Railway Dynamic Tool Executor

Dynamic tool executor service that runs with --experimental-network-imports to support loading npm packages from esm.sh at runtime.

Features

• 🔥 Dynamic imports from esm.sh
• 💾 Module caching for fast repeated loads
• 🛡️ Validation of AI SDK tool structure
• 🚀 Remote execution of tools with parameters

Endpoints

GET /health

Health check and cache statistics

POST /load-and-describe

Load a tool from esm.sh and return its schema

Request:

{
  "packageName": "firecrawl-aisdk",
  "exportName": "webSearchTool",
  "version": "0.7.2",
  "importUrl": "https://esm.sh/[email protected]"
}

Response:

{
  "success": true,
  "tool": {
    "exportName": "webSearchTool",
    "description": "Search the web using Firecrawl",
    "inputSchema": { ... }
  }
}

POST /execute-tool

Execute a tool with parameters

Request:

{
  "packageName": "firecrawl-aisdk",
  "exportName": "webSearchTool",
  "version": "0.7.2",
  "params": {
    "query": "latest AI news"
  }
}

Response:

{
  "success": true,
  "output": { ... },
  "executionTimeMs": 1234
}

POST /cache/clear

Clear the module cache

GET /cache/stats

Get cache statistics

Local Development

# Install dependencies
npm install

# Start server
npm start

# Server runs on http://localhost:3001

Railway Deployment

This service is designed to run on Railway.

Deploy Steps

1. Initialize Railway in this directory:

cd apps/railway-executor
railway init

2. Link to your Railway project:

railway link

3. Deploy:

railway up

4. Railway will automatically:
   • Detect Node.js
   • Run npm install
   • Execute npm start (which includes --experimental-network-imports)

Environment Variables

No environment variables required for basic operation. Optional:

• PORT - Server port (Railway sets this automatically)
• NODE_ENV - Set to production in Railway

Testing

Test health endpoint:

curl http://localhost:3001/health

Test tool loading:

curl -X POST http://localhost:3001/load-and-describe \
  -H "Content-Type: application/json" \
  -d '{
    "packageName": "@tpmjs/hello",
    "exportName": "helloWorldTool",
    "version": "0.1.0"
  }'

Test tool execution:

curl -X POST http://localhost:3001/execute-tool \
  -H "Content-Type: application/json" \
  -d '{
    "packageName": "@tpmjs/hello",
    "exportName": "helloWorldTool",
    "version": "0.1.0",
    "params": {}
  }'

Integration with Playground

The playground app calls this service to load and execute tools dynamically.

Set in playground environment:

RAILWAY_SERVICE_URL=https://your-service.up.railway.app

Or use existing:

SANDBOX_EXECUTOR_URL=https://your-service.up.railway.app