{"slug":"trailofbits-differential-review","name":"differential-review","description":"Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it.","long_description":"---\nname: differential-review\ndescription: \"Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it.\"\nallowed-tools: Read Write Grep Glob Bash\n---\n\n# Differential Security Review\n\nSecurity-focused code review for PRs, commits, and diffs.\n\n## Core Principles\n\n1. **Risk-First**: Focus on auth, crypto, value transfer, external calls\n2. **Evidence-Based**: Every finding backed by git history, line numbers, attack scenarios\n3. **Adaptive**: Scale to codebase size (SMALL/MEDIUM/LARGE)\n4. **Honest**: Explicitly state coverage limits and confidence level\n5. **Output-Driven**: Always generate comprehensive markdown report file\n\n---\n\n## Rationalizations (Do Not Skip)\n\n| Rationalization | Why It's Wrong | Required Action |\n|-----------------|----------------|-----------------|\n| \"Small PR, quick review\" | Heartbleed was 2 lines | Classify by RISK, not size |\n| \"I know this codebase\" | Familiarity breeds blind spots | Build explicit baseline context |\n| \"Git history takes too long\" | History reveals regressions | Never skip Phase 1 |\n| \"Blast radius is obvious\" | You'll miss transitive callers | Calculate quantitatively |\n| \"No tests = not my problem\" | Missing tests = elevated risk rating | Flag in report, elevate severity |\n| \"Just a refactor, no security impact\" | Refactors break invariants | Analyze as HIGH until proven LOW |\n| \"I'll explain verbally\" | No artifact = findings lost | Always write report |\n\n---\n\n## Quick Reference\n\n### Codebase Size Strategy\n\n| Codebase Size | Strategy | Approach |\n|---------------|----------|----------|\n| SMALL (<20 files) | DEEP | Read all deps, full git blame |\n| MEDIUM (20-200) | FOCUSED | 1-hop deps, priority files |\n| LARGE (200+) | SURGICAL | Critical paths only |\n\n### Risk Level Triggers\n\n| Risk Level | Triggers |\n|------------|----------|\n| HIGH | Auth, crypto, external calls, value transfer, validation removal |\n| MEDIUM | Business logic, state changes, new public APIs |\n| LOW | Comments, tests, UI, logging |\n\n---\n\n## Workflow Overview\n\n```\nPre-Analysis → Phase 0: Triage → Phase 1: Code Analysis → Phase 2: Test Coverage\n    ↓              ↓                    ↓                        ↓\nPhase 3: Blast Radius → Phase 4: Deep Context → Phase 5: Adversarial → Phase 6: Report\n```\n\n---\n\n## Decision Tree\n\n**Starting a review?**\n\n```\n├─ Need detailed phase-by-phase methodology?\n│  └─ Read: methodology.md\n│     (Pre-Analysis + Phases 0-4: triage, code analysis, test coverage, blast radius)\n│\n├─ Analyzing HIGH RISK change?\n│  ├─ Read: adversarial.md\n│  │  (Phase 5: Attacker modeling, exploit scenarios, exploitability rating)\n│  └─ Or delegate to: differential-review:adversarial-modeler agent\n│     (Autonomous attacker modeling with concrete exploit scenarios)\n│\n├─ Writing the final report?\n│  └─ Read: reporting.md\n│     (Phase 6: Report structure, templates, formatting guidelines)\n│\n├─ Looking for specific vulnerability patterns?\n│  └─ Read: patterns.md\n│     (Regressions, reentrancy, access control, overflow, etc.)\n│\n└─ Quick triage only?\n   └─ Use Quick Reference above, skip detailed docs\n```\n\n---\n\n## Agents\n\n**`differential-review:adversarial-modeler`** — Models attacker perspectives and\nbuilds exploit scenarios for HIGH RISK code changes. Follows the 5-step\nadversarial methodology (attacker model, attack vectors, exploitability rating,\nexploit scenario, baseline cross-reference) and produces structured vulnerability\nreports. Delegate to this agent when Phase 5 analysis is needed on high-risk\nchanges, passing that full namespaced name as `subagent_type` — a bare\n`adversarial-modeler` is unregistered and the dispatch fails at runtime.\n\n---\n\n## Quality Checklist\n\nBefore delivering:\n\n- [ ] All changed files analyzed\n- [ ] Git blame on removed security code\n- [ ] Blast radius calculated for HIGH risk\n- [ ] Attack scenarios are concrete (not generic)\n- [ ] Findings reference specific line numbers + commits\n- [ ] Report file generated\n- [ ] User notified with summary\n\n---\n\n## Integration\n\n**audit-context-building skill:**\n- Pre-Analysis: Build baseline context\n- Phase 4: Deep context on HIGH RISK changes\n\n**issue-writer skill:**\n- Transform findings into formal audit reports\n- Command: `issue-writer --input DIFFERENTIAL_REVIEW_REPORT.md --format audit-report`\n\n---\n\n## Example Usage\n\n### Quick Triage (Small PR)\n```\nInput: 5 file PR, 2 HIGH RISK files\nStrategy: Use Quick Reference\n1. Classify risk level per file (2 HIGH, 3 LOW)\n2. Focus on 2 HIGH files only\n3. Git blame removed code\n4. Generate minimal report\nTime: ~30 minutes\n```\n\n### Standard Review (Medium Codebase)\n```\nInput: 80 files, 12 HIGH RISK changes\nStrategy: FOCUSED (see methodology.md)\n1. Full