openapi: 3.2.0
info:
  title: Taskfolk Activity API
  version: 1.0.0
  description: Public REST API for Taskfolk (taskfolk.ai). All endpoints require a workspace-scoped bearer API key. Paths are nested under `/v1/workspaces/{slug}/…`.
servers:
- url: https://taskfolk.ai/api
security:
- bearerAuth: []
tags:
- name: Activity
paths:
  /v1/workspaces/{slug}/projects/{key}/issues/{issueKey}/activity:
    get:
      summary: List issue activity.
      tags:
      - Activity
      security:
      - bearerAuth:
        - issues:read
      parameters:
      - schema:
          type: string
          example: taskfolk
          description: Workspace slug.
        required: true
        description: Workspace slug.
        name: slug
        in: path
      - schema:
          type: string
          example: web
          description: Project key.
        required: true
        description: Project key.
        name: key
        in: path
      - schema:
          type: string
          example: WEB-39
          description: Issue key (KEY-N).
        required: true
        description: Issue key (KEY-N).
        name: issueKey
        in: path
      - schema:
          type: string
        required: false
        name: cursor
        in: query
      - schema:
          type:
          - integer
          - 'null'
        required: false
        name: limit
        in: query
      responses:
        '200':
          description: Success.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Activity'
                  pagination:
                    $ref: '#/components/schemas/Pagination'
                required:
                - data
                - pagination
        '400':
          description: Validation error.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
        '401':
          description: Missing / invalid API key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
        '403':
          description: Key lacks the required scope.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
        '404':
          description: Resource not found (or cross-workspace — never leaked).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
        '429':
          description: Rate limited.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
components:
  schemas:
    Pagination:
      type: object
      properties:
        next_cursor:
          type:
          - string
          - 'null'
          example: null
      required:
      - next_cursor
    Activity:
      type: object
      properties:
        id:
          type: string
        kind:
          type: string
          example: status_changed
        actor_id:
          type:
          - string
          - 'null'
        payload:
          type: object
          additionalProperties: {}
        created_at:
          type: string
          format: date-time
          example: '2026-05-28T14:30:00Z'
      required:
      - id
      - kind
      - actor_id
      - payload
      - created_at
    ErrorEnvelope:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              enum:
              - unauthorized
              - forbidden
              - not_found
              - validation
              - rate_limited
              - conflict
              - idempotency_violation
              - internal_error
              example: validation
            message:
              type: string
              example: Label "foo" does not exist on this project.
            details:
              type: object
              additionalProperties: {}
          required:
          - code
          - message
      required:
      - error
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API key
      description: 'Workspace API key. Send as `Authorization: Bearer tfk_live_…`. Each key is bound to exactly one workspace and carries a set of scopes.'