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"devDependencies": { + "@types/node": "^20.19.25", + "typescript": "^5.9.3" + } +} diff --git a/mcp/shell/src/index.ts b/mcp/shell/src/index.ts new file mode 100644 index 00000000..39405ac0 --- /dev/null +++ b/mcp/shell/src/index.ts @@ -0,0 +1,114 @@ +import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; +import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js'; +import { z } from 'zod'; +import { spawn } from 'child_process'; + +const server = new McpServer({ + name: 'mcp-shell', + version: '0.1.0', +}); + +server.registerTool( + 'run-command', + { + title: 'Run Shell Command', + description: 'Runs a shell command using bash. The command is executed via `bash -c`. Arguments can be passed to the script.', + inputSchema: { + command: z.string().describe('The shell command or script to execute.'), + args: z.array(z.string()).optional().describe('Arguments to pass to the shell script (accessible as $1, $2, etc.).'), + env: z.record(z.string()).optional().describe('Environment variables to set.'), + timeout: z.number().default(300).describe('Timeout in seconds. Default is 300.'), + stdin: z.string().optional().describe('Content to pass to standard input.'), + }, + outputSchema: { + stdout: z.string(), + stderr: z.string(), + code: z.number().nullable(), + timedOut: z.boolean(), + }, + }, + async ({ command, args = [], env = {}, timeout = 300, stdin }) => { + return new Promise((resolve) => { + const controller = new AbortController(); + const { signal } = controller; + + const timer = setTimeout(() => { + controller.abort(); + }, timeout * 1000); + + const childEnv = { ...process.env, ...env }; + + const child = spawn('bash', ['-c', command, 'bash', ...args], { + env: childEnv, + signal, + }); + + let stdout = ''; + let stderr = ''; + + if (child.stdout) { + child.stdout.on('data', (data) => { + stdout += data.toString(); + }); + } + + if (child.stderr) { + child.stderr.on('data', (data) => { + stderr += data.toString(); + }); + } + + if (child.stdin) { + child.stdin.on('error', () => { + // Ignore stdin errors (e.g. EPIPE if the process exits early) + }); + if (stdin) { + child.stdin.write(stdin); + } + child.stdin.end(); + } + + let timedOut = false; + let errorOccurred = false; + + child.on('error', (err: any) => { + if (err.name === 'AbortError') { + timedOut = true; + } else { + errorOccurred = true; + clearTimeout(timer); + const result = { + stdout, + stderr: stderr + (stderr ? '\n' : '') + `Error spawning process: ${err.message}`, + code: -1, + timedOut: false, + }; + resolve({ + content: [{ type: 'text', text: JSON.stringify(result) }], + structuredContent: result, + }); + } + }); + + child.on('close', (code) => { + if (errorOccurred) return; + clearTimeout(timer); + + const result = { + stdout, + stderr, + code: timedOut ? null : code, + timedOut, + }; + + resolve({ + content: [{ type: 'text', text: JSON.stringify(result) }], + structuredContent: result, + }); + }); + }); + } +); + +const transport = new StdioServerTransport(); +await server.connect(transport); diff --git a/mcp/shell/tsconfig.json b/mcp/shell/tsconfig.json new file mode 100644 index 00000000..8c65f9b9 --- /dev/null +++ b/mcp/shell/tsconfig.json @@ -0,0 +1,13 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "outDir": "./dist", + "rootDir": "./src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true + }, + "include": ["src/**/*"] +} From 0bed8c2be26aefbecd7efc09d3f5f54bcd358c9f Mon Sep 17 00:00:00 2001 From: "google-labs-jules[bot]" <161369871+google-labs-jules[bot]@users.noreply.github.com> Date: Sun, 23 Nov 2025 21:49:13 +0000 Subject: [PATCH 2/3] feat: Add mcp/shell server --- mcp/shell/README.md | 35 +++++++++++++ mcp/shell/src/index.ts | 108 +++++++++++++++++++++++++++-------------- 2 files changed, 107 insertions(+), 36 deletions(-) create mode 100644 mcp/shell/README.md diff --git a/mcp/shell/README.md b/mcp/shell/README.md new file mode 100644 index 00000000..bf4a37f5 --- /dev/null +++ b/mcp/shell/README.md @@ -0,0 +1,35 @@ +# MCP Shell Server + +A Model Context Protocol (MCP) server that enables executing shell commands via +`bash`. + +## Tools + +### `run-command` + +Executes a shell command or script. + +**Inputs:** + +- `command` (string, required): The shell command or script to execute. +- `args` (array of strings, optional): Arguments passed to the script + (accessible as `$1`, `$2`, etc.). +- `env` (object, optional): Environment variables to set. +- `timeout` (number, optional): Timeout in seconds (default: 300). +- `stdin` (string, optional): Content to pass to standard input. + +**Outputs:** + +- `stdout` (string): Standard output. +- `stderr` (string): Standard error. +- `exitCode` (number): Exit code. + - `0`: Success. + - `1-123`: Command failure. + - `124`: Timeout. + - `128+N`: Terminated by signal N (e.g., 143 for SIGTERM). +- `timedOut` (boolean): True if the process was terminated due to timeout. + +## Usage + +This server is intended to be used by MCP clients to enable agents to run shell +commands. diff --git a/mcp/shell/src/index.ts b/mcp/shell/src/index.ts index 39405ac0..b99e1e35 100644 --- a/mcp/shell/src/index.ts +++ b/mcp/shell/src/index.ts @@ -1,31 +1,53 @@ -import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; -import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js'; -import { z } from 'zod'; -import { spawn } from 'child_process'; +import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; +import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; +import { z } from "zod"; +import { spawn } from "child_process"; +import { constants } from "os"; const server = new McpServer({ - name: 'mcp-shell', - version: '0.1.0', + name: "mcp-shell", + version: "0.1.0" }); server.registerTool( - 'run-command', + "run-command", { - title: 'Run Shell Command', - description: 'Runs a shell command using bash. The command is executed via `bash -c`. Arguments can be passed to the script.', + title: "Run Shell Command", + description: + "Runs a shell command using bash. The command is executed via `bash -c`. Arguments can be passed to the script.", inputSchema: { - command: z.string().describe('The shell command or script to execute.'), - args: z.array(z.string()).optional().describe('Arguments to pass to the shell script (accessible as $1, $2, etc.).'), - env: z.record(z.string()).optional().describe('Environment variables to set.'), - timeout: z.number().default(300).describe('Timeout in seconds. Default is 300.'), - stdin: z.string().optional().describe('Content to pass to standard input.'), + command: z.string().describe("The shell command or script to execute."), + args: z + .array(z.string()) + .optional() + .describe( + "Arguments to pass to the shell script (accessible as $1, $2, etc.)." + ), + env: z + .record(z.string()) + .optional() + .describe("Environment variables to set."), + timeout: z + .number() + .default(300) + .describe("Timeout in seconds. Default is 300."), + stdin: z + .string() + .optional() + .describe("Content to pass to standard input.") }, outputSchema: { stdout: z.string(), stderr: z.string(), - code: z.number().nullable(), - timedOut: z.boolean(), - }, + exitCode: z + .number() + .describe( + "The exit code of the process. 124 indicates a timeout. 128+N indicates termination by signal N." + ), + timedOut: z + .boolean() + .describe("Whether the process was terminated due to a timeout.") + } }, async ({ command, args = [], env = {}, timeout = 300, stdin }) => { return new Promise((resolve) => { @@ -38,28 +60,28 @@ server.registerTool( const childEnv = { ...process.env, ...env }; - const child = spawn('bash', ['-c', command, 'bash', ...args], { + const child = spawn("bash", ["-c", command, "bash", ...args], { env: childEnv, - signal, + signal }); - let stdout = ''; - let stderr = ''; + let stdout = ""; + let stderr = ""; if (child.stdout) { - child.stdout.on('data', (data) => { + child.stdout.on("data", (data) => { stdout += data.toString(); }); } if (child.stderr) { - child.stderr.on('data', (data) => { + child.stderr.on("data", (data) => { stderr += data.toString(); }); } if (child.stdin) { - child.stdin.on('error', () => { + child.stdin.on("error", () => { // Ignore stdin errors (e.g. EPIPE if the process exits early) }); if (stdin) { @@ -71,39 +93,53 @@ server.registerTool( let timedOut = false; let errorOccurred = false; - child.on('error', (err: any) => { - if (err.name === 'AbortError') { + child.on("error", (err: any) => { + if (err.name === "AbortError") { timedOut = true; } else { errorOccurred = true; clearTimeout(timer); const result = { stdout, - stderr: stderr + (stderr ? '\n' : '') + `Error spawning process: ${err.message}`, - code: -1, - timedOut: false, + stderr: + stderr + + (stderr ? "\n" : "") + + `Error spawning process: ${err.message}`, + exitCode: 1, // Generic error + timedOut: false }; resolve({ - content: [{ type: 'text', text: JSON.stringify(result) }], - structuredContent: result, + content: [{ type: "text", text: JSON.stringify(result) }], + structuredContent: result }); } }); - child.on('close', (code) => { + child.on("close", (code, signal) => { if (errorOccurred) return; clearTimeout(timer); + let finalCode = 0; + + if (timedOut) { + finalCode = 124; + } else if (code !== null) { + finalCode = code; + } else if (signal !== null) { + const signalNumber = (constants.signals as any)[signal] || 0; + finalCode = 128 + signalNumber; + } + const result = { stdout, stderr, - code: timedOut ? null : code, - timedOut, + exitCode: finalCode, + timedOut }; resolve({ - content: [{ type: 'text', text: JSON.stringify(result) }], - structuredContent: result, + content: [{ type: "text", text: JSON.stringify(result) }], + structuredContent: result }); }); }); From 9ed5d7c56df87e63ca3dadc03fc16935204e7ecb Mon Sep 17 00:00:00 2001 From: "google-labs-jules[bot]" <161369871+google-labs-jules[bot]@users.noreply.github.com> Date: Mon, 24 Nov 2025 10:38:06 +0000 Subject: [PATCH 3/3] feat: Improve mcp/shell server robustness and features --- mcp/shell/.gitignore | 2 + mcp/shell/README.md | 100 ++++++++++++++++++++++--- mcp/shell/package-lock.json | 9 ++- mcp/shell/package.json | 8 +- mcp/shell/src/index.ts | 141 +++++++++++++++++++++++++----------- mcp/shell/tsconfig.json | 4 +- 6 files changed, 205 insertions(+), 59 deletions(-) diff --git a/mcp/shell/.gitignore b/mcp/shell/.gitignore index b9470778..dd6e803c 100644 --- a/mcp/shell/.gitignore +++ b/mcp/shell/.gitignore @@ -1,2 +1,4 @@ node_modules/ dist/ +*.log +.DS_Store diff --git a/mcp/shell/README.md b/mcp/shell/README.md index bf4a37f5..ca22826c 100644 --- a/mcp/shell/README.md +++ b/mcp/shell/README.md @@ -1,7 +1,19 @@ # MCP Shell Server A Model Context Protocol (MCP) server that enables executing shell commands via -`bash`. +`bash`. Designed to be robust, secure, and easy to use for agents. + +## Features + +- **Execute Shell Commands**: Runs commands via `bash -c`. +- **Arguments**: Pass arguments safely to the script (accessible as `$1`, `$2`, + etc.). +- **Environment Variables**: Set custom environment variables. +- **Input (stdin)**: Pipe content to the command's standard input. +- **Working Directory**: Specify the directory to execute the command in. +- **Timeout**: Configurable timeout (default 300s) with process group killing. +- **Standard Exit Codes**: Returns 124 for timeout, 128+N for signals. +- **Output Guard**: Caps output size to 1MB to prevent memory issues. ## Tools @@ -9,27 +21,91 @@ A Model Context Protocol (MCP) server that enables executing shell commands via Executes a shell command or script. -**Inputs:** +#### Parameters - `command` (string, required): The shell command or script to execute. -- `args` (array of strings, optional): Arguments passed to the script - (accessible as `$1`, `$2`, etc.). +- `args` (array of strings, optional): Arguments passed to the script. - `env` (object, optional): Environment variables to set. +- `cwd` (string, optional): The directory to run the command