---
openapi: 3.0.3
info:
  title: ML Worker API
  description: |
    API for managing ML experiment tasks and Jupyter services.

    ## Security
    All endpoints (except health checks) require API key authentication via the
    `X-API-Key` header. Rate limiting is enforced per API key.

    ## Error Handling
    Errors follow a consistent format with machine-readable codes and trace IDs:
    ```json
    {
      "error": "Sanitized error message",
      "code": "ERROR_CODE",
      "trace_id": "uuid-for-support"
    }
    ```
  version: 1.0.0
  contact:
    name: FetchML Support
servers:
  - url: http://localhost:9101
    description: Local development server
  - url: https://api.fetchml.example.com
    description: Production server
security:
  - ApiKeyAuth: []
paths:
  /health:
    get:
      summary: Health check
      description: Returns server health status. No authentication required.
      security: []
      responses:
        '200':
          description: Server is healthy
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HealthResponse'
  /v1/tasks:
    get:
      summary: List tasks
      description: List all tasks with optional filtering
      parameters:
        - name: status
          in: query
          schema:
            type: string
            enum: [queued, running, completed, failed]
        - name: limit
          in: query
          schema:
            type: integer
            default: 50
            maximum: 1000
        - name: offset
          in: query
          schema:
            type: integer
            default: 0
        - name: user_id
          in: query
          schema:
            type: string
          description: Filter by user who submitted the task
        - name: plugin_configs
          in: query
          schema:
            type: object
            additionalProperties:
              $ref: '#/components/schemas/PluginConfig'
          description: Plugin configurations for this task
        - name: node_count
          in: query
          schema:
            type: integer
            minimum: 1
            default: 1
          description: Number of nodes for multi-node jobs
        - name: reservation_id
          in: query
          schema:
            type: string
          description: Pre-reserved capacity for this task
      responses:
        '200':
          description: List of tasks
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskList'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
    post:
      summary: Create task
      description: Submit a new ML experiment task
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateTaskRequest'
      responses:
        '201':
          description: Task created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Task'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
        '429':
          $ref: '#/components/responses/RateLimited'
  /v1/tasks/{taskId}:
    get:
      summary: Get task details
      parameters:
        - name: taskId
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Task details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Task'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      summary: Cancel/delete task
      parameters:
        - name: taskId
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Task cancelled
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/queue:
    get:
      summary: Queue status
      description: Get current queue statistics
      responses:
        '200':
          description: Queue statistics
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QueueStats'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/plugins:
    get:
      summary: List available plugins
      description: Returns all registered plugins and their status
      tags:
        - Plugins
      responses:
        '200':
          description: List of plugins
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Plugin'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
  /v1/plugins/{pluginName}:
    get:
      summary: Get plugin details
      description: Returns plugin configuration and status
      tags:
        - Plugins
      parameters:
        - name: pluginName
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Plugin details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Plugin'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/plugins/{pluginName}/config:
    get:
      summary: Get plugin configuration
      description: Returns plugin configuration
      tags:
        - Plugins
      parameters:
        - name: pluginName
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Plugin configuration
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PluginConfig'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
    put:
      summary: Update plugin configuration
      description: Update plugin configuration (hot-reload if supported)
      tags:
        - Plugins
      parameters:
        - name: pluginName
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PluginConfig'
      responses:
        '200':
          description: Configuration updated
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Plugin'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '422':
          $ref: '#/components/responses/ValidationError'
    delete:
      summary: Disable/unload plugin
      description: Disable plugin (may require restart if plugin requires it)
      tags:
        - Plugins
      parameters:
        - name: pluginName
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Plugin disabled
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/plugins/{pluginName}/health:
    get:
      summary: Check plugin health
      description: Returns health status of plugin sidecars
      tags:
        - Plugins
      parameters:
        - name: pluginName
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Plugin health
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HealthResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/scheduler/status:
    get:
      summary: Get scheduler status
      description: Returns queue depths, worker counts, and metrics
      tags:
        - Scheduler
      responses:
        '200':
          description: Scheduler status
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SchedulerStatus'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
  /v1/scheduler/status/stream:
    get:
      summary: SSE stream of scheduler state changes
      description: Emits events on queue depth changes, worker connect/disconnect, job transitions
      tags:
        - Scheduler
      produces:
        - text/event-stream
      responses:
        '200':
          description: SSE stream
          content:
