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Prepares codebases for security review using Trail of Bits' checklist. Helps set review goals, runs static analysis tools, increases test coverage, removes dead code, ensures accessibility, and genera
The skill file stays in the publisher's repository.
Paste the copied command in a terminal. It installs this SKILL.md into that agent.
npx skills add trailofbits/skills --skill audit-prep-assistant -a cursor -y
Prepares codebases for security review using Trail of Bits' checklist. Helps set review goals, runs static analysis tools, increases test coverage, removes dead code, ensures accessibility, and generates documentation (flowcharts, user stories, inline comments). Use when preparing your own codebase to be audited by someone else, getting a repository review-ready before an external security review, deciding what to fix before auditors start, or asking what assessors need from a project. For understanding unfamiliar code you are about to audit, use audit-context-building instead.
Prepares codebases for security review using Trail of Bits' checklist. Helps set review goals, runs static analysis tools, increases test coverage, removes dead code, ensures accessibility, and generates documentation (flowcharts, user stories, inline comments). Use when preparing your own codebase to be audited by someone else, getting a repository review-ready before an external security review, deciding what to fix before auditors start, or asking what assessors need from a project. For understanding unfamiliar code you are about to audit, use audit-context-building instead.
Helps prepare for a security review using Trail of Bits' checklist. A well-prepared codebase makes the review process smoother and more effective.
Use this: 1-2 weeks before your security audit
Helps define what you want from the review:
Key Questions:
Documents goals to share with the assessment team.
Runs static analysis and helps fix low-hanging fruit:
Run Static Analysis:
For Solidity:
slither . --exclude-dependencies
For Rust:
dylint --all
For Go:
golangci-lint run
For Go/Rust/C++:
# CodeQL and Semgrep checks
Then I'll:
Increase Test Coverage:
Remove Dead Code:
Goal: Clean static analysis report, high test coverage, minimal dead code
Helps make code clear and accessible:
Provide Detailed File List:
Create Build Instructions:
Freeze Stable Version:
Identify Boilerplate:
Helps create documentation:
Flowcharts and Sequence Diagrams:
User Stories:
On-chain/Off-chain Assumptions:
Actors and Privileges:
External Developer Docs:
Function Documentation:
Glossary:
Video Walkthroughs (optional):
When invoked, I will:
Adapts based on:
| Rationalization | Why It's Wrong | Required Action |
|---|---|---|
| "README covers setup, no need for detailed build instructions" | READMEs assume context auditors don't have | Test build on fresh environment, document every dependency version |
| "Static analysis already ran, no need to run again" | Codebase changed since last run | Execute static analysis tools, generate fresh report |
| "Test coverage looks decent" | "Looks decent" isn't measured coverage | Run coverage tools, identify specific untested code paths |
| "Not much dead code to worry about" | Dead code hides during manual review | Use automated detection tools to find unused functions/variables |
| "Architecture is straightforward, no diagrams needed" | Text descriptions miss visual patterns | Generate actual flowcharts and sequence diagrams |
| "Can freeze version right before audit" | Last-minute freezing creates rushed handoff | Identify and document commit hash now, create dedicated branch |
| "Terms are self-explanatory" | Domain knowledge isn't universal | Create comprehensive glossary with all domain-specific terms |
| "I'll do this step later" | Steps build on each other - skipping creates gaps | Complete all 4 steps sequentially, track progress with checklist |
When I finish helping you prepare, you'll have concrete deliverables like:
=== AUDIT PREP PACKAGE ===
Project: DeFi DEX Protocol
Audit Date: March 15, 2024
Preparation Status: Complete
---
## REVIEW GOALS DOCUMENT
Security Objectives:
- Verify economic security of liquidity pool swaps
- Validate oracle manipulation resistance
- Assess flash loan attack vectors
Areas of Concern:
1. Complex AMM pricing calculation (src/SwapRouter.sol:89-156)
2. Multi-hop swap routing logic (src/Router.sol)
3. Oracle price aggregation (src/PriceOracle.sol:45-78)
Worst-Case Scenario:
- Flash loan attack drains liquidity pools via oracle manipulation
Questions for Auditors:
- Can the AMM pricing model produce negative slippage under edge cases?
