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

# Retrieve a session

> Returns a single session by ID, including the task runs executed within it.



## OpenAPI

````yaml /api-reference/v2.json get /sessions/{session_id}
openapi: 3.1.1
info:
  title: Deck API
  version: 2.0.0
servers:
  - url: https://api.deck.co/v2
    description: Production
security:
  - BearerAuth: []
tags:
  - name: Agents
  - name: Components
  - name: Credentials
  - name: Event Destinations
  - name: Events
  - name: Sessions
  - name: Sources
  - name: Storage
  - name: Task Runs
  - name: Tasks
  - name: Test
paths:
  /sessions/{session_id}:
    get:
      tags:
        - Sessions
      summary: Retrieve a session
      description: >-
        Returns a single session by ID, including the task runs executed within
        it.
      operationId: getSession
      parameters:
        - name: session_id
          in: path
          required: true
          schema:
            type: string
          description: Unique identifier for the session (prefixed with `sess_`).
      responses:
        '200':
          description: OK
          content:
            text/plain:
              schema:
                $ref: '#/components/schemas/GetSessionResponse'
            application/json:
              schema:
                $ref: '#/components/schemas/GetSessionResponse'
            text/json:
              schema:
                $ref: '#/components/schemas/GetSessionResponse'
        '400':
          description: Bad request — validation error or malformed input.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationErrorResponse'
        '401':
          description: Unauthorized.
        '403':
          description: Forbidden.
        '404':
          description: Not found — the requested resource does not exist.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: >-
            Conflict — the request is valid but cannot be completed in the
            current state.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: >-
            Unprocessable content — the request body is understood but contains
            invalid values.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    GetSessionResponse:
      required:
        - id
        - object
        - status
        - runtime_ms
        - task_runs
        - created_at
        - updated_at
        - request_id
      type: object
      properties:
        id:
          type: string
          description: Unique identifier for the session, prefixed with `sess_`.
        object:
          type: string
          description: Always `session`.
        status:
          type: string
          description: >-
            Session status: `queued`, `running`, `idle`, `completing`,
            `completed`, or `failed`.
        runtime_ms:
          pattern: ^-?(?:0|[1-9]\d*)$
          type:
            - 'null'
            - integer
            - string
          format: int32
          description: Total session runtime in milliseconds.
        task_runs:
          type: array
          items:
            $ref: '#/components/schemas/SessionTaskRunData'
          description: Task runs executed within this session.
        created_at:
          type: string
          format: date-time
          description: ISO 8601 timestamp of when the resource was created.
        updated_at:
          type: string
          format: date-time
          description: ISO 8601 timestamp of when the resource was last updated.
        request_id:
          type: string
          description: >-
            Unique identifier for the API request. Include this when contacting
            support.
      description: >-
        A session object representing an isolated compute session for executing
        tasks.
    ValidationErrorResponse:
      required:
        - errors
      type: object
      properties:
        type:
          type:
            - 'null'
            - string
          description: RFC 9110 problem type URI.
        title:
          type:
            - 'null'
            - string
          description: Short summary of the validation failure.
        status:
          type:
            - 'null'
            - integer
          description: HTTP status code.
          format: int32
        errors:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: Validation errors grouped by field name.
        traceId:
          type:
            - 'null'
            - string
          description: Request trace identifier.
      description: Validation error returned for malformed requests (HTTP 400).
    ErrorResponse:
      required:
        - errors
        - request_id
      type: object
      properties:
        errors:
          type: array
          items:
            $ref: '#/components/schemas/TaskRunError'
          description: One or more errors that describe what went wrong.
        request_id:
          type: string
          description: Unique identifier for this request, useful for tracing.
      description: Standard error response.
    SessionTaskRunData:
      required:
        - id
        - task_id
        - agent_id
        - credential_id
      type: object
      properties:
        id:
          type: string
          description: Unique identifier for the task run.
        task_id:
          type: string
          description: ID of the task that was executed.
        agent_id:
          type: string
          description: ID of the agent that executed the run.
        credential_id:
          type:
            - 'null'
            - string
          description: ID of the credential used for authentication, if any.
      description: Lightweight summary of a task run within a session.
    TaskRunError:
      required:
        - type
        - code
        - message
      type: object
      properties:
        type:
          type: string
          description: >-
            Error category (e.g. `source`, `auth`, `task`, `rate_limit`).
            Determines the class of failure.
        code:
          type: string
          description: Machine-readable error code. Use this for programmatic handling.
        message:
          type: string
          description: >-
            Human-readable explanation. Do not rely on this for logic — it may
            change.
        field:
          type:
            - 'null'
            - string
          description: The input field that caused the error, when applicable.
      description: Error details for a failed task run. Same structure as API-level errors.
  securitySchemes:
    BearerAuth:
      type: http
      description: Secret key (sk_live_...)
      scheme: bearer
      bearerFormat: JWT

````