Code Maturity Assessor
Trail of BitsOfficialPublished by Trail of Bits
- Skill
- Review and audit
- Security
- CC-BY-SA-4.0
- No issues found
AutoGineer summary
Written by AutoGineer from the skill’s own files, not by the author
The Code Maturity Assessor provides a structured, evidence-based evaluation of blockchain projects using a 9-category framework. It guides users through a discovery and analysis phase, examining aspects such as arithmetic safety, access controls, decentralization, and testing. The skill produces a comprehensive scorecard and a priority-ordered roadmap to help developers and auditors identify critical gaps and improve the overall maturity of their smart contract systems.
What it does
- Evaluates codebases across 9 specific security and maturity categories.
- Provides evidence-based ratings from Missing to Strong.
- Generates a detailed maturity scorecard with file-level references.
- Creates a priority-ordered improvement roadmap with effort estimates.
- Conducts an interactive assessment to clarify off-chain processes.
- Delivers an executive summary highlighting project strengths and critical gaps.
When to use it
- When auditing the security and operational maturity of a smart contract project.
- When preparing a codebase for a formal security review.
- When you need to justify architectural improvements to stakeholders.
- When assessing the readiness of a decentralized application for mainnet deployment.
Advantages
- Standardized evaluation based on established industry frameworks.
- Reduces subjectivity by requiring concrete evidence for every rating.
- Actionable output that translates findings into a clear development roadmap.
- Covers both on-chain code and off-chain operational practices.
Usage examples
- “Assess the maturity of my DeFi protocol codebase located in the current directory.”
- The agent will scan the files, analyze the 9 categories, ask questions about your incident response and monitoring, and generate a maturity report.
- “Evaluate my NFT contract against the 9-category maturity framework.”
- The agent will provide a scorecard and a roadmap detailing necessary improvements for arithmetic safety, access control, and testing.
Install
Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/trailofbits/code-maturity-assessor/downloadUnzip it into the cross-client skills folder of your project:
mkdir -p .agents/skills && unzip code-maturity-assessor.zip -d .agents/skills
Documentation by Trail of Bits
Code Maturity Assessor
Purpose
Systematically assesses codebase maturity using Trail of Bits' 9-category framework. Provides evidence-based ratings and actionable recommendations.
Framework: Building Secure Contracts - Code Maturity Evaluation v0.1.0
How This Works
Phase 1: Discovery
Explores the codebase to understand:
Project structure and platform
Contract/module files
Test coverage
Documentation availability
Phase 2: Analysis
For each of 9 categories, I'll:
Search the code for relevant patterns
Read key files to assess implementation
Present findings with file references
Ask clarifying questions about processes I can't see in code
Determine rating based on criteria
Phase 3: Report
Generates:
Executive summary
Maturity scorecard (ratings for all 9 categories)
Detailed analysis with evidence
Priority-ordered improvement roadmap
Rating System
Missing (0): Not present/not implemented
Weak (1): Several significant improvements needed
Moderate (2): Adequate, can be improved
Satisfactory (3): Above average, minor improvements
Strong (4): Exceptional, only small improvements possible
Rating Logic:
ANY "Weak" criteria → Weak
NO "Weak" + SOME "Moderate" unmet → Moderate
ALL "Moderate" + SOME "Satisfactory" met → Satisfactory
ALL "Satisfactory" + exceptional practices → Strong
The 9 Categories
I assess 9 comprehensive categories covering all aspects of code maturity. For detailed criteria, analysis approaches, and rating thresholds, see ASSESSMENT_CRITERIA.md.
Quick Reference:
1. ARITHMETIC
Overflow protection mechanisms
Precision handling and rounding
Formula specifications
Edge case testing
2. AUDITING
Event definitions and coverage
Monitoring infrastructure
Incident response planning
3. AUTHENTICATION / ACCESS CONTROLS
Privilege management
Role separation
Access control testing
Key compromise scenarios
4. COMPLEXITY MANAGEMENT
Function scope and clarity
Cyclomatic complexity
Inheritance hierarchies
Code duplication
5. DECENTRALIZATION
Centralization risks
Upgrade control mechanisms
User opt-out paths
Timelock/multisig patterns
6. DOCUMENTATION
Specifications and architecture
Inline code documentation
User stories
Domain glossaries
7. TRANSACTION ORDERING RISKS
MEV vulnerabilities
Front-running protections
Slippage controls
Oracle security
8. LOW-LEVEL MANIPULATION
Assembly usage
Unsafe code sections
Low-level calls
Justification and testing
9. TESTING & VERIFICATION
Test coverage
Fuzzing and formal verification
CI/CD integration
Test quality
For complete assessment criteria including what I'll analyze, what I'll ask you, and detailed rating thresholds (WEAK/MODERATE/SATISFACTORY/STRONG), see ASSESSMENT_CRITERIA.md.
