Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/mcpp-community/mcpp/mcpp-usagenpx skills add mcpp-community/mcpp --skill mcpp-usagegit clone --depth 1 https://github.com/mcpp-community/mcppWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00051 | $0.01379 |
| Opus 5 | $0.00026 | $0.00690 |
| Sonnet 5 | $0.00010 | $0.00276 |
| Haiku 4.5 | $0.00005 | $0.00138 |
Grade C, and why
mcpp-usage scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://github.com/mcpp-community/mcpp/releases/latest/download/install.sh | bash Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://github.com/mcpp-community/mcpp/releases/latest/download/install.sh | bash How it starts
The opening of the file, as written. The whole thing — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.
mcpp 基础用法
Overview
mcpp 是一个现代 C++ 模块化构建工具，纯 C++23 模块编写，已实现自举。一条命令安装，import std 开箱即用。
- 仓库：https://github.com/mcpp-community/mcpp
- 文档：https://github.com/mcpp-community/mcpp/tree/main/docs
- 包索引：https://github.com/mcpp-community/mcpp-index
- 模块化库：https://github.com/mcpplibs
Quick Reference
| 命令 | 用途 |
|---|---|
mcpp new <name> |
创建项目 |
mcpp build |
构建 |
mcpp run [-- args] |
构建并运行 |
mcpp test [pattern] [-- args] |
发现并运行 tests/**/*.cpp 测试 |
mcpp add <pkg>[@ver] |
添加依赖 |
mcpp remove <pkg> |
移除依赖 |
mcpp update [pkg] |
更新依赖 |
mcpp search <keyword> |
搜索包 |
mcpp toolchain list |
查看工具链 |
mcpp toolchain install gcc 16 |
安装工具链 |
mcpp pack |
打包 |
mcpp why [toolchain｜runtime｜deps] |
解释解析出的构建决策 |
mcpp --offline |
只使用已有本地状态 |
mcpp self doctor |
环境诊断 |
mcpp explain <CODE> |
错误码解释 |
安装
# 推荐；Windows 请在 PowerShell 中运行
xlings install mcpp -y
# 或 Unix release 一键脚本（仅 Linux x86_64/aarch64 与 macOS ARM64）
curl -fsSL https://github.com/mcpp-community/mcpp/releases/latest/download/install.sh | bash
一键脚本不支持 Windows；Windows 使用 PowerShell 的 xlings 安装命令。安装到
~/.mcpp/ 后会自动加入 PATH。首次使用时，mcpp 按宿主选择默认工具链并
安装到隔离沙盒：Linux 通常为 GCC，macOS 为 LLVM，Windows 在有可用 MSVC
时为 LLVM，否则为面向 x86_64-windows-gnu 的 MinGW-w64 GCC。
创建项目
mcpp new hello && cd hello
mcpp build
mcpp run
生成的项目包含最小 manifest 和可立即运行的 smoke test：
[package]
name = "hello"
version = "0.1.0"
description = "A modular C++23 package"
license = "Apache-2.0"
src/main.cpp 会自动推断为 binary target，tests/test_smoke.cpp 会由
mcpp test 自动发现；无需手写 [targets.hello]。
mcpp.toml 配置
[package]
name = "myapp"
version = "0.1.0"
[targets.myapp]
kind = "bin" # bin / lib / shared; tests are discovered from tests/**/*.cpp
main = "src/main.cpp"
[dev-dependencies]
gtest = "1.15.2" # 仅测试使用；SemVer: ^, ~, 范围, 精确
[toolchain]
default = "[email protected]"
更多配置：https://github.com/mcpp-community/mcpp/blob/main/docs/05-mcpp-toml.md
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 148 lines · 51 tokens per session scan C c3b89a0d0ef4
mcpp-usage is a skill published in the GitHub repository mcpp-community/mcpp (114 stars, last pushed 2d ago), licensed Apache-2.0. It adds 51 tokens to every session and 1,379 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
readable-cpp
Readable C/C++/Rust/CUDA code rules inspired by The Art of Readable Code. Use when writing, reviewing, or refactoring C, C++, Rust, or CUDA code. Enforces short functions, flat control flow, clear naming, readable structure, and idiomatic patterns.
cpp
Comprehensive C/C++ programming reference covering everything from C11-C23 and C++11-C++23, system programming, CUDA GPU computing, debugging tools, Rust interop, and advanced topics. Use for: C/C++ questions, C/C++ interview preparation, modern language features, RAII/memory management, templates/generics, CUDA…
mcpp-style-ref
为 mcpp 项目应用 Modern/Module C++ (C++23) 编码风格。适用于编写或审查带模块的 C++ 代码、命名标识符、组织 .cppm/.cpp 文件，或用户提及 mcpp、module C++、现代 C++ 风格时。.
mbun-runtime-debugging
调试 mbun 运行时测试失败/崩溃时用。提供仓库实测可用的定位配方——选二进制、单文件跑测、gdb 抓 backtrace、按 API 定位源码、常见坑排查清单、何时跳过。凡处理 bun 测试跑不过/段错误/hang/断言失败，先读本 skill 再动手，避免每个 task 重复摸索拖慢。.
dev-process
在本仓开发任何改动前用。规定 issue 先行的开发流程,按 bugfix / 优化 / 新功能分流;新功能须经 issue 充分讨论并在 .agents/docs 落地设计方案;衔接 tdd-workflow 与本体验证 / 测试 / CI / PR 规范。开发前先读本 skill。.
issue-reporting
向本仓提交 issue / 发起讨论时用。规定一份好问题反馈的 SOP——软件/版本、报错信息、初步分析、相关资料,并去除本地隐私(用户名/token 等替换)。凡要创建 issue、反馈 bug、发起讨论,先读本 skill 再动手。.