            text/event-stream:
              schema:
                type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
  /v1/scheduler/workers:
    get:
      summary: List connected workers
      description: Returns all workers and their capabilities
      tags:
        - Scheduler
      responses:
        '200':
          description: List of workers
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Worker'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
  /v1/scheduler/workers/{workerId}:
    get:
      summary: Get worker details
      description: Returns detailed worker information
      tags:
        - Scheduler
      parameters:
        - name: workerId
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Worker details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Worker'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      summary: Disconnect/drain worker
      description: Gracefully drain and disconnect a worker
      tags:
        - Scheduler
      parameters:
        - name: workerId
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Worker draining initiated
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/scheduler/reservations:
    get:
      summary: List active reservations
      description: Returns all active capacity reservations
      tags:
        - Scheduler
      responses:
        '200':
          description: List of reservations
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Reservation'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
    post:
      summary: Create reservation
      description: Reserve capacity for large jobs
      tags:
        - Scheduler
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateReservationRequest'
      responses:
        '201':
          description: Reservation created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Reservation'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '422':
          $ref: '#/components/responses/ValidationError'
  /v1/scheduler/jobs/{jobId}/priority:
    patch:
      summary: Update job priority
      description: Change the priority of a queued or running job
      tags:
        - Scheduler
      parameters:
        - name: jobId
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - priority
              properties:
                priority:
                  type: integer
                  minimum: 1
                  maximum: 10
      responses:
        '200':
          description: Priority updated
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Task'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/scheduler/jobs/{jobId}/stream:
    get:
      summary: SSE stream of job progress
      description: Emits events on job state transitions and priority changes
      tags:
        - Scheduler
      produces:
        - text/event-stream
      parameters:
        - name: jobId
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: SSE stream
          content:
            text/event-stream:
              schema:
                type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/audit/events:
    get:
      summary: Query audit events
      description: Filter by time range, event type, user
      tags:
        - Audit
      parameters:
        - name: from
          in: query
          schema:
            type: string
            format: date-time
          description: Start timestamp
        - name: to
          in: query
          schema:
            type: string
            format: date-time
          description: End timestamp
        - name: event_type
          in: query
          schema:
            type: string
            enum: [job_queued, job_started, job_completed, file_access, auth_attempt, plugin_configured, scheduler_drain, audit_verified]
          description: Filter by event type
        - name: user_id
          in: query
          schema:
            type: string
          description: Filter by user
        - name: limit
          in: query
          schema:
            type: integer
            default: 100
            maximum: 1000
        - name: offset
          in: query
          schema:
            type: integer
            default: 0
      responses:
        '200':
          description: List of audit events
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AuditEventList'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/RateLimited'
  /v1/audit/verify:
    post:
      summary: Verify audit chain integrity
      description: Validates the hash chain for tampering
      tags:
        - Audit
      responses:
        '200':
          description: Verification result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VerificationResult'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
  /v1/audit/chain-root:
    get:
      summary: Get current chain root hash
      description: Returns the latest event hash for external verification
      tags:
        - Audit
      responses:
        '200':
          description: Chain root hash
          content:
            application/json:
              schema:
                type: object
                properties:
                  root_hash:
                    type: string
                  timestamp:
                    type: string
                    format: date-time
                  total_events:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
  /v1/experiments:
    get:
      summary: List experiments
      description: List all experiments
      responses:
        '200':
          description: List of experiments
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Experiment'
    post:
      summary: Create experiment
      description: Create a new experiment
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateExperimentRequest'
      responses:
        '201':
          description: Experiment created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Experiment'
  /v1/jupyter/services:
    get:
      summary: List Jupyter services
      responses:
        '200':
          description: List of Jupyter services
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/JupyterService'
    post:
      summary: Start Jupyter service
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/StartJupyterRequest'
      responses:
        '201':
          description: Jupyter service started
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/JupyterService'
  /v1/jupyter/services/{serviceId}:
    delete:
      summary: Stop Jupyter service
      parameters:
        - name: serviceId
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Service stopped
  /ws:
    get:
      summary: WebSocket connection
      description: |
        WebSocket endpoint for real-time task updates.

