extend-default: true
            type: array
            description: Optional header to specify the beta version(s) you want to use.
            items:
              $ref: '#/components/schemas/AnthropicBeta'
      - name: session_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter session_id
        example: sesn_011CZkZAtmR3yMPDzynEDxu7
      - name: resource_id
        in: path
        required: true
        schema:
          type: string
        description: Path parameter resource_id
        example: sesrsc_011CZkZBJq5dWxk9fVLNcPht
      responses:
        '200':
          description: Successful response (OK)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaManagedAgentsDeleteSessionResource'
        '400':
          description: Invalid argument - The client specified an invalid argument
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '401':
          description: Unauthenticated - The request does not have valid authentication credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '403':
          description: Permission denied - The caller does not have permission to execute the specified operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '404':
          description: Not found - Some requested entity was not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '408':
          description: Deadline exceeded - The deadline expired before the operation could complete
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '409':
          description: Aborted - The operation was aborted due to concurrency issue
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '412':
          description: Failed precondition - Operation was rejected because the system is not in required state
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '413':
          description: Out of range - Operation was attempted past the valid range
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '429':
          description: Resource exhausted - Some resource has been exhausted (rate limiting)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '431':
          description: Request header fields too large - Request metadata was too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '499':
          description: Cancelled - The operation was cancelled by the client
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '500':
          description: Internal - Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '501':
          description: Unimplemented - The operation is not implemented or supported
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BetaErrorResponse'
        '503':
          description: Unavailable - The service is currently unavailable
          content:
            application/js

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