linear Attachments API

openapi: 3.1.0
info:
  title: Linear GraphQL Attachments API
  description: Linear's public GraphQL API provides full access to create, read, update, and query issues, projects, cycles, roadmaps, and teams. It is the same API Linear uses internally for its own applications, supporting pagination, filtering, attachments, and file uploads.
  version: 2.0.0
  contact:
    name: Linear Support
    url: https://linear.app/contact/support
  license:
    name: Proprietary
    url: https://linear.app/terms
servers:
- url: https://api.linear.app/graphql
  description: Linear GraphQL endpoint
security:
- BearerAuth: []
- OAuth2:
  - read
  - write
tags:
- name: Attachments
  description: File upload for issue and comment attachments
paths:
  /graphql/upload:
    post:
      operationId: uploadFile
      summary: Upload a file attachment
      description: Upload files for use as attachments on issues or comments. Returns a signed URL and asset URL for use in subsequent GraphQL mutations.
      tags:
      - Attachments
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file:
                  type: string
                  format: binary
                  description: The file to upload
                contentType:
                  type: string
                  description: MIME type of the file
      responses:
        '200':
          description: File uploaded successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FileUploadResponse'
        '413':
          description: File too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Machine-readable error code
        message:
          type: string
          description: Human-readable error message
    FileUploadResponse:
      type: object
      properties:
        uploadUrl:
          type: string
          format: uri
          description: Signed URL to PUT the file to
        assetUrl:
          type: string
          format: uri
          description: URL to reference the asset in Linear
        headers:
          type: object
          additionalProperties:
            type: string
          description: Headers required when uploading to the signed URL
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: Personal API key obtained from Linear settings
    OAuth2:
      type: oauth2
      description: OAuth 2.0 authorization code flow
      flows:
        authorizationCode:
          authorizationUrl: https://linear.app/oauth/authorize
          tokenUrl: https://api.linear.app/oauth/token
          scopes:
            read: Read access to all resources
            write: Write access to all resources
            issues:create: Create issues
            issues:read: Read issues
externalDocs:
  description: Linear Developer Documentation
  url: https://linear.app/developers/graphql