LangChain

LangChain fleet mcp API

The fleet mcp API from LangChain — 4 operation(s) for fleet mcp.

GitHub OpenAPI

Operations 7

GET /v1/fleet/mcp/tools List MCP tools #
GET /v1/platform/fleet/mcp-servers List MCP servers #
POST /v1/platform/fleet/mcp-servers Create MCP server #
GET /v1/platform/fleet/mcp-servers/{mcp_server_id} Get MCP server #
DELETE /v1/platform/fleet/mcp-servers/{mcp_server_id} Delete MCP server #
PATCH /v1/platform/fleet/mcp-servers/{mcp_server_id} Update MCP server #
POST /v1/platform/fleet/mcp-servers/{mcp_server_id}/oauth-provider Register per-user MCP OAuth provider #

Documentation

📖
Documentation
https://docs.langchain.com/langsmith
📖
Authentication
https://docs.langchain.com/langsmith/create-account-api-key

Specifications

⚙
OpenAPI
https://artifacts.apis.io/langchain/openapi/langchain-fleet-mcp-api-openapi.yml

Other Resources

🔗
Signup
https://smith.langchain.com/

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OpenAPI Specification

langchain-fleet-mcp-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: LangSmith fleet 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.'
  version: 0.1.0
servers:
- url: /
tags:
- name: fleet mcp
paths:
  /v1/fleet/mcp/tools:
    get:
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      description: Returns tools from a remote MCP server. Serves cached results when fresh, otherwise fetches from the remote server and caches the response.
      tags:
      - fleet mcp
      summary: List MCP tools
      parameters:
      - description: MCP server URL to fetch tools from
        name: url
        in: query
        required: true
        schema:
          type: string
          title: Url
      - description: OAuth provider ID for token-based auth
        name: oauth_provider_id
        in: query
        schema:
          type: string
          title: Oauth Provider Id
      - description: Skip cache and fetch fresh tools
        name: force_refresh
        in: query
        schema:
          type: boolean
          title: Force Refresh
      - description: User ID override (service-key callers)
        name: ls_user_id
        in: query
        schema:
          type: string
          title: Ls User Id
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcptools.ListToolsResponse'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcptools.ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcptools.ErrorResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcptools.ErrorResponse'
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcptools.ErrorResponse'
        '502':
          description: Bad Gateway
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcptools.ErrorResponse'
      operationId: getV1FleetMcpTools
      x-operation-id-source: derived
  /v1/platform/fleet/mcp-servers:
    get:
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      description: Returns MCP servers visible to the caller after ABAC filtering. Service-key callers may pass X-Ls-User-Id to resolve per-user OAuth providers.
      tags:
      - fleet mcp
      summary: List MCP servers
      parameters:
      - description: User UUID for per-user OAuth resolution (service keys)
        name: X-Ls-User-Id
        in: header
        schema:
          type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.McpServer'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '503':
          description: Service Unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
      operationId: getV1PlatformFleetMcpServers
      x-operation-id-source: derived
    post:
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      description: Registers a new MCP server configuration for the workspace.
      tags:
      - fleet mcp
      summary: Create MCP server
      parameters: []
      responses:
        '201':
          description: Created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.McpServer'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '409':
          description: Conflict
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '503':
          description: Service Unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.CreateMcpServerPayload'
      operationId: postV1PlatformFleetMcpServers
      x-operation-id-source: derived
  /v1/platform/fleet/mcp-servers/{mcp_server_id}:
    get:
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      description: Returns a single MCP server by ID.
      tags:
      - fleet mcp
      summary: Get MCP server
      parameters:
      - description: MCP server ID
        name: mcp_server_id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.McpServer'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '503':
          description: Service Unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
      operationId: getV1PlatformFleetMcpServersByMcpServerId
      x-operation-id-source: derived
    delete:
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      description: Deletes an MCP server configuration.
      tags:
      - fleet mcp
      summary: Delete MCP server
      parameters:
      - description: MCP server ID
        name: mcp_server_id
        in: path
        required: true
        schema:
          type: string
      responses:
        '204':
          description: No Content
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '503':
          description: Service Unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
