Publish Workflow As MCP Tool

Publish a deployed workflow as a tool on an MCP server. The tool's input schema is generated from the deployed workflow's input format, so the workflow must already be deployed. Idempotent per workflow: a server carries at most one tool per workflow, so a repeat call replaces the existing tool and answers 200 with updated: true rather than conflicting. A workspace API key is rejected with 403; use a personal API key.

POST/api/v2/workflow-mcp-servers/{serverId}/tools

Authorization

apiKey
X-API-Key<token>

Your Sim API key, personal or workspace-scoped. Generate one under Settings, then API Keys. Operations that reject workspace keys say so in their own description.

In: header

Path Parameters

serverId*string

Unique workflow-MCP server identifier.

Length1 <= length

Request Body

application/json

The workflow to publish and the tool metadata MCP clients see.

TypeScript Definitions

Use the request body type in TypeScript.

Response Body

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

curl -X POST "https://www.sim.ai/api/v2/workflow-mcp-servers/string/tools" \  -H "X-API-Key: YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "workflowId": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36",    "toolName": "triage_ticket"  }'
{
  "data": {
    "id": "wfmcptool_01J8ZK3QW4M6X2R9T7B5C0V3",
    "serverId": "wfmcp_01J8ZK3QW4M6X2R9T7B5C0V2",
    "workflowId": "3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36",
    "toolName": "triage_ticket",
    "toolDescription": "Execute Ticket triage workflow",
    "mcpServerUrl": "https://www.sim.ai/api/mcp/serve/wfmcp_01J8ZK3QW4M6X2R9T7B5C0V2",
    "apiEndpoint": "https://www.sim.ai/api/v2/workflows/3b1f7c92-8d4e-4a6b-9c0d-5e2f8a714b36/execute",
    "updated": false,
    "createdAt": "2026-06-12T10:30:00.000Z",
    "updatedAt": "2026-06-12T10:30:00.000Z"
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "Invalid request"
  }
}
{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "API key required"
  }
}
{
  "error": {
    "code": "FORBIDDEN",
    "message": "Insufficient workspace permissions",
    "details": {
      "code": "INSUFFICIENT_WORKSPACE_ROLE"
    }
  }
}
{
  "error": {
    "code": "NOT_FOUND",
    "message": "Not found"
  }
}
{
  "error": {
    "code": "CONFLICT",
    "message": "API key name already exists"
  }
}
{
  "error": {
    "code": "PAYLOAD_TOO_LARGE",
    "message": "Request body is too large"
  }
}
{
  "error": {
    "code": "UNSUPPORTED_MEDIA_TYPE",
    "message": "Request body must be sent as application/json"
  }
}
{
  "error": {
    "code": "RATE_LIMITED",
    "message": "API rate limit exceeded",
    "details": {
      "retryAfter": "2026-01-01T00:00:30.000Z"
    }
  }
}
{
  "error": {
    "code": "INTERNAL_ERROR",
    "message": "Internal server error"
  }
}
{
  "error": {
    "code": "SERVICE_UNAVAILABLE",
    "message": "Service temporarily unavailable"
  }
}