explain

A command that teaches a C++ concept using the repository's existing learning materials and examples. It explains both why the concept matters and how it works, with a small compilable example.

In plain words
What is it for?
Use it to learn concepts such as `std::move` or `memory_order_acquire`. It produces an explanation, verified code for a specified C++ standard, and links to the related project article and cppreference.
Why use it?
It keeps explanations aligned with the project's teaching order and writing style instead of giving an unrelated generic lesson. It also checks claims about C++ behavior and addresses common misunderstandings.

Command for Claude Code

Install

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.

agentmods
npx agentmods add commands/awesome-embedded-learning-studio/tutorial_awesomemoderncpp/explain
Clone the repo
git clone --depth 1 https://github.com/Awesome-Embedded-Learning-Studio/Tutorial_AwesomeModernCPP

Made for: Claude Code.

Per session 41 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 490 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What 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.

ModelPer sessionOnce invoked
Fable 5 $0.00041 $0.00490
Opus 5 $0.00020 $0.00245
Sonnet 5 $0.00008 $0.00098
Haiku 4.5 $0.00004 $0.00049

Measured 2d ago against content hash c03e40663a0b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

explain scanned grade A with 0 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 2d ago.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/commands/explain.md · 29 lines

What it actually says

/explain — 给学习者讲一个 C++ 概念

受众:懂 Agent、正在学 C++ 的人。你的任务是当导师,核心是别让学习者绕弯。严格按 learning-with-agents.md 的四条守则。

输入

$ARGUMENTS —— 要讲解的概念(如 memory_order_acquirestd::move)。为空则停下问。

流程(四守则)

  1. 定位:先在本仓库找项目怎么讲这个概念 —— 查 documents/roadmap/index.md(学习顺序)和各卷 documents/vol*/index.md,grep 概念名,读项目已有处理。别凭通用记忆现编一套,对齐项目的讲法和进度。
  2. 验证:凡涉及 C++ 行为断言,先编译实测或查 cppreference 标版本(做法同 /verify-claim)。禁止凭记忆断言。
  3. 讲解:用项目声音讲(writing-style.md Part 2)—— 讲"为什么"、类比 + 机制拆解、标志性句式、鼓励读者自己跑代码。
  4. 纠偏:概念若有常见误解,主动点破(查 faq.md)。

输出

一段项目风格的讲解 + 最小可编译代码(标 C++ 标准)+ 链接:项目对应文章 + cppreference。

硬约束

  • 编译验证产物只到 /tmp/,不跑 cmake / make / build。
  • 讲解里的每条 C++ 行为都要能验证;不确定就说"我验一下"。
Changes

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.

  1. 2d ago First seen · 29 lines · 41 tokens per session scan A c03e40663a0b

Subscribe to this mod's changes

explain is a command published in the GitHub repository Awesome-Embedded-Learning-Studio/Tutorial_AwesomeModernCPP (250 stars, last pushed 2d ago), licensed MIT. It adds 41 tokens to every session and 490 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.