> ## Documentation Index > Fetch the complete documentation index at: https://docs.engini.ai/llms.txt > Use this file to discover all available pages before exploring further. # List the tools available to an MCP server from one of its connections. > Returns every tool the given connection's application offers, so a caller can choose which of them to expose. These are the candidates for a connection entry's toolSlugs on the update endpoint; an empty toolSlugs exposes all of them. Returns an error if the MCP server or the connection does not belong to the caller's account. ## OpenAPI ````yaml /api-reference/openapi.json get /v1/mcpservers/{mcpServerToken}/available-tools openapi: 3.0.0 info: title: Engini DeveloperAPI version: v1 description: 'Merged public developer API spec: Identity + WorkflowApi.' servers: - url: https://api.engini.io security: - Bearer: [] - ApiKey: [] tags: - name: Auth description: Identify the caller a Developer API request is authenticated as. - name: Applications description: >- Discover the applications (toolkits) available in Engini and their connection requirements. - name: Tools description: Browse and execute the tools exposed by Engini applications. - name: Toolsets description: Manage toolsets - named groupings of connections and tools. - name: McpServers description: >- Inspect and maintain MCP servers - the account-wide endpoints that expose Engini tools and workflows over the Model Context Protocol. Distinct from the MCPClient connection kind, which is Engini consuming a third-party MCP server. - name: Connections description: >- Manage connections to applications, including OAuth sign-in and default-connection selection. - name: Triggers description: >- Create triggers that fire when something changes in a connected app, and manage the destinations their events are delivered to. paths: /v1/mcpservers/{mcpServerToken}/available-tools: get: tags: - McpServers summary: List the tools available to an MCP server from one of its connections. description: >- Returns every tool the given connection's application offers, so a caller can choose which of them to expose. These are the candidates for a connection entry's toolSlugs on the update endpoint; an empty toolSlugs exposes all of them. Returns an error if the MCP server or the connection does not belong to the caller's account. operationId: McpServers_GetAvailableTools parameters: - name: mcpServerToken in: path required: true description: The token identifying the MCP server. schema: type: string x-position: 1 - name: connectionId in: query description: The connection whose available tools to list. schema: type: integer format: int32 x-position: 2 responses: '200': description: The tools the connection makes available. content: application/json: schema: type: array items: $ref: '#/components/schemas/McpAvailableToolDTO' '400': description: Bad request - malformed body or invalid parameters. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized - missing or invalid bearer token. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: Forbidden - the caller lacks access to the resource. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Not found - the resource does not exist. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: Too many requests - rate limit exceeded. headers: Retry-After: description: Number of seconds to wait before retrying. schema: type: integer content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error - an unexpected error occurred. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - Bearer: [] - ApiKey: [] components: schemas: McpAvailableToolDTO: type: object description: >- A tool offered by a connection, as returned by the MCP server's available-tools lookup. additionalProperties: false required: - toolName - isMandatory properties: toolName: type: string description: Name the tool is addressable by over MCP. description: type: string description: Human-readable description of what the tool does. nullable: true isMandatory: type: boolean description: >- Whether the tool is always exposed regardless of the selected tool set. ErrorResponse: type: object description: >- Unified error envelope for every non-200 response from /api/DeveloperAPI/v1/*. See applications-tools-spec.md ยง"Error envelope". additionalProperties: false required: - errorCode - message - requestId - timestamp - path properties: errorCode: type: string description: Machine-readable error code identifying the failure. message: type: string description: Human-readable error message. requestId: type: string description: Identifier of the request, for support/correlation. timestamp: type: string description: Timestamp when the error occurred (ISO 8601). path: type: string description: Request path that produced the error. details: type: array description: Per-field validation details, when applicable. nullable: true items: $ref: '#/components/schemas/ErrorDetail' ErrorDetail: type: object description: A single field-level error detail within an ErrorResponse. additionalProperties: false required: - field - issue properties: field: type: string description: Name of the field the issue relates to. issue: type: string description: Description of the issue with the field. securitySchemes: Bearer: type: http description: Enter your JWT token scheme: bearer bearerFormat: JWT ApiKey: type: apiKey description: >- Opaque Developer API key (prefix `eng_`). Authenticates as the key's owner and resolves the account automatically. name: x-api-key in: header ````