localhost-mcp
localhost-mcp
MCP-сервер для инспекции, управления и завершения локальных серверов разработки. Перестаньте гадать, что запущено на :3000.

Работает в паре с terminal-history-mcp — вместе они дают вашему ИИ-агенту полную память о вашей среде разработки: что вы запускали и что запущено сейчас.
Зачем
Каждый разработчик сталкивается с этим ежедневно:
Error: listen EADDRINUSE :::3000— что занимает порт?5 забытых PID
node/vite/nextс прошлой недели, потребляющих оперативную памятьПереключение между проектами → нет понимания, какие серверы разработки все еще запущены
lsof -i :3000,kill -9 <pid>, повторить
localhost-mcp позволяет сделать это одним вызовом инструмента.
Related MCP server: Git Insight MCP
Установка
npm install -g localhost-mcpПодключите к Claude Code:
claude mcp add --scope user localhost -- localhost-mcpИли к любому MCP-совместимому клиенту. Команда запускается как stdio MCP-сервер.
Инструменты
Инструмент | Назначение |
| Все активные серверы разработки с портом, pid, фреймворком, проектом, временем работы, памятью, CPU |
| Инспекция конкретного порта — кто его занимает |
| Завершение по pid или порту. По умолчанию — предварительный просмотр; передайте |
| Обнаружение долго работающих, простаивающих или ресурсоемких серверов разработки |
| Почему порт X занят + 5 свободных альтернатив рядом |
Пример вывода
{
"port": 3000,
"pid": 48211,
"process": "node",
"cmdline": "next dev",
"cwd": "/Users/me/code/myapp",
"project_name": "myapp",
"framework": "next.js",
"uptime_seconds": 14523,
"memory_mb": 412,
"cpu_pct": 0.3,
"user": "me"
}Безопасность
kill_serverпо умолчанию работает в режиме предварительного просмотра. Необходимо передатьconfirm=true.Отказ от завершения PID < 1000 (системные процессы).
Отказ от завершения процессов вне белого списка разработки (node, python, ruby, go, deno, bun, php, java, rails, vite, next и т.д.).
Сначала отправляется SIGTERM, через 5 секунд ожидания — SIGKILL.
Обнаружение фреймворков
next.js, vite, nuxt, remix, astro, webpack-dev-server, esbuild, create-react-app, express, fastify, koa, hono, rails, django, flask, fastapi, uvicorn, gunicorn, deno, bun, php-builtin, jekyll, hugo.
При использовании общей командной строки (node server.js) выполняется поиск по package.json.
Поддержка платформ
macOS — полная поддержка (использует
lsof)Linux — полная поддержка (использует
lsof+/proc)Windows — только базовое сканирование портов (использует
netstat); определение рабочей директории / фреймворка ограничено
Использование CLI
localhost-mcp list # JSON list of all dev servers
localhost-mcp zombies # JSON list of zombie candidates
localhost-mcp # Start MCP stdio serverСборка из исходного кода
git clone https://github.com/hasanjahidul/localhost-mcp.git
cd localhost-mcp
npm install
npm run build
node dist/cli.js listЛицензия
MIT
Available Tools
5 toolsfind_zombiesARead-onlyIdempotent
Read-only. Flags dev servers that look abandoned — all three of: uptime > 6h AND CPU < 1% AND memory > 100MB. By default it excludes known always-on noise (VS Code server, language servers, other MCP servers, postgres/redis, sidekiq, etc.); set include_excluded: true to also list those. Each candidate comes with the reasons it matched. This tool never kills anything — pass results to kill_server. Returns { count, candidates[] }.
Inputs: include_excluded. Returns: count, candidates
kill_serverADestructive
Terminates a local dev server by pid or port. DESTRUCTIVE. Safe by default: with no confirm, this is a DRY RUN — it reports what it would kill and changes nothing. Pass confirm: true to actually terminate: sends SIGTERM, waits up to 5s, then escalates to SIGKILL (or SIGKILL immediately if force: true). Refuses PIDs below 1000 and processes that don't look like dev servers. Provide exactly one of pid or port. Returns what was (or would be) killed and the signal used.
Inputs: pid, port, force, confirm. Returns: pid, port, killed, signal, +3 more
list_dev_serversARead-onlyIdempotent
Read-only. Lists every local development server (next, vite, nuxt, remix, astro, rails, django, flask, express, deno, bun, etc.) currently LISTENING on a TCP port. For each: port, pid, process name, command line, working directory, project name, detected framework, uptime, memory (MB), CPU %, and owning user. Uses lsof on macOS/Linux and netstat on Windows; on Windows the cwd/framework fields are limited. Takes no arguments. Returns { count, servers[] }.
Inputs: no named parameters. Returns: count, servers
port_conflictARead-onlyIdempotent
Read-only. Diagnoses an EADDRINUSE situation: given a port, returns the dev server currently blocking it plus 5 free alternative ports nearby. Use it when a listen EADDRINUSE error fires and you want both the culprit and a port to switch to.
Inputs: port (required). Returns: port, blocked_by, alternatives
port_infoARead-onlyIdempotent
Read-only. Inspects a single TCP port and reports the dev server holding it (same fields as list_dev_servers). If nothing is listening, or the listener is not a recognised dev process, returns { port, status: "free" }. Useful for answering "what's on :3000?" before starting or killing something.
Inputs: port (required). Returns: Either a dev-server record (see list_dev_servers) or `{ port, status: "free" }`.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
Loading tool schema changelog…
TDQS
Scored across 5 tools
Each tool has a clearly distinct purpose: listing servers, inspecting a single port, finding zombies, killing servers, and diagnosing port conflicts. There is no functional overlap.
Tool names use snake_case, and most follow a verb_noun pattern (find_zombies, kill_server, list_dev_servers). However, port_conflict and port_info are noun-first, which is a minor inconsistency.
With 5 tools, the set is well-scoped for managing local dev servers: query, inspect, cleanup, and conflict resolution. No tool feels superfluous or missing.
The tools cover listing, inspecting, zombie identification, killing, and conflict diagnosis. There is a minor gap in that bulk operations (e.g., kill all zombies) are not directly supported, but the intended workflow is clear.
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