Context Mode MCP — 사용 사례, 설치 & 라이브 데모

왜 쓰나요

핵심 기능

98% context reduction via sandboxed tool execution
Per-session SQLite FTS5 index survives compaction
Automatic routing hooks (PreToolUse, PostToolUse, PreCompact, SessionStart)
12 platforms supported (Claude Code, Cursor, Codex, Gemini CLI, Copilot…)
'Think in code' paradigm — have the LLM write scripts, not process data itself

라이브 데모

실제 사용 모습

context-mode-mcp.replay ▶ 준비됨

0/0

설치

클라이언트 선택

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

{
  "mcpServers": {
    "context-mode-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "context-mode"
      ]
    }
  }
}

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

~/.cursor/mcp.json · .cursor/mcp.json

{
  "mcpServers": {
    "context-mode-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "context-mode"
      ]
    }
  }
}

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

VS Code → Cline → MCP Servers → Edit

{
  "mcpServers": {
    "context-mode-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "context-mode"
      ]
    }
  }
}

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

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "context-mode-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "context-mode"
      ]
    }
  }
}

Claude Desktop과 같은 형식. Windsurf 재시작 후 적용.

~/.continue/config.json

{
  "mcpServers": [
    {
      "name": "context-mode-mcp",
      "command": "npx",
      "args": [
        "-y",
        "context-mode"
      ]
    }
  ]
}

Continue는 맵이 아닌 서버 오브젝트 배열 사용.

~/.config/zed/settings.json

{
  "context_servers": {
    "context-mode-mcp": {
      "command": {
        "path": "npx",
        "args": [
          "-y",
          "context-mode"
        ]
      }
    }
  }
}

context_servers에 추가. 저장 시 Zed가 핫 리로드.

claude mcp add context-mode-mcp -- npx -y context-mode

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

사용 사례

실전 활용법: Context Mode

Stop wasting context on raw tool output

👤 Heavy Claude Code users who hit compaction mid-session ⏱ ~15 min intermediate

언제 쓸까: You feel your agent "forget" after 30 minutes and burn $$ on re-reads.

사전 조건

Claude Code v1.0.33+ — brew upgrade claude-code or npm update -g @anthropic-ai/claude-code

흐름

Install

/plugin marketplace add mksglu/context-mode
/plugin install context-mode@context-mode✓ 복사됨

→ Plugin registers hooks + 6 sandbox tools
Verify

/context-mode:ctx-doctor✓ 복사됨

→ All checks [x]
Use normally

Now do a big task that would normally blow context — e.g. analyze all .log files under /var/log✓ 복사됨

→ ctx_execute used instead of raw Read; output indexed not dumped
Check savings

/context-mode:ctx-stats✓ 복사됨

→ Per-tool reduction ratio reported

결과: Same task, 10x longer before compaction, and the agent remembers.

함정

Other MCPs bypass the routing — Pass their tool calls through ctx_batch_execute for consistent accounting

함께 쓰기: serena

Resume a long task seamlessly after the model compacts

👤 Devs on multi-hour agent sessions ⏱ ~5 min beginner

언제 쓸까: Your task is too big to fit in one context window.

흐름

Start with --continue

[CLI flag] claude --continue✓ 복사됨

→ Prior session's SQLite loaded
Observe

What did I last ask you about? What tasks are in progress?✓ 복사됨

→ Accurate recap from FTS5 index, not hallucinated

결과: A genuinely resumable workflow.

함정

Forgetting --continue starts fresh — Persistence requires --continue; absence means deliberate fresh start

조합

다른 MCP와 조합해 10배 효율

context-mode-mcp + serena

Serena for semantic code nav, context-mode for keeping its output out of context

Use serena for the lookup, ctx_execute to post-process the results.✓ 복사됨

context-mode-mcp + playwright

Page snapshot output stays sandboxed

Snapshot the page via playwright, let context-mode hold it — search it instead of dumping.✓ 복사됨

도구

이 MCP가 노출하는 것

도구	입력	언제 호출	비용
ctx_execute	code: str (js/python)	Run a script to process data; output only what's needed	free
ctx_batch_execute	ops: [{tool, args}]	Wrap multiple tool calls through the sandbox	free
ctx_index	content: str, tags?: []	Stash data for later retrieval	free
ctx_search	query: str	Retrieve from session index	free
ctx_fetch_and_index	url: str	Pull a URL, keep it out of context but searchable	free
ctx_stats	none	See how much context was saved	free

비용 및 제한

운영 비용

API 쿼터: Local
호출당 토큰: Dramatic reduction — quoted 98% on real sessions
금액: Free (ELv2 license)
팁: The bigger the session, the bigger the win — use on long tasks

보안

권한, 시크릿, 파급범위

자격 증명 저장: Session SQLite in ~/.context-mode/

데이터 외부 송신: None

SQLite persists across sessions only if you use --continue — otherwise it's wiped

문제 해결

자주 발생하는 오류와 해결

ctx-doctor shows missing hooks

Restart Claude Code fully after install; hooks register at startup

확인: Re-run /context-mode:ctx-doctor

Sandbox won't execute code

Node/Python runtime missing. Doctor tells you which. Install with brew/asdf.

Search returns nothing

Verify FTS5 built: sqlite3 ~/.context-mode/session.db "SELECT name FROM sqlite_master". Reinstall if broken.

대안

Context Mode 다른 것과 비교

대안	언제 쓰나	단점/장점
Raw Claude Code (no plugin)	Short sessions that never hit compaction	No context saving
claude-mem	You want the memory layer without the sandbox-tool paradigm	Different tradeoff — memory only, no tool output sandbox

Context Mode