- Is the slippage protection sufficient to prevent sandwich attacks?
- How resilient is the system to temporary oracle failures?
---
## STATIC ANALYSIS REPORT
Slither Scan Results:
✓ High: 0 issues
✓ Medium: 0 issues
⚠ Low: 2 issues (triaged - documented in TRIAGE.md)
ℹ Info: 5 issues (code style, acceptable)
Tool: slither . --exclude-dependencies
Date: March 1, 2024
Status: CLEAN (all critical issues resolved)
---
## TEST COVERAGE REPORT
Overall Coverage: 94%
- Statements: 1,245 / 1,321 (94%)
- Branches: 456 / 498 (92%)
- Functions: 89 / 92 (97%)
Uncovered Areas:
- Emergency pause admin functions (tested manually)
- Governance migration path (one-time use)
Command: forge coverage
Status: EXCELLENT
---
## CODE SCOPE
In-Scope Files (8):
✓ src/SwapRouter.sol (456 lines)
✓ src/LiquidityPool.sol (234 lines)
✓ src/PairFactory.sol (389 lines)
✓ src/PriceOracle.sol (167 lines)
✓ src/LiquidityManager.sol (298 lines)
✓ src/Governance.sol (201 lines)
✓ src/FlashLoan.sol (145 lines)
✓ src/RewardsDistributor.sol (178 lines)
Out-of-Scope:
- lib/ (OpenZeppelin, external dependencies)
- test/ (test contracts)
- scripts/ (deployment scripts)
Total In-Scope: 2,068 lines of Solidity
---
## BUILD INSTRUCTIONS
Prerequisites:
- Foundry 0.2.0+
- Node.js 18+
- Git
Setup:
```bash
git clone https://github.com/project/repo.git
cd repo
git checkout audit-march-2024 # Frozen branch
forge install
forge build
forge test
Verification: ✓ Build succeeds without errors ✓ All 127 tests pass ✓ No warnings from compiler
Generated Artifacts: ✓ ARCHITECTURE.md - System overview with diagrams ✓ USER_STORIES.md - 12 user interaction flows ✓ GLOSSARY.md - 34 domain terms defined ✓ docs/diagrams/contract-interactions.png ✓ docs/diagrams/swap-flow.png ✓ docs/diagrams/state-machine.png
NatSpec Coverage: 100% of public functions
Network: Ethereum Mainnet Commit: abc123def456 (audit-march-2024 branch) Deployed Contracts:
PACKAGE READY FOR AUDIT ✓ Next Step: Share with Trail of Bits assessment team
---
## What You'll Get
**Review Goals Document**:
- Security objectives
- Areas of concern
- Worst-case scenarios
- Questions for auditors
**Clean Codebase**:
- Triaged static analysis (or clean report)
- High test coverage
- No dead code
- Clear scope
**Accessibility Package**:
- File list with scope
- Build instructions
- Frozen commit/branch
- Boilerplate identified
**Documentation Suite**:
- Flowcharts and diagrams
- User stories
- Architecture docs
- Actor/privilege map
- Inline code comments
- Glossary
- Video walkthroughs (if created)
**Audit Prep Checklist**:
- [ ] Review goals documented
- [ ] Static analysis clean/triaged
- [ ] Test coverage >80%
- [ ] Dead code removed
- [ ] Build instructions verified
- [ ] Stable version frozen
- [ ] Flowcharts created
- [ ] User stories documented
- [ ] Assumptions documented
- [ ] Actors/privileges listed
- [ ] Function docs complete
- [ ] Glossary created
---
## Timeline
**2 weeks before audit**:
- Set review goals
- Run static analysis
- Start fixing issues
**1 week before audit**:
- Increase test coverage
- Remove dead code
- Freeze stable version
- Start documentation
**Few days before audit**:
- Complete documentation
- Verify build instructions
- Create final checklist
- Send package to auditors
---
## Ready to Prep
Let me know when you're ready and I'll help you prepare for your security review!