feat: add dynamic tool loading system with Railway executor

Implements a complete dynamic tool loading system that allows the playground to discover and load tools from the TPMJS registry at runtime.

**Architecture:**
- Search tool package (@tpmjs/search-registry) - Searches registry for tools
- Search API endpoint (/api/tools/search) - Text-based search with scoring
- Pre-flight tool loading - Automatically searches and loads tools on every message
- Railway executor service (Deno) - Loads tools from esm.sh via HTTP imports
- Dynamic tool loader - Calls Railway to load and execute tools remotely

**Key Components:**

1. Railway Executor (apps/railway-executor/)
   - Deno-based service that natively supports HTTP imports
   - Endpoints: /load-and-describe, /execute-tool, /cache/stats, /cache/clear
   - Deploys to Railway with deno run --allow-net --allow-env server.ts

2. Search Tool Package (packages/tools/search-registry/)
   - AI SDK v6 tool for searching TPMJS registry
   - Uses jsonSchema + inputSchema pattern
   - Searches /api/tools/search endpoint

3. Search API (apps/web/src/app/api/tools/search/)
   - Text-based search with composite scoring
   - Scores: text relevance + quality boost + download boost
   - Returns tool metadata with importUrl for dynamic loading

4. Dynamic Tool Loader (apps/playground/src/lib/dynamic-tool-loader.ts)
   - Calls Railway service to load tools from esm.sh
   - Creates tool wrappers that execute remotely
   - Process-level module cache + per-conversation tracking

5. Pre-flight Loading (apps/playground/src/app/api/chat/route.ts)
   - Automatically searches for tools on every user message
   - Loads top 5 matching tools before agent processes request
   - Merges with static tools for seamless experience

**Technical Decisions:**
- Deno over Node.js: Native HTTP import support without flags
- Remote execution: Tools run in Railway sandbox, not Vercel
- Pre-flight loading: Better UX than two-turn search pattern
- Text search: BM25 had dependency issues, simple scoring works well

**Environment Variables:**
- RAILWAY_SERVICE_URL: https://endearing-commitment-production.up.railway.app

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Ajax Davis 2025-12-04 08:25:53 +10:00
parent 141a64d888
commit d597a71eb4
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# 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:**
```json
{
"packageName": "firecrawl-aisdk",
"exportName": "webSearchTool",
"version": "0.7.2",
"importUrl": "https://esm.sh/firecrawl-aisdk@0.7.2"
}
```
**Response:**
```json
{
"success": true,
"tool": {
"exportName": "webSearchTool",
"description": "Search the web using Firecrawl",
"inputSchema": { ... }
}
}
```
### `POST /execute-tool`
Execute a tool with parameters
**Request:**
```json
{
"packageName": "firecrawl-aisdk",
"exportName": "webSearchTool",
"version": "0.7.2",
"params": {
"query": "latest AI news"
}
}
```
**Response:**
```json
{
"success": true,
"output": { ... },
"executionTimeMs": 1234
}
```
### `POST /cache/clear`
Clear the module cache
### `GET /cache/stats`
Get cache statistics
## Local Development
```bash
# 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:
```bash
cd apps/railway-executor
railway init
```
2. Link to your Railway project:
```bash
railway link
```
3. Deploy:
```bash
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:
```bash
curl http://localhost:3001/health
```
### Test tool loading:
```bash
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:
```bash
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:
```bash
RAILWAY_SERVICE_URL=https://your-service.up.railway.app
```
Or use existing:
```bash
SANDBOX_EXECUTOR_URL=https://your-service.up.railway.app
```

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"license": "MIT",
"dependencies": {
"media-typer": "0.3.0",
"mime-types": "~2.1.24"
},
"engines": {
"node": ">= 0.6"
}
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"license": "MIT",
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"license": "MIT",
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"license": "MIT",
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@ -0,0 +1,15 @@
{
"name": "railway-executor",
"version": "1.0.0",
"description": "Dynamic tool executor for TPMJS with esm.sh imports",
"type": "module",
"main": "server.js",
"scripts": {
"start": "node server.js",
"dev": "node server.js"
},
"dependencies": {
"express": "^4.18.2",
"cors": "^2.8.5"
}
}