in. - `timeout` (number, optional): Timeout in seconds (default: 300). - `stdin` (string, optional): Content to pass to standard input. -**Outputs:** +#### Output -- `stdout` (string): Standard output. -- `stderr` (string): Standard error. -- `exitCode` (number): Exit code. +- `stdout` (string): Standard output (truncated at 1MB). +- `stderr` (string): Standard error (truncated at 1MB). +- `exitCode` (number): The exit code. - `0`: Success. - `1-123`: Command failure. - `124`: Timeout. - - `128+N`: Terminated by signal N (e.g., 143 for SIGTERM). + - `128+N`: Terminated by signal N (e.g. 143 for SIGTERM). - `timedOut` (boolean): True if the process was terminated due to timeout. -## Usage +## Examples + +### Simple Command + +```json +{ + "name": "run-command", + "arguments": { + "command": "ls -la" + } +} +``` + +### With Arguments + +```json +{ + "name": "run-command", + "arguments": { + "command": "echo Hello $1", + "args": ["World"] + } +} +``` + +### With Environment Variables + +```json +{ + "name": "run-command", + "arguments": { + "command": "echo $MY_VAR", + "env": { "MY_VAR": "secret" } + } +} +``` + +### With Stdin + +```json +{ + "name": "run-command", + "arguments": { + "command": "grep foo", + "stdin": "bar\nfoo\nbaz" + } +} +``` + +### With Timeout + +```json +{ + "name": "run-command", + "arguments": { + "command": "sleep 10", + "timeout": 2 + } +} +``` + +## Testing + +You can test this server using the +[MCP Inspector](https://github.com/modelcontextprotocol/inspector). -This server is intended to be used by MCP clients to enable agents to run shell -commands. +1. Build the server: `npm install && npm run build` +2. Run with inspector: `npx @modelcontextprotocol/inspector node dist/index.js` diff --git a/mcp/shell/package-lock.json b/mcp/shell/package-lock.json index 78eabfb4..96ed7edb 100644 --- a/mcp/shell/package-lock.json +++ b/mcp/shell/package-lock.json @@ -1,15 +1,18 @@ { "name": "mcp-shell", - "version": "0.1.0", + "version": "1.0.0", "lockfileVersion": 3, "requires": true, "packages": { "": { "name": "mcp-shell", - "version": "0.1.0", + "version": "1.0.0", "dependencies": { "@modelcontextprotocol/sdk": "^1.22.0", - "zod": "^3.25.76" + "zod": "^3.24.0" + }, + "bin": { + "mcp-shell": "dist/index.js" }, "devDependencies": { "@types/node": "^20.19.25", diff --git a/mcp/shell/package.json b/mcp/shell/package.json index b018979d..dea81d9e 100644 --- a/mcp/shell/package.json +++ b/mcp/shell/package.json @@ -1,15 +1,19 @@ { "name": "mcp-shell", - "version": "0.1.0", + "version": "1.0.0", "type": "module", + "bin": { + "mcp-shell": "./dist/index.js" + }, "main": "dist/index.js", "scripts": { "build": "tsc", + "prepare": "npm run build", "start": "node dist/index.js" }, "dependencies": { "@modelcontextprotocol/sdk": "^1.22.0", - "zod": "^3.25.76" + "zod": "^3.24.0" }, "devDependencies": { "@types/node": "^20.19.25", diff --git a/mcp/shell/src/index.ts b/mcp/shell/src/index.ts index b99e1e35..d1c73090 100644 --- a/mcp/shell/src/index.ts +++ b/mcp/shell/src/index.ts @@ -1,12 +1,16 @@ +#!/usr/bin/env node import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; import { z } from "zod"; import { spawn } from "child_process"; import { constants } from "os"; +import { stat } from "fs/promises"; + +const MAX_OUTPUT_SIZE = 1024 * 1024; // 1MB cap const server = new McpServer({ name: "mcp-shell", - version: "0.1.0" + version: "1.0.0" }); server.registerTool( @@ -34,7 +38,11 @@ server.registerTool( stdin: z .string() .optional() - .describe("Content to pass to standard input.") + .describe("Content to pass to standard input."), + cwd: z + .string() + .optional() + .describe("The working directory for execution.") }, outputSchema: { stdout: z.string(), @@ -49,40 +57,94 @@ server.registerTool( .describe("Whether the process was terminated due to a timeout.") } }, - async ({ command, args = [], env = {}, timeout = 300, stdin }) => { - return new Promise((resolve) => { - const controller = new AbortController(); - const { signal } = controller; - - const