Temporal Workflow Lifecycle API

openapi: 3.2.0
info:
  title: Temporal HTTP Cluster Workflow Lifecycle API
  description: The Temporal HTTP API is a first-party grpc-gateway that maps a REST/JSON subset of the Temporal WorkflowService (gRPC) onto HTTP paths under `/api/v1`. Temporal's primary and complete API surface is gRPC (WorkflowService and OperatorService, defined as protobuf in github.com/temporalio/api); this HTTP API exists for automation, CI/CD, and environments where gRPC is impractical, and it exposes only a subset of the gRPC methods. The worker task-polling and task-completion RPCs (PollWorkflowTaskQueue, PollActivityTaskQueue, RespondWorkflowTaskCompleted, PollNexusTaskQueue, and similar) are NOT exposed over HTTP and remain gRPC-only. On Temporal Cloud the HTTP API is served per namespace over HTTPS; self-hosted it is served by the frontend service when the HTTP port is enabled. Requests authenticate with a Bearer API key (or mTLS on self-hosted). The paths and verbs below are drawn from the google.api.http annotations on the WorkflowService proto and are modeled here, not exhaustively confirmed against a live namespace.
  version: '1.0'
  contact:
    name: Temporal Technologies
    url: https://temporal.io
  license:
    name: MIT
    url: https://github.com/temporalio/api/blob/master/LICENSE
servers:
- url: https://{namespace}.{account}.tmprl.cloud/api/v1
  description: Temporal Cloud (per-namespace HTTP API endpoint)
  variables:
    namespace:
      default: your-namespace
      description: Your Temporal Cloud namespace name.
    account:
      default: your-account
      description: Your Temporal Cloud account (short) ID.
- url: http://localhost:7243/api/v1
  description: Self-hosted frontend HTTP API (when the HTTP port is enabled)
security:
- bearerAuth: []
tags:
- name: Workflow Lifecycle
  description: Cancel, terminate, and reset workflow executions.
paths:
  /namespaces/{namespace}/workflows/{workflow_execution.workflow_id}/cancel:
    parameters:
    - $ref: '#/components/parameters/Namespace'
    - $ref: '#/components/parameters/WorkflowExecutionWorkflowId'
    post:
      operationId: requestCancelWorkflowExecution
      tags:
      - Workflow Lifecycle
      summary: Request cancellation of a workflow execution
      description: Requests graceful cancellation of a workflow execution. Maps to the gRPC RequestCancelWorkflowExecution RPC.
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      responses:
        '200':
          description: Cancellation was requested.
          content:
            application/json:
              schema:
                type: object
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /namespaces/{namespace}/workflows/{workflow_execution.workflow_id}/terminate:
    parameters:
    - $ref: '#/components/parameters/Namespace'
    - $ref: '#/components/parameters/WorkflowExecutionWorkflowId'
    post:
      operationId: terminateWorkflowExecution
      tags:
      - Workflow Lifecycle
      summary: Terminate a workflow execution
      description: Forcefully terminates a workflow execution. Maps to the gRPC TerminateWorkflowExecution RPC.
      requestBody:
        required: false
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TerminateWorkflowExecutionRequest'
      responses:
        '200':
          description: The workflow execution was terminated.
          content:
            application/json:
              schema:
                type: object
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /namespaces/{namespace}/workflows/{workflow_execution.workflow_id}/reset:
    parameters:
    - $ref: '#/components/parameters/Namespace'
    - $ref: '#/components/parameters/WorkflowExecutionWorkflowId'
    post:
      operationId: resetWorkflowExecution
      tags:
      - Workflow Lifecycle
      summary: Reset a workflow execution
      description: Resets a workflow execution to a prior point in its history, creating a new run. Maps to the gRPC ResetWorkflowExecution RPC.
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      responses:
        '200':
          description: The reset run ID.
          content:
            application/json:
              schema:
                type: object
                properties:
                  run_id:
                    type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    Payloads:
      type: object
      description: Temporal payloads envelope. Each payload carries base64-encoded metadata and data.
      properties:
        payloads:
          type: array
          items:
            type: object
            properties:
              metadata:
                type: object
                additionalProperties:
                  type: string
                  format: byte
              data:
                type: string
                format: byte
    TerminateWorkflowExecutionRequest:
      type: object
      properties:
        workflowExecution:
          type: object
          properties:
            workflowId:
              type: string
            runId:
              type: string
        reason:
          type: string
        details:
          $ref: '#/components/schemas/Payloads'
        identity:
          type: string
    Status:
      type: object
      description: A google.rpc.Status-style error payload.
      properties:
        code:
          type: integer
        message:
          type: string
        details:
          type: array
          items:
            type: object
            additionalProperties: true
  responses:
    NotFound:
      description: The requested workflow execution or namespace was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
  parameters:
    Namespace:
      name: namespace
      in: path
      required: true
      description: The Temporal namespace.
      schema:
        type: string
    WorkflowExecutionWorkflowId:
      name: workflow_execution.workflow_id
      in: path
      required: true
      description: The workflow ID of the target execution.
      schema:
        type: string
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Bearer API key. On Temporal Cloud, pass an API key as `Authorization: Bearer <api-key>`. Self-hosted deployments may use mTLS instead. Requests are scoped to the namespace in the path.'