openapi: 3.0.3
info:
  title: Temporal HTTP Cluster Namespaces 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: Namespaces
  description: Read namespace metadata (read-only subset over HTTP).
paths:
  /namespaces/{namespace}:
    parameters:
    - $ref: '#/components/parameters/Namespace'
    get:
      operationId: describeNamespace
      tags:
      - Namespaces
      summary: Describe a namespace
      description: Returns configuration and metadata for a namespace. Maps to the gRPC DescribeNamespace RPC. Namespace creation and updates on Temporal Cloud are performed through the Cloud Operations API, not this data-plane HTTP API.
      responses:
        '200':
          description: Namespace configuration and metadata.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /namespaces:
    get:
      operationId: listNamespaces
      tags:
      - Namespaces
      summary: List namespaces
      description: Lists namespaces visible to the caller. Maps to the gRPC ListNamespaces RPC.
      parameters:
      - name: page_size
        in: query
        required: false
        schema:
          type: integer
      - name: next_page_token
        in: query
        required: false
        schema:
          type: string
          format: byte
      responses:
        '200':
          description: A page of namespaces.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    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
  parameters:
    Namespace:
      name: namespace
      in: path
      required: true
      description: The Temporal namespace.
      schema:
        type: string
  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
    NotFound:
      description: The requested workflow execution or namespace was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
  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.'