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{
"$schema": "https://railway.app/railway.schema.json",
"build": {
"builder": "NIXPACKS"
},
"deploy": {
"startCommand": "deno run --allow-net --allow-env server.ts",
"restartPolicyType": "ON_FAILURE",
"restartPolicyMaxRetries": 10
}
}

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/**
* Railway Dynamic Tool Executor
* Runs with --experimental-network-imports to support esm.sh imports
*/
import cors from 'cors';
import express from 'express';
const app = express();
const PORT = process.env.PORT || 3001;
// Middleware
app.use(cors());
app.use(express.json());
// Cache for imported tool modules
const moduleCache = new Map();
/**
* Health check endpoint
*/
app.get('/health', (req, res) => {
res.json({
status: 'ok',
timestamp: new Date().toISOString(),
cacheSize: moduleCache.size,
nodeVersion: process.version,
experimentalNetworkImports: true,
});
});
/**
* Load and describe a tool from esm.sh
* Returns tool metadata (description, schema) without executing
*/
app.post('/load-and-describe', async (req, res) => {
const { packageName, exportName, version, importUrl } = req.body;
if (!packageName || !exportName || !version) {
return res.status(400).json({
success: false,
error: 'Missing required fields: packageName, exportName, version',
});
}
const cacheKey = `${packageName}::${exportName}`;
try {
let toolModule;
// Check cache first
if (moduleCache.has(cacheKey)) {
console.log(`✅ Cache hit: ${cacheKey}`);
toolModule = moduleCache.get(cacheKey);
} else {
// Dynamic import from esm.sh using fetch + eval
// Note: import() doesn't support HTTPS URLs without custom loader in Node.js
const url = importUrl || `https://esm.sh/${packageName}@${version}`;
console.log(`📦 Importing: ${url}`);
const response = await fetch(url);
if (!response.ok) {
throw new Error(`Failed to fetch module: ${response.statusText}`);
}
const moduleCode = await response.text();
// Create a module wrapper that captures exports
const moduleExports = {};
const moduleWrapper = new Function('exports', 'module', 'require', moduleCode);
moduleWrapper(moduleExports, { exports: moduleExports }, require);
// esm.sh returns ES modules, try to get default or named export
const module = moduleExports.default || moduleExports;
toolModule = module[exportName] || module;
if (!toolModule) {
console.error(`❌ Export "${exportName}" not found. Available:`, Object.keys(module));
return res.status(404).json({
success: false,
error: `Export "${exportName}" not found in module`,
availableExports: Object.keys(module),
});
}
// Validate it's an AI SDK tool
if (!toolModule.description || !toolModule.execute) {
console.error(`❌ Invalid AI SDK tool structure:`, {
hasDescription: !!toolModule.description,
hasExecute: !!toolModule.execute,
hasInputSchema: !!toolModule.inputSchema,
keys: Object.keys(toolModule),
});
return res.status(400).json({
success: false,
error: 'Invalid AI SDK tool structure (missing description or execute)',
toolKeys: Object.keys(toolModule),
});
}
// Cache it
moduleCache.set(cacheKey, toolModule);
console.log(`✅ Cached: ${cacheKey}`);
}
// Extract tool definition (description + schema)
// AI SDK v6 tools have: description, inputSchema, execute
res.json({
success: true,
tool: {
exportName,
description: toolModule.description,
inputSchema: toolModule.inputSchema || toolModule.parameters?.shape || {},
},
});
} catch (error) {
console.error('❌ Failed to load tool:', error);
res.status(500).json({
success: false,
error: error.message,
stack: process.env.NODE_ENV === 'development' ? error.stack : undefined,
});
}
});
/**
* Execute a dynamically loaded tool with parameters
*/
app.post('/execute-tool', async (req, res) => {
const { packageName, exportName, version, importUrl, params } = req.body;
if (!packageName || !exportName || !version) {
return res.status(400).json({
success: false,
error: 'Missing required fields: packageName, exportName, version',
});
}
const cacheKey = `${packageName}::${exportName}`;
const startTime = Date.now();
try {
let toolModule;
// Check cache or import
if (moduleCache.has(cacheKey)) {
console.log(`✅ Using cached tool: ${cacheKey}`);
toolModule = moduleCache.get(cacheKey);
} else {
const url = importUrl || `https://esm.sh/${packageName}@${version}`;
console.log(`📦 Importing for execution: ${url}`);
const module = await import(url);
toolModule = module[exportName];
if (!toolModule || !toolModule.execute) {
return res.status(404).json({
success: false,
error: 'Tool not found or invalid',
executionTimeMs: Date.now() - startTime,
});
}
moduleCache.set(cacheKey, toolModule);
}
// Execute the tool
console.log(`🚀 Executing ${cacheKey} with params:`, params);
const result = await toolModule.execute(params || {});
const executionTimeMs = Date.now() - startTime;
console.log(`✅ Execution complete in ${executionTimeMs}ms`);
res.json({
success: true,
output: result,
executionTimeMs,
});
} catch (error) {
const executionTimeMs = Date.now() - startTime;
console.error('❌ Tool execution failed:', error);
res.status(500).json({
success: false,
error: error.message,
executionTimeMs,
stack: process.env.NODE_ENV === 'development' ? error.stack : undefined,
});
}
});
/**
* Clear module cache (for debugging)
*/
app.post('/cache/clear', (req, res) => {
const size = moduleCache.size;
moduleCache.clear();
console.log(`🗑️ Cleared cache (${size} entries)`);
res.json({
success: true,
message: `Cleared ${size} cached modules`,
});
});
/**
* Get cache statistics
*/
app.get('/cache/stats', (req, res) => {
const entries = Array.from(moduleCache.keys());
res.json({
success: true,
cacheSize: moduleCache.size,
cachedTools: entries,
});
});
// Start server
app.listen(PORT, () => {
console.log(`🚀 Railway Tool Executor running on port ${PORT}`);
console.log(`📦 Experimental network imports: ENABLED`);
console.log(`🔗 Health check: http://localhost:${PORT}/health`);
console.log(`🛠️ Endpoints:`);
console.log(` POST /load-and-describe - Load tool and get schema`);
console.log(` POST /execute-tool - Execute a tool with params`);
console.log(` POST /cache/clear - Clear module cache`);
console.log(` GET /cache/stats - Get cache statistics`);
});

