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PrecisionContextEngine

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Enables AI coding agents to efficiently navigate and understand large codebases by providing tools for entry point location, call chain analysis, and impact ass

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About

Enables AI coding agents to efficiently navigate and understand large codebases by providing tools for entry point location, call chain analysis, and impact assessment, reducing context consumption and model costs.

README

为 AI 编程 Agent 设计的代码库理解减负及加速层

大型代码库理解的最大成本不是"搜索",而是反复 grep、手工翻目录、拼接调用链带来的上下文消耗。PCE 通过 MCP 暴露的工具接口把入口定位、链路梳理、影响面分析从主 Agent 中拆出来:

  • 节省主 Agent 上下文:代码库调研由 PCE 独立完成,主 Agent 的上下文窗口不被探索过程消耗,得以在一轮会话中连续完成目标任务
  • 降低模型调用成本:PCE 的分析任务不依赖旗舰模型——推荐使用参数量小、速度快的轻量模型,性价比更高,响应更快

推荐模型(实测性价比均衡):xiaomi/mimo-v2-flash · openai/gpt-5.4-mini · openai/gpt-5.4-nano

工具一览

工具 用途
pce_init 绑定项目,构建索引与导航上下文
pce_query 定位入口、梳理模块职责与主干调用链
pce_impact 分析已知目标的影响边界、下游传播链与变更风险
pce_sync 代码变更后增量同步索引与认知状态
pce_status 查看初始化状态、索引信息与 staging 状态

典型工作流:

pce_init → pce_query → pce_impact → [修改代码] → pce_sync
  • 目标未知 → 先用 pce_query
  • 目标已知,评估波及面 → 用 pce_impact
  • 改完代码后 → 用 pce_sync

快速接入(MCP)

推荐直接以 MCP 方式接入,无需手动启动服务。

Claude Code

在 MCP 配置文件中添加:

{
  "pce": {
    "command": "uvx",
    "args": [
      "--from",
      "git+https://github.com/Bluezeamer/PrecisionContextEngine",
      "pce",
      "serve"
    ],
    "env": {
      "PCE_PROVIDER": "openrouter",
      "PCE_MODEL": "openai/gpt-5.4-nano",
      "PCE_API_KEY": "your_api_key",
      "PCE_TEMPERATURE": "1.0",
      "PCE_AGENT_TIMEOUT": "1200"
    }
  }
}

Codex

[mcp_servers.pce]
command = "uvx"
startup_timeout_sec = 60
args = ["--python", "3.11", "--from", "git+https://github.com/Bluezeamer/PrecisionContextEngine", "pce", "serve"]
tool_timeout_sec = 1200

[mcp_servers.pce.env]
PCE_PROVIDER = "openrouter"
PCE_MODEL = "openai/gpt-5.4-nano"
PCE_API_BASE = "https://openrouter.ai/api/v1"
PCE_API_KEY = "your_api_key"
PCE_TEMPERATURE = "1.0"
PCE_AGENT_TIMEOUT = "1200"

[重要]提示词建议

经过实测MCP本身的工具调用提示词在各Agent内部的引导优先级权重不高,容易被淹没在大量的工具噪音里。因此为了强化主Agent适时使用PCE的倾向获得更好的使用体验,建议将AGENTS.md中的内容复制粘贴到你的目标Agent系统提示词约束中——例如对于claudecode来说是CLAUDE.md,对于codex来说是AGENTS.md


环境变量

变量 必填 说明
PCE_PROVIDER LiteLLM provider,如 openrouter / openai / anthropic
PCE_MODEL provider 下的模型名
PCE_API_KEY 对应模型的 API Key
PCE_API_BASE / PCE_BASE_URL 自定义兼容端点
PCE_TEMPERATURE 全局温度,默认 1.0
PCE_AGENT_TIMEOUT Agent 总超时(秒),默认 600
PCE_COMPLETION_RETRIES_PER_MODEL 每模型 completion 重试次数,默认 3
PCE_MODEL_FALLBACKS fallback 模型链,逗号分隔

完整示例见 .env.example


本地部署

环境要求:Python 3.11–3.12,uv

uv sync --all-extras
cp .env.example .env   # 按上表填写必填变量
uv run pce serve       # 以 stdio MCP server 方式运行

License

GPL-3.0

from github.com/Bluezeamer/PrecisionContextEngine

Install PrecisionContextEngine in Claude Desktop, Claude Code & Cursor

Recommended · one command, every IDE
unyly install precisioncontextengine

Installs into Claude Desktop, Claude Code, Cursor & VS Code — handles npx, uvx and build-from-source repos for you.

First time? Get the CLI: curl -fsSL https://unyly.org/install | sh

Or configure manually

Run in your terminal:

claude mcp add precisioncontextengine -- uvx pce

FAQ

Is PrecisionContextEngine MCP free?

Yes, PrecisionContextEngine MCP is free — one-click install via Unyly at no cost.

Does PrecisionContextEngine need an API key?

No, PrecisionContextEngine runs without API keys or environment variables.

Is PrecisionContextEngine hosted or self-hosted?

Self-hosted: the server runs locally on your machine via the install command above.

How do I install PrecisionContextEngine in Claude Desktop, Claude Code or Cursor?

Open PrecisionContextEngine on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.

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