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C++ Pro · jeffallan | DecimalAI

codingby jeffallan

C++ Pro

jeffallan/cpp-pro

Source jeffallan/claude-skills ↗License MIT

Writes, optimizes, and debugs C++ applications using modern C++20/23 features, template metaprogramming, and high-performance systems techniques.

SkillScore92Maintained

Automatic

Coding pack

Last verified 10/9/2026

What it changes

Passed 22 of 24 test cases with the skill, and 16 of 24 without it.

Without skill67%

With skill92%

Checks it passed that the model alone missed

Explicitly deletes the copy constructor.
Provides a CMakeLists.txt configuration file.
Instantiates config object via std::make_shared.

and 6 more in the full report

6 fixed16 passed either way2 still failing0 broke

Pass-rate lift: +25 pp
Tokens: +55%
Agent turns: 0%
Response time: +30%

Model gemini-3.6-flashMeasured 10/9/2026v222 of 24 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/jeffallan-cpp-pro/SKILL.md https://app.decimal.ai/s/jeffallan-cpp-pro/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add jeffallan-cpp-pro, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/jeffallan-cpp-pro/ and pins it in .decimal/skills.lock

decimalai skills add jeffallan-cpp-pro

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/jeffallan-cpp-pro/SKILL.md https://app.decimal.ai/s/jeffallan-cpp-pro/SKILL.md

Raw file: /s/jeffallan-cpp-pro/SKILL.md ↗ · machine-readable summary at /s/jeffallan-cpp-pro.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 6

Prompt

We need a zero-overhead resource handle wrapper for system file descriptors that enforces single-ownership semantics. Please furnish a complete modern C++ solution containing the header file, source implementation, CMakeLists updates, a comprehensive test file, and a concise write-up of your design choices and runtime trade-offs.

What was checked, without and with the skill
Checked	Without skill	With skill
Explicitly deletes the copy constructor.	Missed	Passed
Avoids using the raw new operator.	Passed	Passed
Configures -fsanitize=address flag in CMake build settings.	Missed	Passed

case-03 · gemini-3.6-flash · 10/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md104 lines6 files

C++ Pro

Senior C++ developer with deep expertise in modern C++20/23, systems programming, high-performance computing, and zero-overhead abstractions.

Core Workflow

Analyze architecture — Review build system, compiler flags, performance requirements
Design with concepts — Create type-safe interfaces using C++20 concepts
Implement zero-cost — Apply RAII, constexpr, and zero-overhead abstractions
Verify quality — Run sanitizers and static analysis; if AddressSanitizer or UndefinedBehaviorSanitizer report issues, fix all memory and UB errors before proceeding
Benchmark — Profile with real workloads; if performance targets are not met, apply targeted optimizations (SIMD, cache layout, move semantics) and re-measure

Reference Guide

Load detailed guidance based on context:

Topic	Reference	Load When
Modern C++ Features	`references/modern-cpp.md`	C++20/23 features, concepts, ranges, coroutines
Template Metaprogramming	`references/templates.md`	Variadic templates, SFINAE, type traits, CRTP
Memory & Performance	`references/memory-performance.md`	Allocators, SIMD, cache optimization, move semantics
Concurrency	`references/concurrency.md`	Atomics, lock-free structures, thread pools, coroutines
Build & Tooling	`references/build-tooling.md`	CMake, sanitizers, static analysis, testing

Constraints

MUST DO

Follow C++ Core Guidelines
Use concepts for template constraints
Apply RAII universally
Use auto with type deduction
Prefer std::unique_ptr and std::shared_ptr
Enable all compiler warnings (-Wall -Wextra -Wpedantic)
Run AddressSanitizer and UndefinedBehaviorSanitizer
Write const-correct code

MUST NOT DO

Use raw new/delete (prefer smart pointers)
Ignore compiler warnings
Use C-style casts (use static_cast, etc.)

Track record

Benchmark

22 / 24

test cases passed, vs 16 / 24 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 10/8/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

jeffallan / claude-skills

skills/cpp-pro/SKILL.md

View on GitHub ↗

License MITImported 10/8/2026Version v2Bundled 5 files

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See it in action

What's inside

C++ Pro

Core Workflow

Reference Guide

Constraints

MUST DO

MUST NOT DO

Track record

Benchmark

Adoption

SkillSafety

Source

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