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/**
* Railway Dynamic Tool Executor (Deno)
* Uses Deno's native HTTP import support
*/
// Cache for imported tool modules
const moduleCache = new Map<string, any>();
/**
* Load and describe a tool from esm.sh
*/
async function loadAndDescribe(req: Request): Promise<Response> {
try {
const body = await req.json();
const { packageName, exportName, version, importUrl } = body;
if (!packageName || !exportName || !version) {
return Response.json(
{
success: false,
error: 'Missing required fields: packageName, exportName, version',
},
{ status: 400 }
);
}
const cacheKey = `${packageName}::${exportName}`;
let toolModule;
// Check cache first
if (moduleCache.has(cacheKey)) {
console.log(`✅ Cache hit: ${cacheKey}`);
toolModule = moduleCache.get(cacheKey);
} else {
// Dynamic import from esm.sh (Deno supports this natively!)
const url = importUrl || `https://esm.sh/${packageName}@${version}`;
console.log(`📦 Importing: ${url}`);
const module = await import(url);
toolModule = module[exportName];
if (!toolModule) {
console.error(`❌ Export "${exportName}" not found. Available:`, Object.keys(module));
return Response.json(
{
success: false,
error: `Export "${exportName}" not found in module`,
availableExports: Object.keys(module),
},
{ status: 404 }
);
}
// Validate it's an AI SDK tool
if (!toolModule.description || !toolModule.execute) {
console.error(`❌ Invalid AI SDK tool structure:`, {
hasDescription: !!toolModule.description,
hasExecute: !!toolModule.execute,
hasInputSchema: !!toolModule.inputSchema,
keys: Object.keys(toolModule),
});
return Response.json(
{
success: false,
error: 'Invalid AI SDK tool structure (missing description or execute)',
toolKeys: Object.keys(toolModule),
},
{ status: 400 }
);
}
// Cache it
moduleCache.set(cacheKey, toolModule);
console.log(`✅ Cached: ${cacheKey}`);
}
// Extract tool definition
return Response.json({
success: true,
tool: {
exportName,
description: toolModule.description,
inputSchema: toolModule.inputSchema || toolModule.parameters?.shape || {},
},
});
} catch (error) {
console.error('❌ Failed to load tool:', error);
return Response.json(
{
success: false,
error: error.message,
},
{ status: 500 }
);
}
}
/**
* Execute a tool with parameters
*/
async function executeTool(req: Request): Promise<Response> {
try {
const body = await req.json();
const { packageName, exportName, version, importUrl, params } = body;
if (!packageName || !exportName || !version) {
return Response.json(
{
success: false,
error: 'Missing required fields: packageName, exportName, version',
},
{ status: 400 }
);
}
const cacheKey = `${packageName}::${exportName}`;
const startTime = Date.now();
let toolModule;
// Check cache or import
if (moduleCache.has(cacheKey)) {
console.log(`✅ Using cached tool: ${cacheKey}`);
toolModule = moduleCache.get(cacheKey);
} else {
const url = importUrl || `https://esm.sh/${packageName}@${version}`;
console.log(`📦 Importing for execution: ${url}`);
const module = await import(url);
toolModule = module[exportName];
if (!toolModule || !toolModule.execute) {
return Response.json(
{
success: false,