workflow on HIGH RISK files\n2. Surface scan on MEDIUM\n3. Skip LOW risk files\n4. Complete report with all sections\nTime: ~3-4 hours\n```\n\n### Deep Audit (Large, Critical Change)\n```\nInput: 450 files, auth system rewrite\nStrategy: SURGICAL + audit-context-building\n1. Baseline context with audit-context-building\n2. Deep analysis on auth changes only\n3. Blast radius analysis\n4. Adversarial modeling\n5. Comprehensive report\nTime: ~6-8 hours\n```\n\n---\n\n## When NOT to Use This Skill\n\n- **Greenfield code** (no baseline to compare)\n- **Documentation-only changes** (no security impact)\n- **Formatting/linting** (cosmetic changes)\n- **User explicitly requests quick summary only** (they accept risk)\n\nFor these cases, use standard code review instead.\n\n---\n\n## Red Flags (Stop and Investigate)\n\n**Immediate escalation triggers:**\n- Removed code from \"security\", \"CVE\", or \"fix\" commits\n- Access control modifiers removed (onlyOwner, internal → external)\n- Validation removed without replacement\n- External calls added without checks\n- High blast radius (50+ callers) + HIGH risk change\n\nThese patterns require adversarial analysis even in quick triage.\n\n---\n\n## Tips for Best Results\n\n**Do:**\n- Start with git blame for removed code\n- Calculate blast radius early to prioritize\n- Generate concrete attack scenarios\n- Reference specific line numbers and commits\n- Be honest about coverage limitations\n- Always generate the output file\n\n**Don't:**\n- Skip git history analysis\n- Make generic findings without evidence\n- Claim full analysis when time-limited\n- Forget to check test coverage\n- Miss high blast radius changes\n- Output report only to chat (file required)\n\n---\n\n## Supporting Documentation\n\n- **[methodology.md](methodology.md)** - Detailed phase-by-phase workflow (Phases 0-4)\n- **[adversarial.md](adversarial.md)** - Attacker modeling and exploit scenarios (Phase 5)\n- **[reporting.md](reporting.md)** - Report structure and formatting (Phase 6)\n- **[patterns.md](patterns.md)** - Common vulnerability patterns reference\n\n---\n\n**For first-time users:** Start with [methodology.md](methodology.md) to understand the complete workflow.\n\n**For experienced users:** Use this page's Quick Reference and Decision Tree to navigate directly to needed content.\n","tagline":"Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit,","category":"security","tags":["agent-skill"],"author":"trailofbits","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"recursive skill source sync","sourceDetail":"trailofbits/skills","creatorName":"trailofbits","creatorUrl":"https://github.com/trailofbits","sourceUrl":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/trailofbits-differential-review#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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require human review before any live investment decision.","Quality score needs review"],"backward_compatible":{"trust_score_v4":{"version":"trust-score-v4","score":83,"tier":"strong","label":"Strong shortlist","summary":"Good trust signals with a few areas worth checking before rollout."}}},"trust_score_v4":{"version":"trust-score-v4","score":83,"tier":"strong","label":"Strong shortlist","summary":"Good trust signals with a few areas worth checking before rollout.","recommendedAction":"Test in a sandbox workflow and compare its install path with close alternatives.","dimensions":[{"id":"github_adoption","label":"GitHub adoption","score":94,"weight":0.13,"status":"pass","detail":"6.9K GitHub stars"},{"id":"repo_activity","label":"Stars/forks activity","score":88,"weight":0.08,"status":"pass","detail":"6.9K stars, 590 forks; issue activity unavailable in current metadata"},{"id":"maintenance","label":"Recent maintenance","score":100,"weight":0.14,"status":"pass","detail":"11d since push"},{"id":"license","label":"License clarity","score":86,"weight":0.09,"status":"pass","detail":"CC-BY-SA-4.0"},{"id":"documentation","label":"README/SKILL.md completeness","score":86,"weight":0.14,"status":"pass","detail":"Metadata includes enough usage and workflow context"},{"id":"dependency_risk","label":"Dependency/runtime risk","score":72,"weight":0.12,"status":"info","detail":"command execution surface"},{"id":"installability","label":"Install availability","score":92,"weight":0.1,"status":"pass","detail":"npx skills add trailofbits/skills --skill differential-review"},{"id":"install_safety","label":"Install command safety","score":92,"weight":0.1,"status":"pass","detail":"standard package or runtime install path"},{"id":"permission_surface","label":"Permission surface","score":62,"weight":0.07,"status":"info","detail":"shell or command execution, filesystem or document access"},{"id":"repository","label":"Repository evidence","score":86,"weight":0.04,"status":"pass","detail":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review"},{"id":"review_status","label":"Review