Code Maturity Assessor

Systematically assess a codebase's maturity using Trail of Bits' 9-category framework.

Purpose

Provide evidence-based ratings and actionable recommendations by analyzing code against established criteria.

Assessment Process

Phase 1: Discovery

Explore the codebase to understand:

• Project structure and platform

• Module/component files

• Test coverage

• Documentation availability

Phase 2: Analysis

For each of 9 categories:

• Search the code for relevant patterns

• Read key files to assess implementation

• Present findings with file references

• Ask clarifying questions about processes not visible in code

• Determine rating based on criteria

Phase 3: Report

Generate:

• Executive summary

• Maturity scorecard (ratings for all 9 categories)

• Detailed analysis with evidence

• Priority-ordered improvement roadmap

Rating System

Rating Score Description

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

1. ARITHMETIC

• Overflow protection mechanisms

• Precision handling and rounding

• Formula specifications

• Edge case testing

2. AUDITING

• Event definitions and coverage

• Logging comprehensiveness

• 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

• Race condition vulnerabilities

• Front-running protections

• Timing-dependent operations

• Oracle security

8. LOW-LEVEL MANIPULATION

• Unsafe code sections

• Low-level calls

• Pointer/memory operations

• Justification and testing

9. TESTING & VERIFICATION

• Test coverage

• Fuzzing and property-based testing

• CI/CD integration

• Test quality and maintainability

Report Structure

1. Executive Summary

• Project name and platform

• Overall maturity (average rating)

• Top 3 strengths

• Top 3 critical gaps

• Priority recommendations

2. Maturity Scorecard

Category Rating Score Notes

Arithmetic Satisfactory 3 Good overflow handling

Auditing Moderate 2 Events present, monitoring gaps

... ... ... ...

3. Detailed Analysis

For each category:

• Evidence with file:line references

• Gaps identified

• Improvement actions

4. Improvement Roadmap

CRITICAL (Immediate)

• Item with effort estimate and impact

HIGH (1-2 months)

• Item with effort estimate and impact

MEDIUM (2-4 months)

• Item with effort estimate and impact

Common Rationalizations (Avoid)

Rationalization Why It's Wrong

"Found some findings, assessment complete" Must evaluate ALL 9 categories

"I see events, auditing looks good" Events alone don't equal maturity

"Code looks simple, complexity is low" Visual simplicity masks composition complexity

"No assembly found, low-level is N/A" Low-level risks include external calls, unsafe blocks

"I can rate without evidence" Ratings without file:line references = unsubstantiated

Estimated Time

30-40 minutes for a full assessment

Requirements

• Access to full codebase

• Knowledge of processes (monitoring, incident response, team practices)

• Context about the project type

Attribution

Based on trailofbits/skills code-maturity-assessor skill.