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d2mcpp: Skill for Claude Code

.agents/skills/d2mcpp-authoring/SKILL.md

d2mcpp-authoring is a skill for Claude Code, Codex from mcpp-community/d2mcpp. It costs 141 tokens per session (2,901 once invoked), scanned A, original, no licence file.

A set of writing rules for the d2mcpp Modern C++ tutorial project, including its lessons, exercises, reference solutions, and contents list.

In plain words
What is it for?
It helps add or update C++ language-feature lessons and register them in the summary and changelog.
Why use it?
It keeps new or edited tutorial material consistent with the project's design and file conventions.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is mcpp-community/d2mcpp's own configuration. It tells Claude Code and Codex how to work on d2mcpp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything d2mcpp configures →

not rated 1.8krepo +3 7d ago A scan 141 tokens custom licence
View source ↗ mcpp-community/d2mcpp mcpp.d2learn.org
Reuse

Borrowing it

Nothing to install: this file belongs to mcpp-community/d2mcpp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/mcpp-community/d2mcpp/main/.agents/skills/d2mcpp-authoring/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/mcpp-community/d2mcpp

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for d2mcpp-authoring

README.md
[![agentmods](https://agentmods.dev/badge/skills/mcpp-community/d2mcpp/d2mcpp-authoring/github.svg)](https://agentmods.dev/skills/mcpp-community/d2mcpp/d2mcpp-authoring)
Your own site
<a href="https://agentmods.dev/skills/mcpp-community/d2mcpp/d2mcpp-authoring"><img src="https://agentmods.dev/badge/skills/mcpp-community/d2mcpp/d2mcpp-authoring/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for d2mcpp-authoring

Your own site · 80×15
<a href="https://agentmods.dev/skills/mcpp-community/d2mcpp/d2mcpp-authoring"><img src="https://agentmods.dev/badge/skills/mcpp-community/d2mcpp/d2mcpp-authoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 141 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,901 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 5.1 $0.00141 $0.02901
Opus 5.5 $0.00056 $0.01160
Sonnet 5.5 $0.00028 $0.00580
Haiku 4.5 $0.00014 $0.00290

Measured 2mo ago against content hash 39d94cad72d7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

d2mcpp-authoring 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 2mo 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.

.agents/skills/d2mcpp-authoring/SKILL.md · 191 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2mo ago First seen · 191 lines · 141 tokens per session scan A 39d94cad72d7

Subscribe to this mod's changes

d2mcpp-authoring is a skill published in the GitHub repository mcpp-community/d2mcpp (1,799 stars, last pushed 7d ago), with no licence file. It adds 141 tokens to every session and 2,901 once invoked, about $0.0006 per session on Opus 5.5. 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.

C and C++LanguagesWriting and docscoursed2xexercisesmodern-cppopen-source
Related

d2mcpp-authoring compared with skills from other repositories

d2mcpp-authoring next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
d2mcpp-authoringmcpp-community/d2mcppSkill1.8k7d agononeA141Claude Code, Codex
cpp-engineer-skilllschaffer/tealkitSkill83d agoMITA38Claude Code, Codex
source-command-implementthecompez/ai-for-modern-cppSkill2710d agononeA18Claude Code, Codex
source-command-add-modulethecompez/ai-for-modern-cppSkill2710d agononeA23Claude Code, Codex
source-command-reviewthecompez/ai-for-modern-cppSkill2710d agononeA19Claude Code, Codex
zoom-meeting-sdk-unrealanthropics/knowledge-work-pluginsSkill35k2d agoApache-2.0A41Claude Code
doca-argpNVIDIA/skillsSkill3.9kyesterdayApache-2.0A277Claude Code, Codex