openapi: 3.1.0
info:
  title: Linear Attachments GraphQL 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: GraphQL
  description: Core GraphQL query and mutation endpoint
paths:
  /graphql:
    post:
      operationId: executeGraphQLQuery
      summary: Execute a GraphQL query or mutation
      description: Send a GraphQL query or mutation to the Linear API. All operations (issues, projects, teams, cycles, roadmaps, comments, attachments) are performed through this single endpoint using GraphQL introspection.
      tags:
      - GraphQL
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GraphQLRequest'
            examples:
              listIssues:
                summary: List issues
                value:
                  query: "query {\n  issues(first: 10) {\n    nodes {\n      id\n      title\n      state { name }\n      assignee { name }\n      priority\n      createdAt\n    }\n    pageInfo { hasNextPage endCursor }\n  }\n}\n"
              createIssue:
                summary: Create an issue
                value:
                  query: "mutation CreateIssue($input: IssueCreateInput!) {\n  issueCreate(input: $input) {\n    success\n    issue { id title url }\n  }\n}\n"
                  variables:
                    input:
                      title: Fix login bug
                      description: Users cannot log in with SSO
                      teamId: team_abc123
                      priority: 2
      responses:
        '200':
          description: GraphQL response (errors may still be present in the response body)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GraphQLResponse'
        '400':
          description: Bad request — malformed GraphQL syntax
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized — missing or invalid authentication
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded
          headers:
            X-RateLimit-Limit:
              schema:
                type: integer
              description: Maximum requests per window
            X-RateLimit-Remaining:
              schema:
                type: integer
              description: Requests remaining in the current window
            X-RateLimit-Reset:
              schema:
                type: integer
              description: Unix timestamp when rate limit resets
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    GraphQLRequest:
      type: object
      required:
      - query
      properties:
        query:
          type: string
          description: The GraphQL query or mutation string
        variables:
          type: object
          additionalProperties: true
          description: Named variables for the query or mutation
        operationName:
          type: string
          description: The name of the operation to execute (for multi-operation documents)
    GraphQLResponse:
      type: object
      properties:
        data:
          type: object
          additionalProperties: true
          description: The data returned by the GraphQL operation
        errors:
          type: array
          items:
            $ref: '#/components/schemas/GraphQLError'
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Machine-readable error code
        message:
          type: string
          description: Human-readable error message
    GraphQLError:
      type: object
      properties:
        message:
          type: string
          description: Human-readable error message
        locations:
          type: array
          items:
            type: object
            properties:
              line:
                type: integer
              column:
                type: integer
        path:
          type: array
          items:
            type: string
        extensions:
          type: object
          additionalProperties: true
  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