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executable file
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#!/usr/bin/env -S pkgx +node@20 npx ts-node
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { CallToolResult } from "@modelcontextprotocol/sdk/types.js";
import { writeFile, unlink, mkdir } from "fs/promises";
import { execSync } from "child_process";
import { platform, tmpdir } from "os";
import { spawn } from "child_process";
import { join } from "path";
import { z } from "zod";
const tmp = join(tmpdir(), "pkgx-mcp");
const server = new McpServer({
name: "pkgx-mcp",
version: "0.1.0",
});
// Check if running as root
function checkNotRoot(): void {
if (process.getuid && process.getuid() === 0) {
console.error("lol u wot mate? running as root is not allowed.");
process.exit(1);
}
}
// Execute pkgx command in sandbox
async function runPkgxCommand(program: string, args: string[], cwd?: string): Promise<CallToolResult> {
let cmd = await get_pkgx();
args = [program, ...args];
let sandboxProfilePath = "";
if (platform() === "darwin") {
//TODO do the sandbox *after* pkgx so it can have zero writes anywhere
const home = process.env.HOME || process.env.USERPROFILE || "";
const SANDBOX_PROFILE = `
(version 1)
(allow default)
(deny file-write*)
(allow file-write*
(subpath "/var")
(subpath "/tmp")
(subpath "/private")
(subpath "/dev/null")
)
(deny file-read*
(subpath "${home}/.ssh")
(subpath "${home}/.aws")
)
`;
sandboxProfilePath = join(tmpdir(), `pkgx_sandbox_${process.pid}_${Math.random().toString(36).substring(2, 15)}.sb`);
await writeFile(sandboxProfilePath, SANDBOX_PROFILE);
args = ["-f", sandboxProfilePath, cmd, ...args];
cmd = "sandbox-exec";
}
try {
// we make our own home so tools like `npx` can cache things since we prohibit writes everywhere else
const HOME = tmp;
const OLD_HOME = process.env.HOME;
await mkdir(tmp, {recursive: true});
const [stdout, stderr] = await new Promise<[string, string]>((resolve, reject) => {
const proc = spawn(cmd, args, {
stdio: ["ignore", "pipe", "pipe"],
env: {...process.env, HOME, OLD_HOME},
cwd
});
let stdout = "";
proc.stdout.on("data", (data) => {
stdout += data.toString();
});
let stderr = "";
proc.stderr.on("data", (data) => {
stderr += data.toString();
});
proc.on("close", (code, signal) => {
if (code === 0) {
resolve([stdout, stderr]);
} else {
const title = signal ? `signal(${signal})` : `exit(${code})`;
reject(new Error(JSON.stringify({ code, signal, program, args, cwd, HOME, stderr, stdout, title })));
}
});
});
return {
content: [{ type: "text", text: JSON.stringify({ stdout, stderr }) }],
};
} catch (error: any) {
return {
isError: true,
content: [{
type: "text",
text: error.message,
}]
};
} finally {
try {
//TODO lets not block u numpty
if (sandboxProfilePath) await unlink(sandboxProfilePath);
} catch (e) {
//noop
}
}
}
// Parse command line with proper quote handling
function parseCommandLine(cmd: string): [string, string[]] {
const args: string[] = [];
let current = '';
let inQuote = false;
let quoteChar = '';
for (let i = 0; i < cmd.length; i++) {
const char = cmd[i];
if (char === '\\' && i + 1 < cmd.length) {
// Handle escaped characters
current += cmd[++i];
continue;
}
if ((char === '"' || char === "'") && !inQuote) {
// Start of quoted section
inQuote = true;
quoteChar = char;
continue;
}
if (char === quoteChar && inQuote) {
// End of quoted section
inQuote = false;
quoteChar = '';
continue;
}
if (char === ' ' && !inQuote) {
// Space outside quotes - split argument
if (current) {
args.push(current);
current = '';
}
continue;
}
current += char;
}
// Add the last argument if there is one
if (current) {
args.push(current);
}
if (args.length === 0) {
return ['', []];
}
return [args[0], args.slice(1)];
}
server.tool(
"run-command-line",
`
Run a command line with \`pkgx\`.