        ## Message Types
        - `task_update`: Task status changes
        - `task_complete`: Task finished
        - `ping`: Keep-alive (respond with `pong`)
      security:
        - ApiKeyAuth: []
      responses:
        '101':
          description: WebSocket connection established
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key for authentication
  schemas:
    HealthResponse:
      type: object
      properties:
        status:
          type: string
          enum: [healthy, degraded, unhealthy]
        version:
          type: string
        timestamp:
          type: string
          format: date-time
    Task:
      type: object
      properties:
        id:
          type: string
          description: Unique task identifier
        job_name:
          type: string
          pattern: '^[a-zA-Z0-9_-]+$'
          maxLength: 64
        status:
          type: string
          enum: [queued, preparing, running, collecting, completed, failed]
        priority:
          type: integer
          minimum: 1
          maximum: 10
          default: 5
        created_at:
          type: string
          format: date-time
        started_at:
          type: string
          format: date-time
        ended_at:
          type: string
          format: date-time
        worker_id:
          type: string
        error:
          type: string
        output:
          type: string
        entrypoint:
          type: string
          description: Entrypoint script or command executed for this task
        snapshot_id:
          type: string
        datasets:
          type: array
          items:
            type: string
        cpu:
          type: integer
        memory_gb:
          type: integer
        gpu:
          type: integer
        user_id:
          type: string
        retry_count:
          type: integer
        max_retries:
          type: integer
        plugin_status:
          type: object
          additionalProperties:
            $ref: '#/components/schemas/PluginStatus'
          description: Status of tracking plugins for this task
        node_assignments:
          type: array
          items:
            $ref: '#/components/schemas/NodeAssignment'
          description: Worker node assignments for multi-node jobs
        priority_aged:
          type: number
          description: Effective priority with aging applied
    CreateTaskRequest:
      type: object
      required:
        - job_name
      properties:
        job_name:
          type: string
          pattern: '^[a-zA-Z0-9_-]+$'
          maxLength: 64
          description: Unique identifier for the job
        priority:
          type: integer
          minimum: 1
          maximum: 10
          default: 5
        args:
          type: string
          description: Command-line arguments for the entrypoint
        entrypoint:
          type: string
          description: Entrypoint script or command (e.g., train.py, run.sh, /bin/bash -c "echo hello")
          examples:
            - train.py
            - run.sh
            - /bin/bash -c "python train.py --epochs 10"
        snapshot_id:
          type: string
          description: Reference to experiment snapshot
        datasets:
          type: array
          items:
            type: string
        dataset_specs:
          type: array
          items:
            $ref: '#/components/schemas/DatasetSpec'
        cpu:
          type: integer
          description: CPU cores requested
        memory_gb:
          type: integer
          description: Memory (GB) requested
        gpu:
          type: integer
          description: GPUs requested
        metadata:
          type: object
          additionalProperties:
            type: string
    DatasetSpec:
      type: object
      properties:
        name:
          type: string
        source:
          type: string
        sha256:
          type: string
        mount_path:
          type: string
    TaskList:
      type: object
      properties:
        tasks:
          type: array
          items:
            $ref: '#/components/schemas/Task'
        total:
          type: integer
        limit:
          type: integer
        offset:
          type: integer
    QueueStats:
      type: object
      properties:
        queued:
          type: integer
          description: Tasks waiting to run
        running:
          type: integer
          description: Tasks currently executing
        completed:
          type: integer
          description: Tasks completed today
        failed:
          type: integer
          description: Tasks failed today
        workers:
          type: integer
          description: Active workers
    Experiment:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        commit_id:
          type: string
        created_at:
          type: string
          format: date-time
        status:
          type: string
          enum: [active, archived, deleted]
    CreateExperimentRequest:
      type: object
      required:
        - name
      properties:
        name:
          type: string
          maxLength: 128
        description:
          type: string
    JupyterService:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        status:
          type: string
          enum: [starting, running, stopping, stopped, error]
        url:
          type: string
          format: uri
        token:
          type: string
        created_at:
          type: string
          format: date-time
    StartJupyterRequest:
      type: object
      required:
        - name
      properties:
        name:
          type: string
        workspace:
          type: string
        image:
          type: string
          default: jupyter/pytorch:latest
    PluginConfig:
      type: object
      properties:
        enabled:
          type: boolean
        mode:
          type: string
          enum: [sidecar, remote, disabled]
        image:
          type: string
        settings:
          type: object
          additionalProperties: true
    PluginStatus:
      type: object
      properties:
        name:
          type: string
        status:
          type: string
          enum: [healthy, unhealthy, starting, stopped]
        url:
          type: string
        last_check:
          type: string
          format: date-time
    NodeAssignment:
      type: object
      properties:
        node_id:
          type: integer
        worker_id:
          type: string
        slot_assigned:
          type: boolean
    Plugin:
      type: object
      properties:
        name:
          type: string
          description: Plugin name
        enabled:
          type: boolean
          description: Whether plugin is enabled
        mode:
          type: string
          enum: [sidecar, remote, disabled]
          description: Provisioning mode
        status:
          $ref: '#/components/schemas/PluginStatus'
          description: Current plugin status
