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/iliaal/ai-skills/cpp-systemsnpx skills add iliaal/ai-skills --skill cpp-systemsgit clone --depth 1 https://github.com/iliaal/ai-skillsWrote 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.
[](https://agentmods.dev/skills/iliaal/ai-skills/cpp-systems)<a href="https://agentmods.dev/skills/iliaal/ai-skills/cpp-systems"><img src="https://agentmods.dev/badge/skills/iliaal/ai-skills/cpp-systems.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00078 | $0.02931 |
| Opus 5 | $0.00039 | $0.01465 |
| Sonnet 5 | $0.00016 | $0.00586 |
| Haiku 4.5 | $0.00008 | $0.00293 |
Grade A, and why
cpp-systems 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 5d 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.
How it starts
The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.
C++ Systems & Libraries
Covers C++17 as the baseline, with C++20 features called out where a project's standard allows them. For plain C (manual lifetimes, status enums, native extensions), see the ia-c-systems skill.
Repo conventions outrank this skill
Check CMakeLists.txt for CXX_STANDARD, read .clang-format and .clang-tidy, and read two adjacent translation units before writing. Where they conflict with the rules below, they win.
The conflicts that actually happen:
| Local constraint | Consequence |
|---|---|
-fno-exceptions |
Error handling is codes or expected-alikes. Constructors cannot report recoverable failure, so use a fallible factory or construct a valid fallback state. new (std::nothrow) only where the project's OOM policy is to observe null and recover; plain new is fine where the policy is termination |
| Standard pinned below C++17 | No std::optional/string_view/structured bindings/if constexpr; check before using any |
| Public header is ABI-stable | No layout changes, no inline-function changes, no added virtuals: load the ABI reference |
| Embedded or freestanding target | No RTTI, no dynamic allocation in hot paths, possibly no STL containers |
Tooling
| Tool | Purpose |
|---|---|
cmake |
Build system; CMAKE_EXPORT_COMPILE_COMMANDS=ON feeds every other tool |
clang-format |
Formatter, driven by the repo's .clang-format |
clang-tidy |
Lint (bugprone-*, performance-*, modernize-*, cppcoreguidelines-*) |
| ASan + UBSan | -fsanitize=address,undefined; TSan separately for threaded code |
gtest / catch2 |
Unit tests |
include-what-you-use |
Cuts transitive-include creep that slows builds and hides dependencies |
ccache |
Compile cache; the single biggest iteration-speed win on a C++ tree |
Build with -Wall -Wextra -Wpedantic -Wshadow -Wconversion and treat warnings as errors in CI.
Ownership and RAII
Every resource has exactly one owner, and that owner is an object whose destructor releases it. A raw new or delete in application code is a defect.
What ships with it
4 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.
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.
- 5d ago First seen · 147 lines · 78 tokens per session scan A 56385847391c
cpp-systems is a skill published in the GitHub repository iliaal/ai-skills (40 stars, last pushed 6d ago), licensed MIT. It adds 78 tokens to every session and 2,931 once invoked, about $0.0004 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.
Other skills, from other repositories
antv-x6-editor
Use this skill whenever the user wants to create, customize, or troubleshoot X6 v3 graph editor diagrams. Triggers include: any mention of 'X6', 'antv x6', '@antv/x6', 'X6 editor', 'X6 图编辑', '流程图', 'DAG', 'ER图', '实体关系图', '血缘图', '组织架构图', 'UML类图', 'flowchart', 'DAG diagram', 'ER diagram', 'lineage graph', 'org chart'…
gpt-vis
推荐并生成合适的数据可视化图表，使用 GPT-Vis 库。支持两种输出模式：（1）语法模式——生成 Syntax 或 JSON 配置；（2）代码模式——生成完整的运行代码。支持 26 种图表类型。.
infographic-creator
Create beautiful infographics based on given text content. Use when users request to create infographics.
antv-g2-chart
Use this skill whenever the user wants to create, customize, or troubleshoot G2 v5 chart visualizations. Triggers include: any mention of 'G2', 'antv g2', '@antv/g2', 'G2 chart', 'G2 可视化', or requests to produce charts like bar charts (柱状图), line charts (折线图), pie charts (饼图), scatter plots (散点图), area charts (面积图)…
antv-skills-maintainer
Automatically sync documentation and configuration after any skill is added or updated. Triggers on every AI code execution to keep README Available Skills and .claude-plugin/marketplace.json up to date.
icon-retrieval
Search icons through HTTP API and retrieve SVG strings with curl.