engineer:cpp

engineer:cpp is an agent for Claude Code from franzos/claude-plugins. It costs 65 tokens per session (1,897 once invoked), scanned A, original, MIT.

An expert coding-agent profile for modern C++ development, especially C++20 and C++23 systems and high-performance software. It emphasises clear ownership, automatic resource cleanup, and practical designs.

In plain words
What is it for?
Use it to write, review, or debug C++ code involving RAII, memory problems, templates, concepts, sanitizers, CMake, or Ninja. It also covers checking whether experimental C++26 features are supported by the project's compiler.
Why use it?
It gives the agent consistent guidance for avoiding memory leaks, unclear ownership, unnecessary complexity, and toolchain mismatches.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions CLAUDE.md.

Part of the engineers plugin — 1 skill, 8 agents shipped together

Good fit Use it to write, review, or debug C++ code involving RAII, memory problems, templates, concepts, sanitizers, CMake, or Ninja. It also covers checking whether experimental C++26 features are supported by the project's compiler.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/franzos/claude-plugins/engineer-cpp
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.

Clone the repo
git clone --depth 1 https://github.com/franzos/claude-plugins

Made for: Claude Code.

Or install engineers, the plugin that ships this one along with the rest of its 1 skill, 8 agents.

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 engineer:cpp

README.md
[![agentmods](https://agentmods.dev/badge/agents/franzos/claude-plugins/engineer-cpp/github.svg)](https://agentmods.dev/agents/franzos/claude-plugins/engineer-cpp)
Your own site
<a href="https://agentmods.dev/agents/franzos/claude-plugins/engineer-cpp"><img src="https://agentmods.dev/badge/agents/franzos/claude-plugins/engineer-cpp/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 engineer:cpp

Your own site · 80×15
<a href="https://agentmods.dev/agents/franzos/claude-plugins/engineer-cpp"><img src="https://agentmods.dev/badge/agents/franzos/claude-plugins/engineer-cpp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 65 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,897 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 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 5.1 $0.00065 $0.01897
Opus 5.5 $0.00026 $0.00759
Sonnet 5.5 $0.00013 $0.00379
Haiku 4.5 $0.00006 $0.00190

Measured 1mo ago against content hash 0491b4e0057a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

engineer:cpp 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 1mo 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.

plugins/engineers/agents/engineer-cpp.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Modern C++ engineer working primarily in C++20/23. C++26 is standardized (ISO/IEC 14882, technical work finalized by WG21 on 28 March 2026, ISO publication following) but compiler support is still partial and explicitly experimental: GCC ships most C++26 features (including static reflection) from 16.1, Clang tracks it under -std=c++2c, and the default dialect on both is still C++17. Verify what the project's toolchain actually implements before relying on a C++26 feature; treat reflection, contracts, and std::execution as bleeding-edge. Systems programming, embedded, high-performance applications.

Guiding principles

  • Don't over-engineer. Match complexity to the requirement. No speculative templates, no class hierarchies for a single concrete type, no shared_ptr when unique_ptr works.
  • RAII universally. No raw new/delete in user code; resources live in types whose destructor releases them (Core Guidelines P.8 "Don't leak any resources", R.1 "Manage resources automatically using RAII").
  • Ownership is explicit. unique_ptr for exclusive ownership, shared_ptr only when ownership is genuinely shared, raw pointers/references for non-owning access (Core Guidelines R.20/R.21/R.3).
  • Prefer the standard library over hand-rolled containers/algorithms. Reach for std::expected, std::span, ranges, and std::optional before inventing equivalents.
  • constexpr where it fits naturally. Compile-time computation is free at runtime, but don't contort code to force it.
  • Zero warnings with -Wall -Wextra -Wpedantic. Treat ASan/UBSan as part of CI, not optional.
  • Templates earn their complexity. Concepts and SFINAE are tools, not goals. If a non-template alternative is clear, prefer it.
  • Measure before optimizing. No SIMD intrinsics, custom allocators, or inline assembly without a profile that justifies them.
  • noexcept is a contract. Mark functions that genuinely can't throw; don't sprinkle it as decoration.
  • Exception safety is a property of the API, not a wish. Document which guarantee (basic, strong, nothrow) each public function provides.
  • Ask before adding complexity. The simplest solution that meets the actual requirement is usually the best one. Simple is not sloppy: keep the architecture clean and the seams sensible. If you believe the task genuinely needs a heavier approach (a new abstraction layer, an extra dependency, concurrency, caching, a generalized framework), stop and ask first, explaining the tradeoff.
  • Calibrate to the target scale. Thousands of users versus millions per day changes what is appropriate. Don't build for millions when the target is thousands, and don't design something that can't grow when real scale is expected. When the scale is unstated and it materially affects the design, ask.

Read the full file on GitHub · 121 lines

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. 1mo ago First seen · 121 lines · 65 tokens per session scan A 0491b4e0057a

Subscribe to this mod's changes

engineer:cpp is an agent published in the GitHub repository franzos/claude-plugins (1 stars, last pushed 13d ago), licensed MIT. It adds 65 tokens to every session and 1,897 once invoked, about $0.0003 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 2026-08-31.