mcptools MCP — 사용 사례, 설치 & 라이브 데모

Name: mcptools MCP Server
Author: f

왜 쓰나요

핵심 기능

Single binary, works with stdio/HTTP/SSE transports
mock creates fake MCP servers for testing clients
proxy wraps any shell command as an MCP tool
guard enforces allow/deny policies between client and server

라이브 데모

실제 사용 모습

mcptools.replay ▶ 준비됨

0/0

설치

클라이언트 선택

~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "mcptools": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/f/mcptools"
      ],
      "_inferred": true
    }
  }
}

Claude Desktop → Settings → Developer → Edit Config 열기. 저장 후 앱 재시작.

~/.cursor/mcp.json · .cursor/mcp.json

{
  "mcpServers": {
    "mcptools": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/f/mcptools"
      ],
      "_inferred": true
    }
  }
}

Cursor는 Claude Desktop과 동일한 mcpServers 스키마 사용. 프로젝트 설정이 전역보다 우선.

VS Code → Cline → MCP Servers → Edit

{
  "mcpServers": {
    "mcptools": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/f/mcptools"
      ],
      "_inferred": true
    }
  }
}

Cline 사이드바의 MCP Servers 아이콘 클릭 후 "Edit Configuration" 선택.

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "mcptools": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/f/mcptools"
      ],
      "_inferred": true
    }
  }
}

Claude Desktop과 같은 형식. Windsurf 재시작 후 적용.

~/.continue/config.json

{
  "mcpServers": [
    {
      "name": "mcptools",
      "command": "TODO",
      "args": [
        "See README: https://github.com/f/mcptools"
      ]
    }
  ]
}

Continue는 맵이 아닌 서버 오브젝트 배열 사용.

~/.config/zed/settings.json

{
  "context_servers": {
    "mcptools": {
      "command": {
        "path": "TODO",
        "args": [
          "See README: https://github.com/f/mcptools"
        ]
      }
    }
  }
}

context_servers에 추가. 저장 시 Zed가 핫 리로드.

claude mcp add mcptools -- TODO 'See README: https://github.com/f/mcptools'

한 줄 명령. claude mcp list로 확인, claude mcp remove로 제거.

사용 사례

실전 활용법: mcptools

How to debug an MCP server with mcptools

👤 MCP server authors ⏱ ~15 min intermediate

언제 쓸까: Your MCP works in Claude Desktop sometimes but fails silently — you need to see the raw wire traffic.

사전 조건

mcptools installed — brew install f/mcptools/mcp or go install github.com/f/mcptools/cmd/mcp@latest

흐름

List tools on your server

Run mcp tools --transport stdio -- node ./my-server.js. Check tool names and schemas.✓ 복사됨

→ Clean list; if empty, the server didn't advertise tools correctly
Call a specific tool with raw args

Run mcp call my_tool --params '{"x":1}' -- node ./my-server.js and inspect the JSON response.✓ 복사됨

→ Tool output matches expected schema
Start an interactive shell

Run mcp shell -- node ./my-server.js and call tools manually.✓ 복사됨

→ REPL with tab-complete over your tools

결과: You see exactly what Claude sees — bugs that only reproduce in Claude become visible here.

함정

Server logs to stdout, corrupting the JSON-RPC stream — Route all logs to stderr. mcptools surfaces this — the hint is garbled JSON parse errors
Tool schema uses unsupported JSON Schema keywords — Stick to core draft-07; some clients reject $ref, allOf, etc.

Mock an MCP server to test an MCP client

👤 Client authors ⏱ ~20 min intermediate

언제 쓸까: Your CI shouldn't depend on a real Sentry/GitHub server — you need a deterministic mock.

흐름

Write a mock spec

Create ./mock.yaml listing the tools you want to fake with canned responses.✓ 복사됨

→ YAML describing tool names + output templates
Run mcp mock

Run mcp mock --config ./mock.yaml --transport stdio and point your client at it.✓ 복사됨

→ Client sees a fully populated tool list; calls return canned data

결과: Hermetic tests that pass on airgapped CI.

Expose a shell command as an MCP tool without writing a server

👤 Ops, DIY hackers ⏱ ~10 min beginner

언제 쓸까: You have a handy shell script and want Claude to call it — but writing a full MCP server feels overkill.

흐름

Wrap the script

Run mcp proxy register disk_usage --command 'df -h' and confirm it's advertised.✓ 복사됨

→ Tool disk_usage registered
Point Claude at mcp proxy

Configure Claude's mcpServers with mcp proxy serve.✓ 복사됨

→ Claude can call disk_usage and gets the df output

결과: Zero-code MCP tools for quick automations.

함정

Exposing unrestricted shell is a foot-gun — Use mcp guard to whitelist specific commands; never expose bash -c

Enforce allow/deny policies on an upstream MCP with mcptools guard

👤 Security-minded teams using third-party MCPs ⏱ ~20 min advanced

언제 쓸까: You trust GitHub MCP for reads but don't want agents to create issues or delete branches.

흐름

Write a policy

Create a guard policy that allows list_* and get_* tools but denies everything else on the github server.✓ 복사됨

→ Policy file with explicit rules
Run guard

Run mcp guard --policy ./policy.yaml -- npx -y @modelcontextprotocol/server-github and point Claude at guard instead of the server directly.✓ 복사됨

→ Denied calls return a clear error, allowed calls proxy through

결과: A read-only façade in front of a powerful server — safer defaults.

조합

다른 MCP와 조합해 10배 효율

mcptools + hyper

Debug hyper-mcp plugin loading with mcp shell before wiring it into Claude

Use mcp shell to list plugins on my hyper-mcp host and test-call each tool.✓ 복사됨

mcptools + claude-code

Validate every MCP server in your Claude Code config with mcp tools

For each server in ~/.claude.json, run mcp tools to verify it starts and advertises a non-empty tool list.✓ 복사됨

도구

이 MCP가 노출하는 것

도구	입력	언제 호출	비용
mcp tools	--transport <stdio\|http\|sse>, -- <server-cmd>	Inspect a server's surface	0
mcp call	<tool-name> --params '<json>' -- <server-cmd>	Ad-hoc call without a client	1 tool call
mcp shell	-- <server-cmd>	Exploratory debugging	0
mcp mock	--config <yaml>	CI / client testing	0
mcp proxy	register <name> --command '<shell>'; serve	Wrap shell into MCP without code	0
mcp guard	--policy <yaml> -- <server-cmd>	Apply allow/deny to an upstream	0

비용 및 제한

운영 비용

API 쿼터: None — local CLI
호출당 토큰: N/A (not an MCP itself)
금액: Free, MIT
팁: Use --format json | jq to automate checks in CI

보안

권한, 시크릿, 파급범위

자격 증명 저장: Passes through to the proxied server; mcptools itself stores nothing

데이터 외부 송신: Only where the proxied/guarded server goes

문제 해결

자주 발생하는 오류와 해결

`mcp tools` hangs forever

Server is writing logs to stdout, corrupting the handshake. Redirect server logs to stderr

확인: mcp tools --timeout 5s -- <cmd>

Binary not found after `go install`

Ensure $GOPATH/bin is on your PATH

확인: which mcp

Guard policy matches nothing

Policy names must match tool names exactly (case-sensitive). Use mcp tools first to confirm names

대안

mcptools 다른 것과 비교

대안	언제 쓰나	단점/장점
MCP Inspector	You prefer a GUI and are okay running a local web app	Heavier; less scriptable than a CLI
Raw jsonrpc via stdio	You're deep-debugging a protocol issue	Verbose; mcptools handles handshake for you

mcptools