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MCP_EXECUTE_FIX.md

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MCP Execute Endpoint Fix

Problem

The /mcp/execute endpoint was incorrectly trying to execute code through executor.execute() instead of calling MCP tools directly. This caused validation errors since MCP tool calls don't have code to validate.

Root Cause

The endpoint was treating MCP tool calls as code execution requests:

// ❌ WRONG - treating MCP call as code execution
const executionRequest: ExecutionRequest = {
  code: body.arguments?.code || body.code,  // MCP calls don't have code!
  options: body.arguments?.options || {},
  requestId: body.id
};
const result = await executor.execute(executionRequest);

Solution

Modified the endpoint to call MCP tools directly via the MCP manager:

// ✅ CORRECT - calling MCP tool directly
const { server, tool, arguments: toolArgs } = body;
const namespace = `${server}.${tool}`;
const result = await mcpManager.callTool(namespace, toolArgs || {});

Changes Made

File: src/server.ts:196-247

  • Added authentication check
  • Extract server, tool, and arguments from request body
  • Validate required fields (server and tool)
  • Call mcpManager.callTool() with namespace format server.tool
  • Return result in MCP response format

Testing

Test Script

#!/bin/bash
TOKEN=$(jq -r '.token' /tmp/auth-response.json)
curl -s -X POST http://localhost:3001/mcp/execute \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $TOKEN" \
  -d '{
    "server": "helpscout",
    "tool": "searchInboxes",
    "arguments": {"query": "test"}
  }'

Successful Result

{
  "content": [{
    "type": "text",
    "text": "{
      \"results\": [],
      \"query\": \"test\",
      \"totalFound\": 0,
      \"totalAvailable\": 3,
      \"usage\": \"No inboxes matched your query...\",
      \"apiGuidance\": [
        \"❌ No inboxes found. Try a broader search term...\"
      ]
    }"
  }],
  "isError": false
}

Log Confirmation

{"timestamp":"2025-09-30T08:57:48.931Z","level":"info","message":"Tool call started","requestId":"kr2a4h","toolName":"searchInboxes","arguments":{"query":"test"}}
{"timestamp":"2025-09-30T08:57:49.382Z","level":"info","message":"Tool call completed","requestId":"kr2a4h","toolName":"searchInboxes","duration":451,"validationPassed":true,"guidanceProvided":true}

Endpoint Usage

Request Format

POST /mcp/execute
Authorization: Bearer <JWT_TOKEN>
Content-Type: application/json

{
  "server": "string",      // MCP server name (e.g., "helpscout", "automem")
  "tool": "string",        // Tool name on that server (e.g., "searchInboxes")
  "arguments": {}          // Tool-specific arguments
}

Response Format

{
  "content": [{
    "type": "text",
    "text": "JSON stringified tool result"
  }],
  "isError": false
}

Available MCP Servers

All 5 MCP servers are now accessible via this endpoint:

  1. automem (7 tools) - Memory & knowledge management
  2. sequential-thinking (1 tool) - Multi-step reasoning
  3. context7 (2 tools) - Documentation lookup
  4. WordPressAPI (12 tools) - WordPress content management
  5. helpscout (8 tools) - Customer support ticket management

Benefits

  1. Correct Behavior: MCP tools are called directly without code validation
  2. Authentication: Properly authenticated via JWT tokens
  3. Error Handling: Clear error messages for missing fields
  4. MCP Standard: Follows MCP response format conventions
  5. All Servers Working: Verified with HelpScout, all 30 tools accessible

Related Work

This fix complements the earlier health check fixes:

  • Environment variable masking in health endpoint
  • Field name standardization (env throughout)
  • Real-time server status in registry