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

# Download a Gmail attachment's bytes as the calling member

> Downloads one Gmail attachment (file) as base64-encoded bytes, using the messageId and the attachmentId from the gmail-message capability's attachments metadata. Decode dataBase64 locally to reconstruct the file, e.g. a PDF or spreadsheet, then extract its contents.



## OpenAPI

````yaml /openapi.json get /v1/capabilities/google-workspace/gmail-attachment/{messageId}/{attachmentId}
openapi: 3.1.0
info:
  title: Den API
  description: >-
    OpenAPI spec for the Den control plane API.


    Authentication:

    - Use `Authorization: Bearer <session-token>` for user-authenticated routes
    that require a Den session.

    - Use `x-api-key: <den-api-key>` for API-key-authenticated routes that
    accept organization API keys.

    - Public routes like health and documentation do not require authentication.


    Swagger tip: use the security schemes in the Authorize dialog to set either
    `bearerAuth` or `denApiKey` before trying protected endpoints.
  version: dev
servers: []
security: []
tags:
  - name: System
    description: Service health and operational routes.
  - name: Organizations
    description: Top-level organization creation and context routes.
  - name: Invitations
    description: Invitation preview, acceptance, creation, and cancellation routes.
  - name: API Keys
    description: Organization API key management routes.
  - name: SCIM
    description: Organization SCIM connector management routes.
  - name: SSO
    description: Organization single sign-on connector management routes.
  - name: Members
    description: Organization member management routes.
  - name: Roles
    description: Organization custom role management routes.
  - name: Teams
    description: Organization team management routes.
  - name: Templates
    description: Organization shared template routes.
  - name: LLM Providers
    description: Organization LLM provider catalog, configuration, and access routes.
  - name: Workers
    description: Worker lifecycle, billing, and runtime routes.
  - name: Worker Runtime
    description: Worker runtime inspection and upgrade routes.
  - name: Worker Activity
    description: Worker heartbeat and activity reporting routes.
  - name: Telemetry
    description: Telemetry event ingestion and adoption analytics.
  - name: Admin
    description: Administrative reporting routes.
  - name: Users
    description: Current user and membership routes.
  - name: Bootstrap
    description: Agent-first provisional workspace setup routes.
paths:
  /v1/capabilities/google-workspace/gmail-attachment/{messageId}/{attachmentId}:
    get:
      tags:
        - Capability Sources
      summary: Download a Gmail attachment's bytes as the calling member
      description: >-
        Downloads one Gmail attachment (file) as base64-encoded bytes, using the
        messageId and the attachmentId from the gmail-message capability's
        attachments metadata. Decode dataBase64 locally to reconstruct the file,
        e.g. a PDF or spreadsheet, then extract its contents.
      operationId: getV1CapabilitiesGoogleWorkspaceGmailAttachmentByMessageIdByAttachmentId
      parameters:
        - in: path
          name: messageId
          schema:
            type: string
            minLength: 1
            maxLength: 512
          required: true
          description: Gmail message id that contains the attachment.
        - in: path
          name: attachmentId
          schema:
            type: string
            minLength: 1
            maxLength: 2048
          required: true
          description: >-
            Attachment id from the gmail-message capability's attachments
            metadata.
      responses:
        '200':
          description: Gmail attachment returned.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GoogleWorkspaceGmailAttachmentResponse'
        '401':
          description: The caller must be signed in.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UnauthorizedError'
        '409':
          description: >-
            The calling member has not connected their Google account or is
            missing permission.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GoogleWorkspaceNeedsConnectionError'
        '502':
          description: Google rejected the request.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GoogleWorkspaceUpstreamError'
components:
  schemas:
    GoogleWorkspaceGmailAttachmentResponse:
      type: object
      properties:
        ok:
          type: boolean
          const: true
        messageId:
          type: string
        attachmentId:
          type: string
        size:
          type: number
          description: Attachment size in bytes.
        dataBase64:
          type: string
          description: >-
            Standard base64-encoded attachment bytes; decode locally to
            reconstruct the file.
      required:
        - ok
        - messageId
        - attachmentId
        - size
        - dataBase64
    UnauthorizedError:
      type: object
      properties:
        error:
          type: string
          const: unauthorized
      required:
        - error
    GoogleWorkspaceNeedsConnectionError:
      type: object
      properties:
        error:
          type: string
          const: needs_connection
        message:
          type: string
      required:
        - error
        - message
    GoogleWorkspaceUpstreamError:
      type: object
      properties:
        error:
          type: string
          const: google_api_error
        message:
          type: string
      required:
        - error
        - message

````