      operationId: deleteV1PlatformFleetMcpServersByMcpServerId
      x-operation-id-source: derived
    patch:
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      description: Partially updates an MCP server. Tool list cache is invalidated on success.
      tags:
      - fleet mcp
      summary: Update MCP server
      parameters:
      - description: MCP server ID
        name: mcp_server_id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.McpServer'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '503':
          description: Service Unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.UpdateMcpServerPayload'
      operationId: patchV1PlatformFleetMcpServersByMcpServerId
      x-operation-id-source: derived
  /v1/platform/fleet/mcp-servers/{mcp_server_id}/oauth-provider:
    post:
      security:
      - API Key: []
      - Tenant ID: []
      - Bearer Auth: []
      description: Discovers and registers an OAuth provider for a user against an MCP server configured with per-user dynamic client mode. Idempotent when a mapping already exists.
      tags:
      - fleet mcp
      summary: Register per-user MCP OAuth provider
      parameters:
      - description: MCP server ID
        name: mcp_server_id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.RegisterOAuthProviderResponse'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
        '503':
          description: Service Unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mcp_servers.McpServerAPIError'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.RegisterOAuthProviderPayload'
      operationId: postV1PlatformFleetMcpServersByMcpServerIdOauthProvider
      x-operation-id-source: derived
components:
  schemas:
    mcptools.Tool:
      type: object
      properties:
        annotations:
          type: object
          additionalProperties: {}
        description:
          type: string
        inputSchema:
          type: object
          additionalProperties: {}
        name:
          type: string
    mcp_servers.McpServerAPIError:
      type: object
      properties:
        detail:
          type: string
        error:
          type: string
    mcptools.ErrorResponse:
      type: object
      properties:
        code:
          type: string
        detail:
          type: string
        status:
          type: integer
        type:
          type: string
    langchain_com_smith_fleet_mcp_servers.McpServer:
      type: object
      properties:
        auth_type:
          $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.AuthType'
        can_invoke:
          type: boolean
        created_at:
          type: string
        external_system_id:
          type: string
        headers:
          type: array
          items:
            type: object
            additionalProperties: true
        id:
          type: string
        mcp_vendor_id:
          type: string
        name:
          type: string
        oauth_mode:
          $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.OAuthMode'
        oauth_provider_id:
          type: string
        tenant_id:
          type: string
        updated_at:
          type: string
        url:
          type: string
        vendor_id:
          type: string
    langchain_com_smith_fleet_mcp_servers.RegisterOAuthProviderPayload:
      type: object
      properties:
        ls_user_id:
          type: string
    langchain_com_smith_fleet_mcp_servers.RegisterOAuthProviderResponse:
      type: object
      properties:
        oauth_provider_id:
          type: string
    mcptools.ListToolsResponse:
      type: object
      properties:
        cached:
          type: boolean
        fetched_at:
          type: string
        tools:
          type: array
          items:
            $ref: '#/components/schemas/mcptools.Tool'
    langchain_com_smith_fleet_mcp_servers.OAuthMode:
      type: string
      enum:
      - legacy_shared_provider
      - per_user_dynamic_client
      x-enum-varnames:
      - OAuthModeLegacySharedProvider
      - OAuthModePerUserDynamicClient
    langchain_com_smith_fleet_mcp_servers.AuthType:
      type: string
      enum:
      - headers
      - oauth
      x-enum-varnames:
      - AuthTypeHeaders
      - AuthTypeOAuth
    langchain_com_smith_fleet_mcp_servers.CreateMcpServerPayload:
      type: object
      required:
      - name
      - url
      properties:
        auth_type:
          $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.AuthType'
        external_system_id:
          type: string
        headers:
          type: array
          items:
            type: object
            additionalProperties: true
        name:
          type: string
        oauth_mode:
          $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.OAuthMode'
        oauth_provider_id:
          type: string
        url:
          type: string
        vendor_id:
          type: string
    langchain_com_smith_fleet_mcp_servers.UpdateMcpServerPayload:
      type: object
      properties:
        auth_type:
          $ref: '#/components/schemas/langchain_com_smith_fleet_mcp_servers.AuthType'
        headers:
          type: array
          items:
            type: object
            additionalProperties: true
        oauth_provider_id:
          type: string
        url:
          type: string
  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