Git History Bug Audit
ben-manes/caffeine
Audits a module by walking its git history commit by commit, tracking unresolved issues forward, and reporting the ones that survive to HEAD as findings.
Security-focused differential code review with blast radius analysis, risk-adaptive depth (DEEP/FOCUSED/SURGICAL), git history correlation, and structured finding format.
Install Differential Review
$ npx skills add vibeeval/vibecosystem --skill differential-review -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install vibeeval/vibecosystem differential-review --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/vibeeval/vibecosystem.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/differential-review .claude/skills/differential-review && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "differential-review" agent skill from https://github.com/vibeeval/vibecosystem/tree/main/skills/differential-review into .claude/skills/differential-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "differential-review", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/vibeeval/vibecosystem/tree/main/skills/differential-reviewType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add vibeeval/vibecosystem --skill differential-review -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install vibeeval/vibecosystem differential-review --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vibeeval/vibecosystem.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/differential-review .agents/skills/differential-review && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "differential-review" agent skill from https://github.com/vibeeval/vibecosystem/tree/main/skills/differential-review into .agents/skills/differential-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "differential-review", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vibeeval/vibecosystem --skill differential-review -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install vibeeval/vibecosystem differential-review --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vibeeval/vibecosystem.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/differential-review .cursor/skills/differential-review && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "differential-review" agent skill from https://github.com/vibeeval/vibecosystem/tree/main/skills/differential-review into .cursor/skills/differential-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "differential-review", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/vibeeval/vibecosystem.git --path skills/differential-review--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add vibeeval/vibecosystem --skill differential-review -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install vibeeval/vibecosystem differential-review --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vibeeval/vibecosystem.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/differential-review .gemini/skills/differential-review && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "differential-review" agent skill from https://github.com/vibeeval/vibecosystem/tree/main/skills/differential-review into .gemini/skills/differential-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "differential-review", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install vibeeval/vibecosystem differential-reviewInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add vibeeval/vibecosystem --skill differential-review -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/vibeeval/vibecosystem.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/differential-review .github/skills/differential-review && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "differential-review" agent skill from https://github.com/vibeeval/vibecosystem/tree/main/skills/differential-review into .github/skills/differential-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "differential-review", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vibeeval/vibecosystem --skill differential-review -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install vibeeval/vibecosystem differential-review --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vibeeval/vibecosystem.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/differential-review .opencode/skills/differential-review && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "differential-review" agent skill from https://github.com/vibeeval/vibecosystem/tree/main/skills/differential-review into .opencode/skills/differential-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "differential-review", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
differential-review- GitHub stars
- 532
- Token cost
- ~1.6k tokens
- SKILL.md length
- 556 words
- Files
- 1
- Skills in repo
- 12
- Repo updated
- First seen
- Licence
- MIT
At a glance
Security-focused differential code review with blast radius analysis, risk-adaptive depth (DEEP/FOCUSED/SURGICAL), git history correlation, and structured finding format.
- Works in 3 steps: Blast Radius Assessment → Git History Correlation → Structured Review
- Code changes for security implications
- SKILL.md covers Review Depth Modes, Review Process, Finding Format and Severity Classification, plus 4 more sections
- Calls git
What it does
Differential Review is an agent skill from vibeeval/vibecosystem. Security-focused differential code review with blast radius analysis, risk-adaptive depth (DEEP/FOCUSED/SURGICAL), git history correlation, and structured finding format. Adapted from Trail of Bits. Use when reviewing PRs, commits, or code changes for security implications.
Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Git workflow and Code review. The repository describes itself as: AI software team for Claude Code - 138 agents, 295 skills, 73 hooks. Self-learning, multi-agent swarm, autonomous skill evolution. The licence is MIT.
When your agent uses it
- Code changes for security implications
- Tasks that involve Git workflow
- Tasks that involve Code review
Example prompts
- “/differential-review”
Workflow steps
3 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 3b763b1. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
git
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
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
Differential Review loads about 1.6k tokens when it runs. Until then it costs about 74 tokens; SKILL.md has 556 words of instructions outside code blocks.
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
Auto-check passed
The automated check found no risky patterns in SKILL.md.
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 vibeeval/vibecosystem at commit 3b763b1, republished under its MIT licence (© vibeeval). 556 words, ~1,578 tokens.
Download SKILL.mdSave it as
.claude/skills/differential-review/SKILL.md (or your agent's skills folder).- name
- differential-review
- description
- Security-focused differential code review with blast radius analysis, risk-adaptive depth (DEEP/FOCUSED/SURGICAL), git history correlation, and structured finding format. Adapted from Trail of Bits. Use when reviewing PRs, commits, or code changes for security implications.
Differential Review
Security-focused code review that adapts depth to codebase size and change risk. Goes beyond style -- finds vulnerabilities, logic errors, and blast radius.
