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audit-prep-assistant — Claude Code skill: what it does, how to install

Prepares codebases for external security reviews using Trail of Bits' checklist. It helps run static analysis, boost test coverage, and generate system documentation.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓
npx skills add trailofbits/skills --skill audit-prep-assistant -a claude-code
Open on GitHub

What audit-prep-assistant does

The skill organizes codebase preparation for an external security audit into four structured steps based on Trail of Bits practices. It starts by defining review goals, high-risk components, and worst-case failure scenarios. Next, it guides static analysis using platform-specific linters: Slither for Solidity, Dylint for Rust, or golangci-lint, CodeQL, and Semgrep for Go and C++. Findings are triaged directly. The assistant then flags dead code and untested logic before assessors receive the repository.

Beyond code hygiene, the assistant demands reproducible builds and clear project boundaries. You must document dependencies with pinned versions, separate boilerplate from proprietary code, and freeze a specific commit hash on a dedicated branch. It also prompts for user stories, sequence diagrams, and domain glossaries. Skipping preparation steps creates gaps. Starting this process one to two weeks before the audit date prevents rushed handoffs.

This skill targets internal preparation. If you need to evaluate an unfamiliar codebase as an auditor, use audit-context-building instead.

What it helps with

  • prepare a repository for an upcoming external security review
  • run static analysis tools like Slither or Dylint and triage warnings
  • remove dead code and locate untested code paths
  • generate architecture diagrams, user stories, and role mappings
  • lock dependencies and verify clean build instructions

Example prompts for the agent

  • Help prepare our Solidity smart contracts for an audit using the Trail of Bits checklist
  • Run static analysis with dylint and find dead code in our Rust repository before review
  • Generate review goals, architecture diagrams, and build instructions for external assessors

How to install audit-prep-assistant

1Skills CLI (Vercel)

npx skills add trailofbits/skills --skill audit-prep-assistant -a claude-code

2Manually: put the files in place

~/.claude/skills/audit-prep-assistant/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/audit-prep-assistant/

From the same set35

The whole set →
semgrep trailofbits Runs a Semgrep static security audit on your codebase. It presents a plan for user confirmation and merges all findings into SARIF. Claude Code CX Codex Cursor +1 9,500installs differential-review trailofbits Reviews code changes for security issues using Git history and test coverage. Use it for commits, diffs, and pull requests that need a written review report. Claude Code CX Codex Cursor +1 8,800installs modern-python trailofbits Configures Python projects with a modern tooling stack: uv for dependency management, ruff for linting and formatting, ty for type checking. Use when starting new projects, writing scripts, or migrating from legacy tools. Claude Code CX Codex Cursor +1 8,700installs secure-workflow-guide trailofbits Guides smart contracts through Trail of Bits' 5-step security audit on check-in or before deployment. It runs static analysis, generates visual charts, and prepares fuzzing tests. Claude Code CX Codex Cursor +1 7,400installs sharp-edges trailofbits Audits API designs and configuration schemas for developer footguns. Flags dangerous defaults and fragile interfaces where the easiest path causes security vulnerabilities. Claude Code CX Codex Cursor +1 6,900installs agentic-actions-auditor trailofbits Inspects GitHub Actions workflows for prompt injection risks and insecure AI agent setups. Catches attacker inputs leaking into prompts via event contexts or environment variables. Claude Code CX Codex Cursor +1 6,700installs gh-cli trailofbits A skill that redirects GitHub requests from curl and fetch to authenticated gh CLI for repositories, pull requests, and issues. Use it for private repos and higher API limits. Claude Code CX Codex Cursor +1 6,600installs variant-analysis trailofbits Finds related occurrences of an already identified defect across a repository. Use it after a vulnerability or logic issue turns up and similar code needs checking. Claude Code CX Codex Cursor +1 6,400installs

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Questions about audit-prep-assistant

How to install audit-prep-assistant in Claude Code?

Run npx skills add trailofbits/skills --skill audit-prep-assistant -a claude-code in your terminal. The skill installs to ~/.claude/skills/audit-prep-assistant/SKILL.md for Claude Code to use.

What does audit-prep-assistant do?

It guides you through preparing a repository for external security assessors. The skill coordinates static analysis runs, helps eliminate dead code, improves test coverage, and creates architectural documentation.

How does audit-prep-assistant differ from audit-context-building?

The audit-prep-assistant skill prepares your own codebase before handing it over to outside reviewers. If you are an auditor trying to understand someone else's unfamiliar repository, use audit-context-building instead.

See also

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