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/irahardianto/rugged-gemini/cpp-idiomsnpx skills add irahardianto/rugged-gemini --skill cpp-idiomsgit clone --depth 1 https://github.com/irahardianto/rugged-geminiWrote 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/irahardianto/rugged-gemini/cpp-idioms)<a href="https://agentmods.dev/skills/irahardianto/rugged-gemini/cpp-idioms"><img src="https://agentmods.dev/badge/skills/irahardianto/rugged-gemini/cpp-idioms.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 5.1 | $0.00000 | $0.00540 |
| Opus 5 | $0.00000 | $0.00270 |
| Sonnet 5 | $0.00000 | $0.00108 |
| Haiku 4.5 | $0.00000 | $0.00054 |
Grade A, and why
cpp-idioms 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.
What it actually says
C++ Idioms and Patterns
Modern C++ (17/20/23) rewards RAII, value semantics, and zero-cost abstractions. Lean into the type system and smart pointers. Idiomatic C++ = safe, deterministic, performant.
Scope: C++ coding idioms. Test naming: GEMINI.md § Testing Strategy.
Ownership and Memory
- RAII — resources tied to object lifetime. No manual
new/delete. std::unique_ptrfor exclusive ownership,std::shared_ptronly when sharing is necessary.- Move semantics — prefer moving over copying for expensive types.
Error Handling
std::expected(C++23) or Result types for expected failures.- Exceptions for exceptional conditions only. Never for control flow.
noexcepton move constructors and destructors.
Modern Features
std::string_viewfor read-only string parameters (no allocation).constexprfor compile-time evaluation.- Structured bindings:
auto [id, title] = getTask(); std::optionalfor nullable values.
Naming
- PascalCase for types. camelCase or snake_case for functions (project-consistent).
_suffix for private members:storage_,logger_.- No Hungarian notation.
Testing
Google Test or Catch2. Google Mock for interface mocking.
Formatting and Static Analysis
| Tool | Purpose | Command |
|---|---|---|
clang-format |
Formatting | clang-format -i src/**/*.cpp |
clang-tidy |
Static analysis | clang-tidy src/*.cpp -- |
cppcheck |
Bug detection | cppcheck --enable=all src/ |
| AddressSanitizer | Memory errors | -fsanitize=address |
| ThreadSanitizer | Race conditions | -fsanitize=thread |
Related
- Code Idioms and Conventions GEMINI.md § Code Idioms and Conventions
- Resources and Memory Management @.gemini/skills/resources-and-memory-management/SKILL.md
- Concurrency and Threading Principles @.gemini/skills/concurrency-and-threading-principles/SKILL.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.
- 5d ago First seen · 58 lines · 0 tokens per session scan A a328b5ed7bab
cpp-idioms is a skill published in the GitHub repository irahardianto/rugged-gemini (5 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 540 tokens. 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 2026-08-31.
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