Review Depth Modes
DEEP (Small codebase, < 5K lines changed)
- Line-by-line analysis of every changed file
- Full control flow tracing through changed paths
- Cross-reference every function call to its definition
- Check all error paths and edge cases
FOCUSED (Medium codebase, 5K-50K lines)
- Prioritize files touching auth, crypto, input parsing, state mutation
- Trace data flow from inputs to outputs through changed code
- Skip cosmetic changes (formatting, comments, renames)
- Deep-dive only on security-sensitive paths
SURGICAL (Large codebase, > 50K lines)
- Review only the diff, not surrounding code
- Focus exclusively on: new attack surface, removed security controls, changed trust boundaries
- Flag anything that needs a separate deep review
Review Process
Phase 1: Blast Radius Assessment
Before reading any code:
# What changed?
git diff --stat <base>...<head>
# How much changed?
git diff --shortstat <base>...<head>
# Which files are security-sensitive?
git diff --name-only <base>...<head> | grep -iE '(auth|crypto|token|secret|permission|middleware|validator|sanitiz)'Classify the change:
- Surface area: How many files, functions, modules touched?
- Trust boundary crossing: Does data flow between trust levels?
- Security control modification: Are auth/authz/validation/crypto paths changed?
- Data model change: Are schemas, types, or storage formats modified?
Phase 2: Git History Correlation
Check if the changed code has a history of bugs:
# How often has this file been changed? (churn = risk)
git log --oneline --follow <file> | wc -l
# Were there recent security fixes in this area?
git log --oneline --grep="fix\|vuln\|security\|CVE" -- <file>
# Who else has touched this code?
git log --format='%an' -- <file> | sort | uniq -c | sort -rnHigh churn + security fix history = increase review depth.
Phase 3: Structured Review
For each changed file, analyze in this order:
- Input validation: Are new inputs validated? Are existing validations preserved?
- Authentication/Authorization: Do access controls apply to new code paths?
- Data flow: Can untrusted data reach sensitive operations?
- Error handling: Do error paths leak information or skip cleanup?
- State mutation: Are state changes atomic? Race conditions possible?
- Crypto usage: Correct algorithms, key sizes, modes, IVs?
- Logging: Are sensitive values logged? Are security events NOT logged?
Finding Format
## [SEVERITY] Finding Title
**Location**: file.ts:42-58
**Category**: [Input Validation | Auth | Crypto | Data Flow | State | Logic]
**Confidence**: [HIGH | MEDIUM | LOW]
**Description**:
What the vulnerability is, in one paragraph.
**Impact**:
What an attacker can achieve by exploiting this.
**Proof**:
The specific code path or data flow that demonstrates the issue.
**Recommendation**:
Concrete fix with code example if possible.Severity Classification
| Severity | Criteria | Examples |
|---|---|---|
| CRITICAL | Remote exploitation, no auth required, data breach | SQL injection, auth bypass, RCE |
| HIGH | Requires some access, significant impact | Privilege escalation, IDOR, stored XSS |
| MEDIUM | Limited impact or complex exploitation | Reflected XSS, info disclosure, CSRF |
| LOW | Minimal impact, defense-in-depth | Missing headers, verbose errors, weak config |
| INFO | Best practice, no direct vulnerability | Code quality, missing rate limit, logging gap |
Show full SKILL.md (210 more words)Show less
Rationalizations to Reject
Common excuses that lead to missed findings. Do NOT accept these:
| Rationalization | Why It's Wrong | Required Action |
|---|---|---|
| "It's behind auth" | Auth can be bypassed | Verify auth is enforced AND correct |
| "We trust this input" | Trust boundaries change | Validate at every boundary |
| "It's just internal" | Internal networks get compromised | Apply defense in depth |
| "Nobody would do that" | Attackers do unexpected things | Test the unexpected case |
| "We'll fix it later" | Later never comes in security | Flag it NOW with severity |
| "The framework handles it" | Frameworks have bypasses | Verify the framework actually applies |
| "It's the same as before" | Before might have been wrong too | Review the original if suspicious |
Anti-Hallucination Rules
- Never say "It probably..." -- say "Unclear; need to inspect X"
- Never assume a function is safe without reading its implementation
- Never skip a finding because it seems minor -- document everything
- Every claim must reference a specific file and line number
- If you haven't read the code, say so -- don't infer behavior from names
Diff Review Checklist
[ ] Blast radius assessed (files, trust boundaries, security controls)
[ ] Git history checked for churn and past security fixes
[ ] All new inputs validated
[ ] Auth/authz applied to new endpoints/paths
[ ] Error handling doesn't leak sensitive info
[ ] No hardcoded secrets or credentials
[ ] State mutations are atomic
[ ] Crypto usage follows current best practices
[ ] Logging doesn't include sensitive data
[ ] Removed code didn't contain security controls that are now missing
[ ] Dependencies added/updated are from trusted sources
[ ] Test coverage exists for security-critical pathsIntegration with vibecosystem
- code-reviewer agent: Use this skill for security-focused review depth
- security-reviewer agent: Primary consumer of this skill
- coroner agent: Use blast radius analysis for post-mortem propagation
- /review skill: Automatically applies differential review to PRs
Inspired by Trail of Bits differential-review plugin.
