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#!/usr/bin/env node
import * as path from "node:path";
import * as fs from "node:fs";
import * as os from "node:os";
import { v4 as uuid } from "uuid";
import { spawn } from "node:child_process";
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import {
CallToolRequestSchema,
ErrorCode,
ListToolsRequestSchema,
McpError,
} from "@modelcontextprotocol/sdk/types.js";
let [rootDir, agentName] = process.argv.slice(2);
if (!rootDir) {
console.error("Usage: mcp-llm-functions <llm-functions-dir> [<agent-name>]");
process.exit(1);
}
rootDir = path.resolve(rootDir);
let functionsJsonPath = path.join(rootDir, "functions.json");
if (agentName) {
functionsJsonPath = path.join(rootDir, "agents", agentName, "functions.json");
}
let functions = [];
try {
const data = await fs.promises.readFile(functionsJsonPath, "utf8");
functions = JSON.parse(data);
} catch {
console.error(`Failed to read functions at '${functionsJsonPath}'`);
process.exit(1);
}
const env = Object.assign({}, process.env, {
PATH: `${path.join(rootDir, "bin")}:${process.env.PATH}`
});
const server = new Server(
{
name: `llm-functions/${agentName || "common-tools"}`,
version: "0.1.0",
},
{
capabilities: {
tools: {},
},
},
);
server.setRequestHandler(ListToolsRequestSchema, async () => {
return {
tools: functions.map((f) => ({
name: f.name,
description: f.description,
inputSchema: f.parameters,
})),
};
});
server.setRequestHandler(CallToolRequestSchema, async (request) => {
const functionObj = functions.find((f) => f.name === request.params.name);
if (!functionObj) {
throw new McpError(ErrorCode.InvalidRequest, `Unexpected tool '${request.params.name}'`);
}
let command = request.params.name;
let args = [JSON.stringify(request.params.arguments || {})];
if (agentName && functionObj.agent) {
args.unshift(command);
command = agentName;
}
const tmpFile = path.join(os.tmpdir(), `mcp-llm-functions-${process.pid}-eval-${uuid()}`);
const { exitCode, stderr } = await runCommand(command, args, { ...env, LLM_OUTPUT: tmpFile });
if (exitCode === 0) {
let output = '';
try {
output = await fs.promises.readFile(tmpFile, "utf8");
} catch { };
return {
content: [{ type: "text", value: output }],
}
} else {
return {
isError: true,
error: stderr,
};
}
});
function runCommand(command, args, env) {
return new Promise((resolve, reject) => {
const child = spawn(command, args, {
stdio: ['ignore', 'ignore', 'pipe'],
env,
});
let stderr = '';
child.stderr.on('data', (data) => {
stderr += data.toString();
});
child.on('close', (exitCode) => {
resolve({ exitCode, stderr });
});
child.on('error', (err) => {
reject(err);
});
});
}
async function runServer() {
const transport = new StdioServerTransport();
await server.connect(transport);
console.error("LLM-Functions MCP Server running on stdio");
}
runServer().catch(console.error);
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