> ## Documentation Index > Fetch the complete documentation index at: https://docs.slng.ai/llms.txt > Use this file to discover all available pages before exploring further. # Connect MCP Server > Open a live connection to the MCP server and refresh its stored capabilities and tool list. Returns a ConnectResult with the connection status, round-trip latency, reported server info, protocol version, discovered tools, an event log, and any error. Secret values are scrubbed from the result. ## OpenAPI ````yaml /api-reference/agents/shared-resources.oas.yaml post /v1/agents/mcp-servers/{server_id}/connect openapi: 3.1.0 info: title: SLNG Agent Resources API version: 1.0.0 description: >- Public control-plane API for agent resources: tools, MCP servers, Vault secrets and variables, and client models. servers: - url: https://api.agents.slng.ai description: Production security: - bearerAuth: [] tags: - name: Tools description: Create, test, publish, version, and attach agent tools. x-page-icon: wrench - name: MCP servers description: Configure MCP servers and refresh their live capabilities. x-page-icon: plug - name: Vault description: >- Store organisation secrets and readable variables without exposing secret values. x-page-icon: key - name: Client models description: Manage bring-your-own LLM provider credentials. x-page-icon: brain paths: /v1/agents/mcp-servers/{server_id}/connect: post: tags: - MCP servers summary: Connect MCP Server description: >- Open a live connection to the MCP server and refresh its stored capabilities and tool list. Returns a ConnectResult with the connection status, round-trip latency, reported server info, protocol version, discovered tools, an event log, and any error. Secret values are scrubbed from the result. operationId: connectMcp parameters: - name: server_id in: path required: true description: >- UUID of the MCP server to probe. A server in another organisation or one that is soft-deleted returns 404. schema: type: string format: uuid title: Server Id responses: '200': description: The connection probe result. content: application/json: schema: $ref: '#/components/schemas/ConnectResult' example: status: connected latency_ms: 142 server_info: name: example-mcp protocol_version: '2025-06-18' capabilities: tools: - name: search description: Search the crawl index input_schema: type: object schema_hash: >- 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08 truncated: false pages_fetched: 1 events: - direction: sent method: initialize ts: '2026-08-01T12:00:00Z' summary: Opened connection '401': $ref: '#/components/responses/UnauthorizedError' '403': $ref: '#/components/responses/ForbiddenError' '404': $ref: '#/components/responses/NotFoundError' '409': $ref: '#/components/responses/ConflictError' '422': $ref: '#/components/responses/ValidationError' '429': $ref: '#/components/responses/RateLimitError' '500': $ref: '#/components/responses/InternalServerError' components: schemas: ConnectResult: description: >- Outcome of a live connection probe, including the connection status, round-trip latency, reported server info and protocol version, discovered capabilities, an ordered event log, and any error. Secret values are scrubbed. properties: status: type: string enum: - connected - failed title: Status latency_ms: type: integer title: Latency Ms server_info: anyOf: - type: object additionalProperties: true - type: 'null' title: Server Info protocol_version: anyOf: - type: string - type: 'null' title: Protocol Version capabilities: anyOf: - $ref: '#/components/schemas/McpCapabilities' - type: 'null' events: items: $ref: '#/components/schemas/McpEvent' type: array title: Events error: anyOf: - type: string - type: 'null' title: Error additionalProperties: false type: object required: - status - latency_ms title: ConnectResult McpCapabilities: description: >- Tools discovered from the MCP server, with flags for whether discovery was truncated and how many pages were fetched. properties: tools: items: $ref: '#/components/schemas/McpTool' type: array title: Tools truncated: type: boolean title: Truncated default: false pages_fetched: type: integer minimum: 0 title: Pages Fetched default: 0 additionalProperties: false type: object title: McpCapabilities McpEvent: description: >- One entry in the connection probe log, recording a single sent, received, or error message with its method, timestamp, and a short summary. properties: direction: type: string enum: - sent - received - error title: Direction method: type: string title: Method ts: type: string title: Ts summary: type: string title: Summary additionalProperties: false type: object required: - direction - method - ts - summary title: McpEvent ApiErrorResponse: type: object description: Standard error envelope returned for failed requests. required: - detail - error properties: detail: type: string description: Short human-readable summary of the error. error: $ref: '#/components/schemas/ApiErrorDetail' example: detail: A shared secret or variable named 'STRIPE_KEY' already exists error: code: RESOURCE_CONFLICT message: A shared secret or variable named 'STRIPE_KEY' already exists