The command line can only contain a single program instantiation.
Programs cannot write to the file system.
HOME is set to a temporary directory you can write to.
OLD_HOME is the previous HOME.
Programs do not run in a terminal and thus do not have stdin capabilities.
Shell syntax like pipes \`|\` will not work.
If you need pipes, run the tool multiple times and pipe the output yourself.
`,
{
commandLine: z.string().describe(`
The program to run, pkgx provides almost all open source tools.
The program string can be versioned, eg. \`node@20\`.
Many tools are in npm or pypa—if so set the program to \`npx\` or \`uvx\` and put the tool you want in args!`),
workingDirectory: z.string().default(".").describe(`
Some tools work differently based on the directory they are run in.
Use this parameter accordingly.`)
},
async ({ commandLine, workingDirectory }) => {
checkNotRoot();
const [cmd, args] = parseCommandLine(commandLine);
return await runPkgxCommand(cmd, args, workingDirectory == "." ? undefined : workingDirectory);
}
);
server.tool(
"run-program-with-array-of-args",
`
Run a single program with \`pkgx\`.
Programs cannot write to the file system.
HOME is set to a temporary directory you can write to.
OLD_HOME is the previous HOME.
Programs do not run in a terminal and thus do not have stdin capabilities.
Shell syntax like pipes \`|\` will not work.
If you need pipes, run the tool multiple times and pipe the output yourself.
The \`args\` parameter must be an array of strings.
`,
{
program: z.string().describe(`
The program to run, pkgx provides almost all open source tools.
The program string can be versioned, eg. \`node@20\`.
Many tools are in npm or pypa—if so set the program to \`npx\` or \`uvx\` and put the tool you want in args!`),
args: z.array(z.string()).default([]).describe(`
Arguments to pass to the program.
The program is not run inside a shell, so do not use shell syntax like pipes.
Shell quoting rules should also be ignored, any quotes will be passed directly to the program.
`),
workingDirectory: z.string().default(".").describe(`
Some tools work differently based on the directory they are run in.
Use this parameter accordingly.`)
},
async ({ program, args, workingDirectory }) => {
checkNotRoot();
return await runPkgxCommand(program, args, workingDirectory == "." ? undefined : workingDirectory);
}
);
server.resource(
"list-runnable-programs",
"pkgx://programs/list",
async (uri) => {
const result = execSync("pkgx -Q", { stdio: ["inherit", "pipe", "inherit"] });
return {
contents: [{
uri: uri.href,
text: result.toString(),
}]
}
}
)
server.resource(
"list-mash-scripts",
"pkgx://mash/list",
async (uri) => {
const rsp = await fetch("https://pkgxdev.github.io/mash/index.json");
const text = await rsp.text();
return {
contents: [{
uri: uri.href,
text,
}]
}
}
)
const transport = new StdioServerTransport();
server.connect(transport).catch((err) => {
console.error(`Server failed: ${err}`);
process.exit(1);
});
async function get_pkgx() {
try {
execSync("pkgx --version")
throw new Error();
return "pkgx";
} catch {
const platform = (() => {
switch (`${process.platform}/${process.arch}`) {
case "linux/x64":
return "Linux/x86-64"
case "linux/arm64":
return "Linux/arm64"
case "darwin/arm64":
return "Darwin/arm64"
case "darwin/x64":
return "Darwin/x86-64"
default:
throw new Error(`Unsupported platform: ${process.platform}/${process.arch}`);
}
})()
await mkdir(tmp, {recursive: true});
const url = `https://pkgx.sh/${platform}`;
const filePath = join(tmp, "pkgx");
const response = await fetch(url);
if (!response.ok) {
throw new Error(`Failed to download pkgx: ${response.statusText}`);
}
const fileBuffer = await response.arrayBuffer();
await writeFile(filePath, Buffer.from(fileBuffer), { mode: 0o755 });
return filePath;
}
}