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Agent skill

Carbon Lang

by mohitmishra786 in mohitmishra786/low-level-dev-skills

Carbon language skill for C++ interop and toolchain. An agent skill from mohitmishra786/low-level-dev-skills.

MITAuto-check passed

Install Carbon Lang

skills CLI
$ npx skills add mohitmishra786/low-level-dev-skills --skill carbon-lang -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mohitmishra786/low-level-dev-skills carbon-lang --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/languages/carbon-lang .claude/skills/carbon-lang && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
carbon-lang
GitHub stars
252
Token cost
~1.3k tokens
SKILL.md length
341 words
Files
1
Skills in repo
138
Repo updated
First seen
Licence
MIT

At a glance

Carbon language skill for C++ interop and toolchain. An agent skill from mohitmishra786/low-level-dev-skills.

  • Works in 9 steps: Project status awareness → Build carbon-toolchain → Basic syntax → …
  • Evaluating Carbon syntax
  • SKILL.md covers Purpose, When to Use, Workflow and Common Problems, plus 1 more section
  • Calls git; reaches github.com and carbon.compiler-explorer.com

What it does

Carbon Lang is an agent skill from mohitmishra786/low-level-dev-skills. Carbon language skill for C++ interop and toolchain. Use when evaluating Carbon syntax, bidirectional C++ interop, building carbon-toolchain, or comparing Carbon vs C++. Activates on queries about Carbon language, Carbon.h, carbon-toolchain, checked borrows, or C++ successor.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with C++. The repository describes itself as: A curated suite of AI agent skills for systems and low-level programming with C/C++, Rust, and Zig toolchains, covering compilers, debuggers, profilers, build systems…. The licence is MIT.

When your agent uses it

  • Evaluating Carbon syntax
  • Bidirectional C++ interop
  • Building carbon-toolchain
  • Comparing Carbon vs C++

Example prompts

  • “/carbon-lang”

Workflow steps

9 steps, taken from the step headings in SKILL.md.

  1. Project status awareness
  2. Build carbon-toolchain
  3. Basic syntax
  4. C++ interop — calling C++ from Carbon
  5. Carbon.h — exposing Carbon to C++
  6. Memory safety — checked borrows (experimental)
  7. Current limitations
  8. Carbon vs C++ decision tree
  9. Build a Carbon file

What it can do on your machine

Read from SKILL.md and the folder at commit bdc5847. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • github.com
    • carbon.compiler-explorer.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Carbon Lang loads about 1.3k tokens when it runs. Until then it costs about 72 tokens; SKILL.md has 341 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~72
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mohitmishra786/low-level-dev-skills at commit bdc5847, republished under its MIT licence (© mohitmishra786). 341 words, ~1,334 tokens.

Download SKILL.mdSave it as .claude/skills/carbon-lang/SKILL.md (or your agent's skills folder).
name
carbon-lang
description
Carbon language skill for C++ interop and toolchain. Use when evaluating Carbon syntax, bidirectional C++ interop, building carbon-toolchain, or comparing Carbon vs C++. Activates on queries about Carbon language, Carbon.h, carbon-toolchain, checked borrows, or C++ successor.

Carbon

Purpose

Guide agents through the Carbon programming language: syntax fundamentals, bidirectional C++ interoperability via Carbon.h, building from source with carbon-toolchain, the experimental memory safety model (checked borrows), current pre-1.0 limitations, and when to evaluate Carbon versus staying on C++.

When to Use

  • Evaluating Carbon for a greenfield project with heavy C++ dependencies
  • Calling C++ libraries from Carbon or exposing Carbon to C++
  • Experimenting with Carbon toolchain from GitHub source
  • Understanding Carbon's migration path from C++ codebases
  • Assessing readiness for production (currently experimental)
  • Comparing Carbon ergonomics to modern C++ (C++20/23)

Workflow

1. Project status awareness
Carbon (2026 state)
├── Experimental — no 1.0 release
├── Focus: C++ interoperability and migration
├── No production stdlib equivalent to C++ yet
└── Toolchain under active development

Use Carbon for exploration and migration prototyping, not production systems without team acceptance of instability.

2. Build carbon-toolchain
bash
git clone https://github.com/carbon-language/carbon-lang
cd carbon-lang

# Prerequisites: LLVM, Clang, CMake, Ninja
./scripts/run_bazelisk.py build \
  //toolchain:install \
  --symlink_prefix=carbon/

# Add to PATH
export PATH="$PWD/carbon/bin:$PATH"

carbon --version
bash
# Online explorer (Compiler Explorer instance)
# http://carbon.compiler-explorer.com/
3. Basic syntax
carbon
package Sample api;

fn Add(a: i32, b: i32) -> i32 {
    return a + b;
}

fn Main() -> i32 {
    var x: i32 = 3;
    var y: i32 = 4;
    Print(ToString(Add(x, y)));
    return 0;
}
CarbonC++ equivalent
fnfunction
var x: i32int32_t x
class / interfaceclass / pure virtual
implmethod definitions
packagenamespace/module
4. C++ interop — calling C++ from Carbon
cpp
// math.h (C++ header)
#pragma once
namespace Math {
    int Add(int a, int b);
}
carbon
// Carbon imports C++ via library directive
package MathInterop api;

import Math;

fn Main() -> i32 {
    var sum: i32 = Math.Add(3, 4);
    return sum;
}

Interop uses Clang to parse C++ headers and generate Carbon bindings.

5. Carbon.h — exposing Carbon to C++
carbon
// Exported for C++ consumption
package MyLib api;

export fn PublicApi() -> i32 {
    return 42;
}
cpp
// C++ side includes generated Carbon headers
#include "carbon/generated/MyLib.h"

int main() {
    return MyLib::PublicApi();
}

Build system links Carbon object files with C++ via the Carbon toolchain driver.