© vibeeval, MIT. 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 skills/differential-review of vibeeval/vibecosystem.
Open the folder on GitHubat commit 3b763b1
Compare with similar skills
Differential Review next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Differential Review this skillvibeeval/vibecosystem | 532 | — | ~1.6k | Automated safety check: Pass | MIT | |
| Git History Bug Auditben-manes/caffeine | 18k | — | ~3.3k | Automated safety check: Pass | Apache-2.0 | |
| Address PR Feedback for ruby-gitruby-git/ruby-git | 1.8k | — | ~657 | Automated safety check: Pass | MIT | |
| PR Review Triagestickerdaniel/linkedin-mcp-server | 3.8k | — | ~1.4k | Automated safety check: Pass | Apache-2.0 | |
| Beyond Compare Git Diff OpenerSensoriumEmbedded/TeensyROM | 227 | — | ~2.4k | Automated safety check: Pass | MIT | |
| GitHub Workflowtransilienceai/communitytools | 563 | — | ~812 | Automated safety check: Notes | MIT |
Similar skills
Address PR Feedback for ruby-git
ruby-git/ruby-git
Addresses unresolved pull request review threads and suppressed (low-confidence) Copilot review comments on the current branch, folds each fix into the…
PR Review Triage
stickerdaniel/linkedin-mcp-server
Collects every review comment on a pull request, checks each against the real code, fixes the valid ones, pushes, and replies on and resolves each thread.
Beyond Compare Git Diff Opener
SensoriumEmbedded/TeensyROM
Opens Beyond Compare on a git diff for the current work, a pull request, a branch, a commit or a range, without touching the checkout.
GitHub Workflow
transilienceai/communitytools
GitHub workflow automation — branching, committing, pushing, pull requests, issues, and code review.
Git CL for Gerrit
webrtc-sdk/webrtc
Provides commands for interacting with Gerrit CLs using git cl, including issue management and non-interactive uploads.
More from vibeeval/vibecosystem
All 12 skills in this repoAgent Benchmark
vibeeval/vibecosystem
Framework for measuring and tracking agent response quality over time.
Factcheck Guard
vibeeval/vibecosystem
A skill your agent uses when making any factual claim about the codebase — existence, absence, or behavior.
Fp Check
vibeeval/vibecosystem
Systematic false positive verification for security findings.
N8n Workflows
vibeeval/vibecosystem
n8n otomasyon workflow'lari. An agent skill from vibeeval/vibecosystem.
Notepad System
vibeeval/vibecosystem
A skill your agent uses when context compression is imminent, when resuming a session, or when preserving critical decisions across long tasks.
Property Based Testing
vibeeval/vibecosystem
Property-based testing (PBT) patterns with fast-check (JS/TS), Hypothesis (Python), and gopter (Go).
Related
Categories
Questions about Differential Review
What does Differential Review do?
Security-focused differential code review with blast radius analysis, risk-adaptive depth (DEEP/FOCUSED/SURGICAL), git history correlation, and structured finding format. Differential Review is an agent skill from vibeeval/vibecosystem. Security-focused differential code review with blast radius analysis, risk-adaptive depth (DEEP/FOCUSED/SURGICAL), git history correlation, and structured finding format.
When should I use Differential Review?
Differential Review fits situations like: code changes for security implications; tasks that involve Git workflow; tasks that involve Code review.
How do I install Differential Review in Claude Code?
Run `npx skills add vibeeval/vibecosystem --skill differential-review -a claude-code`. Or copy the skill folder (skills/differential-review in vibeeval/vibecosystem) into .claude/skills/differential-review in your project. Claude Code loads it when a task matches its description.
How do I install Differential Review in Codex?
Run `npx skills add vibeeval/vibecosystem --skill differential-review -a codex`. Or copy the skill folder (skills/differential-review in vibeeval/vibecosystem) into .agents/skills/differential-review in your project. Codex loads it when a task matches its description.
Can I use Differential Review in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add vibeeval/vibecosystem --skill differential-review -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/differential-review, .gemini/skills/differential-review, .github/skills/differential-review and .opencode/skills/differential-review in your project.
What does Differential Review need to run?
Going by SKILL.md and its folder, Differential Review needs the command-line tools its instructions call (git).
Does Differential Review access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is Differential Review safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Differential Review use?
Differential Review is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Differential Review use?
About 1.6k tokens (SKILL.md is roughly 6.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Differential Review?
Skills that share tags, products or a category with Differential Review: Git History Bug Audit (ben-manes/caffeine, 18k stars), Address PR Feedback for ruby-git (ruby-git/ruby-git, 1.8k stars), PR Review Triage (stickerdaniel/linkedin-mcp-server, 3.8k stars) and Beyond Compare Git Diff Opener (SensoriumEmbedded/TeensyROM, 227 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Differential Review?
vibeeval (a GitHub user) maintains it in vibeeval/vibecosystem, which has 532 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on August 8, 2026.
Source: vibeeval/vibecosystem on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.