openapi: 3.0.3
info:
  title: Langbase Agent Threads API
  description: Representative OpenAPI description of the Langbase serverless AI developer platform. All endpoints are served from https://api.langbase.com and authenticated with a Bearer API key. Generative endpoints (Pipes run, Agent run) return Server-Sent Events (SSE) when `stream` is true. This document is a faithful representative model authored by API Evangelist and is not the provider's official specification.
  termsOfService: https://langbase.com/terms
  contact:
    name: Langbase Support
    url: https://langbase.com/support
  version: '1.0'
servers:
- url: https://api.langbase.com
  description: Langbase production API
security:
- api_key: []
tags:
- name: Threads
paths:
  /v1/threads:
    post:
      operationId: createThread
      tags:
      - Threads
      summary: Create a conversation thread.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateThreadRequest'
      responses:
        '200':
          description: The created thread.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Thread'
  /v1/threads/{threadId}:
    get:
      operationId: getThread
      tags:
      - Threads
      summary: Get a thread.
      parameters:
      - in: path
        name: threadId
        required: true
        schema:
          type: string
      responses:
        '200':
          description: A thread object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Thread'
    patch:
      operationId: updateThread
      tags:
      - Threads
      summary: Update a thread.
      parameters:
      - in: path
        name: threadId
        required: true
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                metadata:
                  type: object
                  additionalProperties:
                    type: string
      responses:
        '200':
          description: The updated thread.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Thread'
    delete:
      operationId: deleteThread
      tags:
      - Threads
      summary: Delete a thread.
      parameters:
      - in: path
        name: threadId
        required: true
        schema:
          type: string
      responses:
        '200':
          description: A delete confirmation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DeleteResponse'
  /v1/threads/{threadId}/messages:
    get:
      operationId: listMessages
      tags:
      - Threads
      summary: List messages in a thread.
      parameters:
      - in: path
        name: threadId
        required: true
        schema:
          type: string
      responses:
        '200':
          description: A list of messages.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Message'
    post:
      operationId: appendMessages
      tags:
      - Threads
      summary: Append messages to a thread.
      parameters:
      - in: path
        name: threadId
        required: true
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                $ref: '#/components/schemas/Message'
      responses:
        '200':
          description: The appended messages.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Message'
components:
  schemas:
    Message:
      type: object
      properties:
        role:
          type: string
          enum:
          - system
          - user
          - assistant
          - tool
        content:
          type: string
        name:
          type: string
      required:
      - role
    Thread:
      type: object
      properties:
        id:
          type: string
        metadata:
          type: object
          additionalProperties:
            type: string
        createdAt:
          type: integer
    DeleteResponse:
      type: object
      properties:
        success:
          type: boolean
        name:
          type: string
    CreateThreadRequest:
      type: object
      properties:
        metadata:
          type: object
          additionalProperties:
            type: string
        messages:
          type: array
          items:
            $ref: '#/components/schemas/Message'
  securitySchemes:
    api_key:
      type: http
      scheme: bearer
      bearerFormat: apiKey