request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b McpTool: description: >- A tool exposed by the MCP server, with its input and output JSON schemas and a hash used to detect schema drift. properties: name: type: string maxLength: 200 minLength: 1 title: Name description: anyOf: - type: string - type: 'null' title: Description input_schema: additionalProperties: true type: object title: Input Schema output_schema: anyOf: - type: object additionalProperties: true - type: 'null' title: Output Schema schema_hash: type: string pattern: ^[0-9a-f]{64}$ title: Schema Hash additionalProperties: false type: object required: - name - schema_hash title: McpTool ApiErrorDetail: type: object description: Structured error detail carried inside an error response. required: - code - message properties: code: type: string description: Stable machine-readable error code. example: RESOURCE_CONFLICT message: type: string description: Human-readable explanation of the error. example: A shared secret or variable named STRIPE_KEY already exists request_id: type: - string - 'null' description: Identifier for this request, useful when contacting support. example: req_01H8XY7Z9QEXAMPLE retryable: type: boolean description: Whether retrying the same request may succeed. example: false fields: type: array description: >- Per-field validation problems, when the error relates to specific request fields. items: type: object additionalProperties: true example: [] example: code: PUBLIC_SHARED_RESOURCES_DISABLED message: Public shared resources are disabled for this organisation request_id: req_01H8XY7Z9QEXAMPLE retryable: false responses: UnauthorizedError: description: The API key is missing or invalid. content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' example: detail: Invalid API key error: code: AUTH_REQUIRED message: Invalid API key request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b retryable: false ForbiddenError: description: >- The caller lacks permission, or the public shared-resource API is disabled for the organisation. content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' examples: permission_denied: summary: Owner or admin access required value: detail: Organisation owner or admin access required error: code: PERMISSION_DENIED message: Organisation owner or admin access required request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b retryable: false api_disabled: summary: Public shared-resource API disabled for the organisation value: detail: >- Public shared-resource API access is disabled for this organisation error: code: PUBLIC_SHARED_RESOURCES_DISABLED message: >- Public shared-resource API access is disabled for this organisation request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b retryable: false NotFoundError: description: The requested resource does not exist for this organisation. content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' example: detail: The requested resource was not found. error: code: RESOURCE_NOT_FOUND message: The requested resource was not found. request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b ConflictError: description: The request conflicts with the current state of the resource. content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' example: detail: The request conflicts with the current state of the resource. error: code: RESOURCE_CONFLICT message: The request conflicts with the current state of the resource. request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b ValidationError: description: Request validation failed. See error.fields for the offending fields. content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' example: detail: >- Request validation failed. Fix the highlighted fields and try again. error: code: VALIDATION_FAILED message: >- Request validation failed. Fix the highlighted fields and try again. request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b retryable: false fields: - path: name message: >- Name must be SCREAMING_SNAKE_CASE: start with a letter, then letters, digits, or underscores (e.g. STRIPE_API_KEY) RateLimitError: description: >- The organisation exceeded its request rate limit. Retry after the window resets. headers: Retry-After: schema: type: integer X-RateLimit-Limit: schema: type: integer X-RateLimit-Remaining: schema: type: integer content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' example: detail: Rate limit exceeded. Maximum 60 requests per 60 seconds. error: code: INTERNAL_ERROR message: Rate limit exceeded. Maximum 60 requests per 60 seconds. request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b retryable: false InternalServerError: description: The request failed unexpectedly. Secret values are never exposed. content: application/json: schema: $ref: '#/components/schemas/ApiErrorResponse' example: detail: An unexpected error occurred. error: code: INTERNAL_ERROR message: An unexpected error occurred. request_id: 018f9b2c-7e4a-7c3d-9a1b-2c3d4e5f6a7b retryable: false securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: SLNG API key description: Your SLNG consumer API key. ````