6. Memory safety — checked borrows (experimental)
carbon
// Conceptual — API evolving
fn Process(data: i32*) -> i32 {
    // Checked borrow: compiler tracks lifetime
    var ref: i32* = data;
    return *ref;
}

Carbon aims for memory safety without garbage collection — checked pointers and ownership semantics. Feature maturity varies; check latest design docs.

7. Current limitations
  • No stable standard library matching C++ <vector>, <thread>, etc.
  • Toolchain APIs change between releases
  • IDE support limited compared to C++/Rust
  • Cross-compilation story immature
  • Community and package ecosystem small
8. Carbon vs C++ decision tree
Choose Carbon exploration when
├── Large C++ codebase to gradually migrate
├── Team wants improved syntax with C++ interop
└── Can tolerate toolchain churn

Stay on C++ when
├── Production stability required now
├── Need full stdlib, Boost, mature tooling
├── Heavy template metaprogramming investment
└── Platform support beyond Carbon targets
9. Build a Carbon file
bash
# Compile and link (toolchain evolving — check docs)
carbon compile sample.carbon --output=sample.o
carbon link sample.o --output=sample

# Typecheck only
carbon compile --phase=check sample.carbon

# Or build from source with Bazel in carbon-lang repo
./scripts/run_bazelisk.py build //toolchain:install --symlink_prefix=carbon/

Common Problems

SymptomCauseFix
Build fails missing LLVMWrong LLVM versionMatch carbon-lang README LLVM pin
C++ import errorsUnsupported C++ featuresSimplify header; wrap in C API
Syntax changed since tutorialPre-1.0 churnCheck latest carbon-lang docs
No stdlib for taskNot implementedBridge to C++ library temporarily
Explorer differs from CLIDifferent versionsUse same commit for both
Link error with C++ABI mismatchUse Carbon toolchain link driver
  • skills/compilers/cpp-templates — C++ being migrated from
  • skills/compilers/cpp-modules — C++20 modules comparison
  • skills/compiler-internals/compiler-frontend — Carbon compiler architecture
  • skills/languages/hare-lang — alternative systems language
  • skills/compilers/clang — Clang backend for Carbon
  • skills/compilers/llvm — LLVM IR pipeline

© mohitmishra786, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/languages/carbon-lang of mohitmishra786/low-level-dev-skills.

Open the folder on GitHubat commit bdc5847

Compare with similar skills

Carbon Lang next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Carbon Lang compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Carbon Lang this skillmohitmishra786/low-level-dev-skills252—~1.3kAutomated safety check: PassMIT
Paddle BuildPaddlePaddle/Paddle24k—~1kAutomated safety check: PassApache-2.0
Fory Releaseapache/fory4.6k—~2.9kAutomated safety check: PassApache-2.0
ONNX Runtime Shape Inference Safety Auditmicrosoft/onnxruntime22k—~3.3kAutomated safety check: PassMIT
Code Audit3stoneBrother/code-audit8921 repos~2.7kAutomated safety check: PassNone
Leetcuda Tex To Readthedocsxlite-dev/LeetCUDA12k—~902Automated safety check: PassGPL-3.0

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Works with

Questions about Carbon Lang

What does Carbon Lang do?

Carbon language skill for C++ interop and toolchain. An agent skill from mohitmishra786/low-level-dev-skills. Carbon Lang is an agent skill from mohitmishra786/low-level-dev-skills. Carbon language skill for C++ interop and toolchain.

When should I use Carbon Lang?

Carbon Lang fits situations like: evaluating Carbon syntax; bidirectional C++ interop; building carbon-toolchain; comparing Carbon vs C++.

How do I install Carbon Lang in Claude Code?

Run `npx skills add mohitmishra786/low-level-dev-skills --skill carbon-lang -a claude-code`. Or copy the skill folder (skills/languages/carbon-lang in mohitmishra786/low-level-dev-skills) into .claude/skills/carbon-lang in your project. Claude Code loads it when a task matches its description.

How do I install Carbon Lang in Codex?

Run `npx skills add mohitmishra786/low-level-dev-skills --skill carbon-lang -a codex`. Or copy the skill folder (skills/languages/carbon-lang in mohitmishra786/low-level-dev-skills) into .agents/skills/carbon-lang in your project. Codex loads it when a task matches its description.

Can I use Carbon Lang in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mohitmishra786/low-level-dev-skills --skill carbon-lang -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/carbon-lang, .gemini/skills/carbon-lang, .github/skills/carbon-lang and .opencode/skills/carbon-lang in your project.

What does Carbon Lang need to run?

Going by SKILL.md and its folder, Carbon Lang needs the command-line tools its instructions call (git).

Does Carbon Lang access the network?

SKILL.md names 2 domains. In commands or code: github.com and carbon.compiler-explorer.com; the agent is likely to contact these when it follows the instructions. This is read from the text; nothing was executed.

Is Carbon Lang safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Carbon Lang use?

Carbon Lang is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Carbon Lang use?

About 1.3k tokens (SKILL.md is roughly 5.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Carbon Lang?

Skills that share tags, products or a category with Carbon Lang: Paddle Build (PaddlePaddle/Paddle, 24k stars), Fory Release (apache/fory, 4.6k stars), ONNX Runtime Shape Inference Safety Audit (microsoft/onnxruntime, 22k stars) and Code Audit (3stoneBrother/code-audit, 892 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Carbon Lang?

mohitmishra786 (a GitHub user) maintains it in mohitmishra786/low-level-dev-skills, which has 252 GitHub stars. The repository holds 138 skills in this directory. The repository was last updated on June 27, 2026.

Source: mohitmishra786/low-level-dev-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.