timer = setTimeout(() => { - controller.abort(); - }, timeout * 1000); + async ({ command, args = [], env = {}, timeout = 300, stdin, cwd }) => { + // Validate cwd if provided + if (cwd) { + try { + const stats = await stat(cwd); + if (!stats.isDirectory()) { + return { + content: [ + { type: "text", text: `Error: cwd '${cwd}' is not a directory` } + ], + isError: true + }; + } + } catch (error: any) { + return { + content: [ + { + type: "text", + text: `Error resolving cwd '${cwd}': ${error.message}` + } + ], + isError: true + }; + } + } - const childEnv = { ...process.env, ...env }; + return new Promise((resolve) => { + let timedOut = false; + let killedByTimeout = false; + // Use detached: true to create a new process group, allowing us to kill the whole tree const child = spawn("bash", ["-c", command, "bash", ...args], { - env: childEnv, - signal + env: { ...process.env, ...env }, + cwd, + detached: true }); + const killProcess = () => { + if (child.pid) { + try { + // Kill the process group + process.kill(-child.pid, "SIGTERM"); + } catch (e) { + // Process might be already gone, try simple kill as fallback + try { + child.kill("SIGTERM"); + } catch (e2) {} + } + } + }; + + const timer = setTimeout(() => { + timedOut = true; + killedByTimeout = true; + killProcess(); + }, timeout * 1000); + let stdout = ""; let stderr = ""; + const appendOutput = (target: string, data: string): string => { + if (target.length >= MAX_OUTPUT_SIZE) return target; + const newLength = target.length + data.length; + if (newLength > MAX_OUTPUT_SIZE) { + return ( + target + + data.slice(0, MAX_OUTPUT_SIZE - target.length) + + "\n... [Truncated]" + ); + } + return target + data; + }; + if (child.stdout) { child.stdout.on("data", (data) => { - stdout += data.toString(); + stdout = appendOutput(stdout, data.toString()); }); } if (child.stderr) { child.stderr.on("data", (data) => { - stderr += data.toString(); + stderr = appendOutput(stderr, data.toString()); }); } if (child.stdin) { child.stdin.on("error", () => { - // Ignore stdin errors (e.g. EPIPE if the process exits early) + // Ignore EPIPE }); if (stdin) { child.stdin.write(stdin); @@ -90,29 +152,26 @@ server.registerTool( child.stdin.end(); } - let timedOut = false; let errorOccurred = false; child.on("error", (err: any) => { - if (err.name === "AbortError") { - timedOut = true; - } else { - errorOccurred = true; - clearTimeout(timer); - const result = { - stdout, - stderr: - stderr + - (stderr ? "\n" : "") + - `Error spawning process: ${err.message}`, - exitCode: 1, // Generic error - timedOut: false - }; - resolve({ - content: [{ type: "text", text: JSON.stringify(result) }], - structuredContent: result - }); - } + errorOccurred = true; + clearTimeout(timer); + const output = { + stdout, + stderr: + stderr + + (stderr ? "\n" : "") + + `Error spawning process: ${err.message}`, + exitCode: 1, + timedOut: false + }; + + resolve({ + content: [{ type: "text", text: JSON.stringify(output) }], + structuredContent: output, + isError: true + }); }); child.on("close", (code, signal) => { @@ -121,7 +180,7 @@ server.registerTool( let finalCode = 0; - if (timedOut) { + if (killedByTimeout) { finalCode = 124; } else if (code !== null) { finalCode = code; @@ -130,16 +189,16 @@ server.registerTool( finalCode = 128 + signalNumber; } - const result = { + const output = { stdout, stderr, exitCode: finalCode, - timedOut + timedOut: killedByTimeout }; resolve({ - content: [{ type: "text", text: JSON.stringify(result) }], - structuredContent: result + content: [{ type: "text", text: JSON.stringify(output) }], + structuredContent: output }); }); }); diff --git a/mcp/shell/tsconfig.json b/mcp/shell/tsconfig.json index 8c65f9b9..6d73ad94 100644 --- a/mcp/shell/tsconfig.json +++ b/mcp/shell/tsconfig.json @@ -7,7 +7,9 @@ "rootDir": "./src", "strict": true, "esModuleInterop": true, - "skipLibCheck": true + "skipLibCheck": true, + "declaration": true, + "forceConsistentCasingInFileNames": true }, "include": ["src/**/*"] }