LangChain mcp API

openapi: 3.1.0
info:
  title: LangSmith access_policies mcp API
  description: 'The LangSmith API is used to programmatically create and manage LangSmith resources.


    ## Host

    https://api.smith.langchain.com


    ## Authentication

    To authenticate with the LangSmith API, set the `X-Api-Key` header

    to a valid [LangSmith API key](https://docs.langchain.com/langsmith/create-account-api-key#create-an-api-key).


    '
  version: 0.1.0
servers:
- url: /
tags:
- name: mcp
paths:
  /api/v1/mcp/tools:
    get:
      tags:
      - mcp
      summary: Get Tools
      description: 'Return MCP tools — from cache if fresh, otherwise by fetching from remote.


        On cache miss, tries manifest fetch first (fast), then falls back to full

        MCP handshake. Caches the result before returning.


        Pass force_refresh=true to bypass the cache and always fetch from the

        remote server (the result is still cached via upsert for future requests).


        The ls_user_id query parameter allows service-key callers (which don''t carry

        ls_user_id in auth) to specify the user for per-user OAuth cache lookups.'
      operationId: get_tools_api_v1_mcp_tools_get
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      parameters:
      - name: url
        in: query
        required: true
        schema:
          type: string
          title: Url
      - name: oauth_provider_id
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Oauth Provider Id
      - name: ls_user_id
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Ls User Id
      - name: force_refresh
        in: query
        required: false
        schema:
          type: boolean
          default: false
          title: Force Refresh
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
    delete:
      tags:
      - mcp
      summary: Invalidate Tools Cache
      description: 'Invalidate cached MCP tools for a given server URL.


        Called when a tool call fails with a stale-tools error, so subsequent

        requests to GET /mcp/tools will re-fetch from the remote server.'
      operationId: invalidate_tools_cache_api_v1_mcp_tools_delete
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      parameters:
      - name: url
        in: query
        required: true
        schema:
          type: string
          title: Url
      - name: oauth_provider_id
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Oauth Provider Id
      - name: ls_user_id
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Ls User Id
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
  /api/v1/mcp/proxy:
    get:
      tags:
      - mcp
      summary: Proxy Get
      operationId: proxy_get_api_v1_mcp_proxy_get
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      parameters:
      - name: url
        in: query
        required: true
        schema:
          type: string
          title: Url
      - name: accept_stream
        in: query
        required: false
        schema:
          type: boolean
          default: true
          title: Accept Stream
      - name: timeout
        in: query
        required: false
        schema:
          type: integer
          default: 60
          title: Timeout
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
    post:
      tags:
      - mcp
      summary: Proxy
      operationId: proxy_api_v1_mcp_proxy_post
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ProxyRequest'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationError
    ProxyRequest:
      properties:
        url:
          type: string
          title: Url
        method:
          type: string
          enum:
          - GET
          - POST
          - PUT
          - DELETE
          - PATCH
          - HEAD
          - OPTIONS
          title: Method
          default: GET
        headers:
          anyOf:
          - additionalProperties:
              type: string
            type: object
          - type: 'null'
          title: Headers
          default: {}
        timeout:
          anyOf:
          - type: integer
          - type: 'null'
          title: Timeout
          default: 120
        body:
          anyOf:
          - {}
          - type: 'null'
          title: Body
        oauth_provider_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Oauth Provider Id
      type: object
      required:
      - url
      title: ProxyRequest
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
  securitySchemes:
    API Key:
      type: apiKey
      in: header
      name: X-API-Key
    Tenant ID:
      type: apiKey
      in: header
      name: X-Tenant-Id
    Bearer Auth:
      type: http
      description: Bearer tokens are used to authenticate from the UI. Must also specify x-tenant-id or x-organization-id (for org scoped apis).
      scheme: bearer
    Organization ID:
      type: apiKey
      in: header
      name: X-Organization-Id