Example Output
When the assessment is complete, you'll receive a comprehensive maturity report including:
Executive Summary: Overall score, top 3 strengths, top 3 gaps, priority recommendations
Maturity Scorecard: Table with all 9 categories rated with scores and notes
Detailed Analysis: Category-by-category breakdown with evidence (file:line references)
Improvement Roadmap: Priority-ordered recommendations (CRITICAL/HIGH/MEDIUM) with effort estimates
For a complete example assessment report, see EXAMPLE_REPORT.md.
Assessment Process
When invoked, I will:
Explore codebase
Find contract/module files
Identify test files
Locate documentation
Analyze each category
Search for relevant code patterns
Read key implementations
Assess against criteria
Collect evidence
Interactive assessment
Present my findings with file references
Ask about processes I can't see in code
Discuss borderline cases
Determine ratings together
Generate report
Executive summary
Maturity scorecard table
Detailed category analysis with evidence
Priority-ordered improvement roadmap
Rationalizations (Do Not Skip)
| Rationalization | Why It's Wrong | Required Action |
|---|---|---|
| "Found some findings, assessment complete" | Assessment requires evaluating ALL 9 categories | Complete assessment of all 9 categories with evidence for each |
| "I see events, auditing category looks good" | Events alone don't equal auditing maturity | Check logging comprehensiveness, testing, incident response processes |
| "Code looks simple, complexity is low" | Visual simplicity masks composition complexity | Analyze cyclomatic complexity, dependency depth, state machine transitions |
| "Not a DeFi protocol, MEV category doesn't apply" | MEV extends beyond DeFi (governance, NFTs, games) | Verify with transaction ordering analysis before declaring N/A |
| "No assembly found, low-level category is N/A" | Low-level risks include external calls, delegatecall, inline assembly | Search for all low-level patterns before skipping category |
| "This is taking too long" | Thorough assessment requires time per category | Complete all 9 categories, ask clarifying questions about off-chain processes |
| "I can rate this without evidence" | Ratings without file:line references = unsubstantiated claims | Collect concrete code evidence for every category assessment |
| "User will know what to improve" | Vague guidance = no action | Provide priority-ordered roadmap with specific improvements and effort estimates |
Report Format
For detailed report structure and templates, see REPORT_FORMAT.md.
Structure:
Executive Summary
Project name and platform
Overall maturity (average rating)
Top 3 strengths
Top 3 critical gaps
Priority recommendations
Maturity Scorecard
Table with all 9 categories
Ratings and scores
Key findings notes
Detailed Analysis
Per-category breakdown
Evidence with file:line references
Gaps and improvement actions
Improvement Roadmap
CRITICAL (immediate)
HIGH (1-2 months)
MEDIUM (2-4 months)
Effort estimates and impact
Ready to Begin
Estimated Time: 30-40 minutes
I'll need:
Access to full codebase
Your knowledge of processes (monitoring, incident response, team practices)
Context about the project (DeFi, NFT, infrastructure, etc.)
Let's assess this codebase!
Files
- ATTRIBUTION.mdAdded by AutoGineer963 B
- LICENSELicence file added by AutoGineer19.7 KiB
- SKILL.md7.1 KiB
- agents/openai.yaml242 B
- assets/trail-of-bits-mark.svg3.0 KiB
- resources/ASSESSMENT_CRITERIA.md9.6 KiB
- resources/EXAMPLE_REPORT.md7.4 KiB
- resources/REPORT_FORMAT.md726 B
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Requirements and compatibility
Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta
“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.
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Attribution and licence
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- trailofbits/skills · plugins/building-secure-contracts/skills/code-maturity-assessor · commit e4dd0bb
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- LICENSE (added by AutoGineer from LICENSE)
- ATTRIBUTION.md (written by AutoGineer)
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