Context Mode MCP — 使用场景, 安装 & 实时演示

为什么要用

核心特性

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

实时演示

实际使用效果

context-mode-mcp.replay ▶ 就绪

0/0

安装

选择你的客户端

~/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"
      ]
    }
  }
}

打开 Claude Desktop → Settings → Developer → Edit Config。保存后重启应用。

~/.cursor/mcp.json · .cursor/mcp.json

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

Cursor 使用与 Claude Desktop 相同的 mcpServers 格式。项目级配置优先于全局。

VS Code → Cline → MCP Servers → Edit

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

点击 Cline 侧栏中的 MCP Servers 图标，然后选 "Edit Configuration"。

~/.codeium/windsurf/mcp_config.json

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

格式与 Claude Desktop 相同。重启 Windsurf 生效。

~/.continue/config.json

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

Continue 使用服务器对象数组，而非映射。

~/.config/zed/settings.json

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

加入 context_servers。Zed 保存后热重载。

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

一行命令搞定。用 claude mcp list 验证，claude mcp remove 卸载。

使用场景

实战用法： Context Mode

Stop wasting context on raw tool output

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

何时使用： You feel your agent "forget" after 30 minutes and burn $$ on re-reads.

前置条件

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

步骤

Install

/plugin marketplace add mksglu/context-mode
/plugin install context-mode@context-mode✓ 已复制

→ Plugin registers hooks + 6 sandbox tools
Verify

/context-mode:ctx-doctor✓ 已复制

→ All checks [x]
Use normally

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

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

/context-mode:ctx-stats✓ 已复制

→ Per-tool reduction ratio reported

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

注意事项

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

搭配使用： serena

Resume a long task seamlessly after the model compacts

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

何时使用： Your task is too big to fit in one context window.

步骤

Start with --continue

[CLI flag] claude --continue✓ 已复制

→ Prior session's SQLite loaded
Observe

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

→ Accurate recap from FTS5 index, not hallucinated

结果： A genuinely resumable workflow.

注意事项

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

组合

与其他 MCP 搭配，撬动十倍杠杆

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.✓ 已复制

context-mode-mcp + playwright

Page snapshot output stays sandboxed

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

工具

此 MCP 暴露的能力

工具	输入参数	何时调用	成本
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

成本与限制

运行它的成本

API 配额: Local
每次调用 Token 数: Dramatic reduction — quoted 98% on real sessions
费用: Free (ELv2 license)
提示: The bigger the session, the bigger the win — use on long tasks

安全

权限、密钥、影响范围

凭据存储： Session SQLite in ~/.context-mode/

数据出站： None

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

故障排查

常见错误与修复

ctx-doctor shows missing hooks

Restart Claude Code fully after install; hooks register at startup

验证： 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.

替代方案

Context Mode 对比其他方案

替代方案	何时用它替代	权衡
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

为什么要用

核心特性

实时演示

实际使用效果

安装

选择你的客户端

使用场景

实战用法： Context Mode

Stop wasting context on raw tool output

前置条件

步骤

注意事项

Resume a long task seamlessly after the model compacts

步骤

注意事项

组合

与其他 MCP 搭配，撬动十倍杠杆

工具

此 MCP 暴露的能力

成本与限制

运行它的成本

安全

权限、密钥、影响范围

故障排查

常见错误与修复

替代方案

Context Mode 对比其他方案

更多

资源