error: 'Tool not found or invalid',
executionTimeMs: Date.now() - startTime,
},
{ status: 404 }
);
}
moduleCache.set(cacheKey, toolModule);
}
// Execute the tool
console.log(`🚀 Executing ${cacheKey} with params:`, params);
const result = await toolModule.execute(params || {});
const executionTimeMs = Date.now() - startTime;
console.log(`✅ Execution complete in ${executionTimeMs}ms`);
return Response.json({
success: true,
output: result,
executionTimeMs,
});
} catch (error) {
const executionTimeMs = Date.now() - Date.now();
console.error('❌ Tool execution failed:', error);
return Response.json(
{
success: false,
error: error.message,
executionTimeMs,
},
{ status: 500 }
);
}
}
/**
* Health check
*/
function health(): Response {
return Response.json({
status: 'ok',
timestamp: new Date().toISOString(),
cacheSize: moduleCache.size,
denoVersion: Deno.version.deno,
v8Version: Deno.version.v8,
httpImports: true,
});
}
/**
* Cache stats
*/
function cacheStats(): Response {
const entries = Array.from(moduleCache.keys());
return Response.json({
success: true,
cacheSize: moduleCache.size,
cachedTools: entries,
});
}
/**
* Clear cache
*/
function clearCache(): Response {
const size = moduleCache.size;
moduleCache.clear();
console.log(`🗑️ Cleared cache (${size} entries)`);
return Response.json({
success: true,
message: `Cleared ${size} cached modules`,
});
}
/**
* Main request handler
*/
async function handler(req: Request): Promise<Response> {
const url = new URL(req.url);
// Add CORS headers
const headers = {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type',
};
if (req.method === 'OPTIONS') {
return new Response(null, { headers });
}
try {
let response: Response;
if (url.pathname === '/health' && req.method === 'GET') {
response = health();
} else if (url.pathname === '/load-and-describe' && req.method === 'POST') {
response = await loadAndDescribe(req);
} else if (url.pathname === '/execute-tool' && req.method === 'POST') {
response = await executeTool(req);
} else if (url.pathname === '/cache/stats' && req.method === 'GET') {
response = cacheStats();
} else if (url.pathname === '/cache/clear' && req.method === 'POST') {
response = clearCache();
} else {
response = Response.json({ error: 'Not found' }, { status: 404 });
}
// Add CORS headers to response
Object.entries(headers).forEach(([key, value]) => {
response.headers.set(key, value);
});
return response;
} catch (error) {
console.error('Request handler error:', error);
return Response.json(
{
success: false,
error: error.message,
},
{ status: 500, headers }
);
}
}
// Start server
const port = Number.parseInt(Deno.env.get('PORT') || '3002');
console.log(`🚀 Railway Tool Executor (Deno) running on port ${port}`);
console.log(`📦 HTTP imports: ENABLED`);
console.log(`🔗 Health check: http://localhost:${port}/health`);
console.log(`🛠️ Endpoints:`);
console.log(` POST /load-and-describe - Load tool and get schema`);
console.log(` POST /execute-tool - Execute a tool with params`);
console.log(` POST /cache/clear - Clear module cache`);
console.log(` GET /cache/stats - Get cache statistics`);
Deno.serve({ port }, handler);