        config:
          $ref: '#/components/schemas/PluginConfig'
        requires_restart:
          type: boolean
          description: Whether plugin requires restart on config change
        version:
          type: string
          description: Plugin version
    Worker:
      type: object
      properties:
        id:
          type: string
          description: Worker unique identifier
        connected_at:
          type: string
          format: date-time
          description: When worker connected
        last_heartbeat:
          type: string
          format: date-time
          description: Last heartbeat timestamp
        capabilities:
          type: object
          properties:
            gpu_count:
              type: integer
              description: Number of GPUs
            gpu_type:
              type: string
              description: GPU type (e.g., A100, H100)
            cpu_cores:
              type: integer
            memory_gb:
              type: integer
        slots:
          type: object
          properties:
            batch_available:
              type: integer
            batch_total:
              type: integer
            service_available:
              type: integer
            service_total:
              type: integer
        active_tasks:
          type: array
          items:
            type: string
          description: IDs of tasks currently running on this worker
        status:
          type: string
          enum: [active, draining, offline]
    SchedulerStatus:
      type: object
      properties:
        workers_total:
          type: integer
        workers_active:
          type: integer
        workers_draining:
          type: integer
        batch_queue_depth:
          type: integer
        service_queue_depth:
          type: integer
        tasks_running:
          type: integer
        tasks_completed_24h:
          type: integer
        reservations_active:
          type: integer
        timestamp:
          type: string
          format: date-time
    Reservation:
      type: object
      properties:
        id:
          type: string
        user_id:
          type: string
        gpu_count:
          type: integer
        gpu_type:
          type: string
        node_count:
          type: integer
        expires_at:
          type: string
          format: date-time
        status:
          type: string
          enum: [active, claimed, expired]
    CreateReservationRequest:
      type: object
      required:
        - gpu_count
      properties:
        gpu_count:
          type: integer
          minimum: 1
        gpu_type:
          type: string
        node_count:
          type: integer
          minimum: 1
          default: 1
        expires_minutes:
          type: integer
          default: 30
    AuditEvent:
      type: object
      properties:
        timestamp:
          type: string
          format: date-time
        event_type:
          type: string
          enum: [job_queued, job_started, job_completed, file_access, auth_attempt, plugin_configured, scheduler_drain, audit_verified]
        user_id:
          type: string
        resource:
          type: string
          description: Resource being acted upon
        action:
          type: string
          description: Action performed
        success:
          type: boolean
        ip_address:
          type: string
        error:
          type: string
        prev_hash:
          type: string
          description: Previous event hash in chain
        event_hash:
          type: string
          description: This event's hash
        sequence_num:
          type: integer
          description: Position in audit chain
        metadata:
          type: object
          additionalProperties: true
    AuditEventList:
      type: object
      properties:
        events:
          type: array
          items:
            $ref: '#/components/schemas/AuditEvent'
        total:
          type: integer
        limit:
          type: integer
        offset:
          type: integer
    VerificationResult:
      type: object
      properties:
        valid:
          type: boolean
        total_events:
          type: integer
        first_tampered:
          type: integer
          description: Sequence number of first tampered event (if any)
        chain_root_hash:
          type: string
        verified_at:
          type: string
          format: date-time
    ErrorResponse:
      type: object
      required:
        - error
        - code
        - trace_id
      properties:
        error:
          type: string
          description: Sanitized error message
        code:
          type: string
          enum: [BAD_REQUEST, UNAUTHORIZED, FORBIDDEN, NOT_FOUND, CONFLICT, RATE_LIMITED, INTERNAL_ERROR, SERVICE_UNAVAILABLE, VALIDATION_ERROR]
        trace_id:
          type: string
          description: Support correlation ID
  tags:
    - name: Plugins
      description: Plugin management endpoints
    - name: Scheduler
      description: Scheduler and worker management
    - name: Audit
      description: Audit log and chain verification
  responses:
    BadRequest:
      description: Invalid request
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error: Invalid request format
            code: BAD_REQUEST
            trace_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
    Unauthorized:
      description: Authentication required
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error: Invalid or missing API key
            code: UNAUTHORIZED
            trace_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
    Forbidden:
      description: Insufficient permissions
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error: Insufficient permissions
            code: FORBIDDEN
            trace_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
    NotFound:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error: Resource not found
            code: NOT_FOUND
            trace_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
    ValidationError:
      description: Validation failed
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error: Validation failed
            code: VALIDATION_ERROR
            trace_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
    RateLimited:
      description: Too many requests
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error: Rate limit exceeded
            code: RATE_LIMITED
            trace_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
      headers:
        Retry-After:
          schema:
            type: integer
          description: Seconds until rate limit resets
    InternalError:
      description: Internal server error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error: An error occurred
            code: INTERNAL_ERROR
            trace_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890