> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gobare.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Fork a session

> Branch a session, workspace and transcript included.



## OpenAPI

````yaml /openapi.json post /v1/sessions/{session_id}/fork
openapi: 3.1.0
info:
  title: Gobare Agent API
  version: v1
  description: >-
    Programmatic access to Gobare coding-agent sessions. Conceptually aligned
    with OpenAI's Agents API; deliberately not wire-compatible with it. See the
    divergence list in the product documentation.
servers:
  - url: https://api.{domain}
    variables:
      domain:
        default: gobare.dev
security: []
paths:
  /v1/sessions/{session_id}/fork:
    post:
      summary: Fork a session
      description: Branch a session, workspace and transcript included.
      operationId: post_sessions_session_id_fork
      parameters:
        - name: Idempotency-Key
          in: header
          required: false
          schema:
            type: string
            maxLength: 255
          description: >-
            Retrying with the same key replays the first answer instead of
            acting again.
      responses:
        '201':
          description: Branch a session, workspace and transcript included.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Fork'
        '400':
          description: >-
            `invalid_request`. A query parameter this endpoint does not take.
            Refused rather than ignored, because an ignored filter answers with
            everything and looks like a filter that matched.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: The access token is missing, unrecognised, expired or revoked.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: >-
            The token is valid but may not perform this call. The message names
            the scope it wanted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: >-
            No such endpoint, or no such object under this token's organization.
            Another organization's id is indistinguishable from one that never
            existed, deliberately.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '409':
          description: >-
            The session's state does not allow this call, or an identical
            request is already in flight under the same Idempotency-Key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: >-
            `rate_limit_exceeded` — the token is past its allowance for this
            bucket; honour `Retry-After`. Or `queue_full` — too many messages
            are already waiting behind the current turn. Branch on `code`.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: An unexpected error. Quote the request id.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      security:
        - accessToken: []
components:
  schemas:
    Fork:
      type: object
      description: >-
        A new session branched from another, with its workspace and transcript.
        It spends a session slot like any other, and is refused by the same
        ceiling with the same code.
      properties:
        forked_from:
          type: string
          description: The session this was branched from. It is untouched.
        workspace_copied:
          type: boolean
          description: >-
            Whether the workspace came with it. False means the fork starts
            empty — a fork is still useful without it, and believing the files
            are there when they are not is worse than knowing.
    Error:
      type: object
      required:
        - error
      description: Every refusal this API makes, in one shape.
      properties:
        error:
          description: Always present on a failure, and the only thing present.
          type: object
          required:
            - code
            - message
            - request_id
          properties:
            code:
              type: string
              enum:
                - invalid_request
                - authentication_error
                - permission_denied
                - not_found
                - method_not_allowed
                - conflict
                - queue_full
                - rate_limit_exceeded
                - project_limit_exceeded
                - context_length_exceeded
                - provider_error
                - provider_unauthorized
                - sandbox_error
                - sandbox_unavailable
                - directory_unavailable
                - workspace_recovery_failed
                - bridge_incompatible
                - internal_error
            message:
              type: string
            request_id:
              type: string
              description: >-
                Also on the x-request-id header. Quote it when reporting a
                problem.
  securitySchemes:
    accessToken:
      type: http
      scheme: bearer
      description: >-
        A `gbr_pat_` access token. Scopes are recorded on the token when it is
        minted.

````