C Review

What it does

When your agent uses it

• Auditing native C/C++ applications
• Reviewing daemons
• Services for memory safety
• Hunting integer overflow / use-after-free / race conditions in userspace code

Example prompts

• “Use the c-review skill to perform comprehensive C/C++ security review for memory corruption, integer overflows, race conditions, and…”
• “/c-review”

Requirements

• Pre-approved tools (allowed-tools): Workflow, AskUserQuestion, Bash, Read

Workflow steps

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

1. 1Parameters
2. 2Resolve paths
3. 3Run the workflow
4. 4Return the report

What it can do on your machine

Read from SKILL.md and the folder at commit 82fe822. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Workflow
  • AskUserQuestion
  • Bash
  • Read

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • uv

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

• Network

  No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.

  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

C Review loads about 3.3k tokens when it runs. Until then it costs about 82 tokens; SKILL.md has 1,491 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~82

When it runs · the whole SKILL.md, loaded when a task matches

~3.3k

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

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Workflow, AskUserQuestion, Bash, Read

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 trailofbits/skills at commit 82fe822, republished under its CC-BY-SA-4.0 licence (© trailofbits). 1,491 words, ~3,261 tokens.

name

c-review

description

Performs comprehensive C/C++ security review for memory corruption, integer overflows, race conditions, and platform-specific vulnerabilities. Use when auditing native C/C++ applications, reviewing daemons or services for memory safety, or hunting integer overflow / use-after-free / race conditions in userspace code.

allowed-tools

Workflow, AskUserQuestion, Bash, Read

root="${CLAUDE_PLUGIN_ROOT:-}"
if [ -z "$root" ] || [ ! -f "$root/workflows/c-review.js" ]; then
  # Fallback for a cache layout that does not set the variable. ~/.claude ONLY — never `.`:
  # `.` is the AUDITED repository, and a tree that vendors or mirrors this marketplace would
  # win the traversal and run its copy of the scripts, with a different question set and
  # nothing saying which copy ran. Let find's stderr through; a missing ~/.claude is a real
  # failure to report, not noise to hide.
  hit="$(find "$HOME/.claude" -path '*/c-review/workflows/c-review.js' -print -quit)"
  root="${hit%/workflows/c-review.js}"
fi
[ -n "$root" ] && [ -f "$root/workflows/c-review.js" ] && echo "PLUGIN ROOT: $root"

# The workflow cannot call Date.now(), so the timestamp is made here.
output_dir="$(pwd)/.c-review-results/$(date -u +%Y%m%dT%H%M%SZ)"
mkdir -p "$output_dir"; echo "$output_dir"

# A Workflow script has no filesystem APIs, and `assemble_findings.py` resolves `--scope`
# against ITS OWN cwd. Resolve it once here and pass BOTH spellings, or the workflow strips
# `src/` from a finding's path while the assembler strips `/repo/src/`, and the two disagree
# about which findings are duplicates of each other.
scope_abs="$(cd "${scope_subpath:-.}" && pwd)" || echo "scope_subpath does not exist"
echo "$scope_abs"

Workflow({
  scriptPath: "<plugin_root>/workflows/c-review.js",
  args: {
    outputDir:        "<output_dir>",
    pluginRoot:       "<plugin_root>",
    threatModel:      "REMOTE",
    severityFilter:   "all",
    findingScopeRoot: "expat/lib",
    findingScopeRootAbs: "/abs/path/to/repo/expat/lib",
    contextRoots:     ".",
    workerModel:      "sonnet"
  }
})

uv run --no-project <plugin_root>/scripts/assemble_findings.py --run-dir <output_dir> \
  --threat-model <MODEL> --severity-filter <FILTER> --no-judge \
  --scope <finding_scope_root> --context-roots <context_roots> \
  --worker-model <worker_model> \
  --expect <part-stem>=<finding-count>   # one per part the workflow log names

© trailofbits, CC-BY-SA-4.0. 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 plugins/c-review/skills/c-review of trailofbits/skills.

Open the folder on GitHubat commit 82fe822

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in trailofbits/skills, which our catalogue first saw on October 7, 2026.

• majiayu000/claude-skill-registryskills/bash/c-review