status","score":88,"weight":0.05,"status":"pass","detail":"AI review data available"},{"id":"agent_outcomes","label":"Agent Proven outcomes","score":54,"weight":0.13,"status":"info","detail":"No agent outcome data yet"}],"checks":[{"status":"pass","label":"GitHub adoption","detail":"6.9K GitHub stars"},{"status":"pass","label":"Stars/forks activity","detail":"6.9K stars, 590 forks; issue activity unavailable in current metadata"},{"status":"pass","label":"Recent maintenance","detail":"11d since push"},{"status":"pass","label":"License clarity","detail":"CC-BY-SA-4.0"},{"status":"pass","label":"README/SKILL.md completeness","detail":"Metadata includes enough usage and workflow context"},{"status":"info","label":"Dependency/runtime risk","detail":"command execution surface"},{"status":"pass","label":"Install availability","detail":"npx skills add trailofbits/skills --skill differential-review"},{"status":"pass","label":"Install command safety","detail":"standard package or runtime install path"},{"status":"info","label":"Permission surface","detail":"shell or command execution, filesystem or document access"},{"status":"pass","label":"Repository evidence","detail":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review"},{"status":"pass","label":"Review status","detail":"AI review data available"},{"status":"info","label":"Agent Proven outcomes","detail":"No agent outcome data yet"},{"status":"warn","label":"Ownership","detail":"No approved owner claim yet"},{"status":"pass","label":"OpenAgentSkill usage","detail":"4 views, 0 install copies"},{"status":"info","label":"Agent outcomes","detail":"No agent outcome data yet"}],"strengths":["AI review approved","Install path is available","Repository evidence is available","Recently maintained repository","Large GitHub adoption signal","Install command has no obvious high-risk pattern"],"warnings":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"],"evidence":{"stars":"6.9K GitHub stars","repoActivity":"6.9K stars, 590 forks","lastPushed":"11d since push","license":"CC-BY-SA-4.0","repository":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review","install":"npx skills add trailofbits/skills --skill differential-review","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"},"installReadiness":{"ready":true,"command":"npx skills add trailofbits/skills --skill differential-review","policy":"human_review_before_install","label":"Human review before install","notes":["Install path is available","Repository evidence is available","License is declared","No Agent Proven outcome evidence yet","11d since push","Financial domain: human review is required before use in a live investment workflow."]},"agentCompatibility":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"riskSummary":{"level":"medium","label":"Review before production","notes":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"outcomeEvidence":{"total":0,"successes":0,"failures":0,"notRelevant":0,"successRate":null,"installAttempts":0,"riskBlocked":0,"setupRequired":0,"installSuccessRate":null,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"recentSuccessRate":null,"recentFailureRate":null,"uniqueAgents":0,"agentProvenScore":0,"agentProvenLabel":"Needs first agent run","lastOutcomeAt":null,"label":"No agent outcome data yet"},"autoInstall":{"allowed":false,"sandboxRequired":true,"policy":"human_review_before_install","reason":"Human review or sandbox validation is required before automatic installation."},"bestFor":["security","agent-skill"],"doNotUseFor":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"knownRisks":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"outcome_stats":null,"safety":{"score":47,"level":"avoid_auto_install","label":"Avoid automatic install","safety_tier":{"tier":"experimental","label":"Experimental","badge":"EXPERIMENTAL","summary":"Sparse or mixed signals. Useful for discovery, but not for autonomous installation.","recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","auto_install_policy":"review","reasons":["Metadata combines secrets access with shell or command execution","High-risk permission hints: Shell or command execution, Secrets or environment access","47/100 agent safety score"]},"auto_install_allowed":false,"human_review_required":true,"blocked":false,"audit_risk":"needs_review","permission_hints":[{"id":"shell","label":"Shell or command execution","reason":"Skill metadata references terminal, CLI, shell, subprocess, or command execution workflows.","severity":"high"},{"id":"network","label":"Network access","reason":"Skill likely fetches remote pages, APIs, repositories, or external services.","severity":"medium"},{"id":"filesystem","label":"Filesystem access","reason":"Skill may read or write project files, documents, generated artifacts, or local workspace state.","severity":"medium"},{"id":"secrets","label":"Secrets or environment access","reason":"Skill metadata references credentials, tokens, environment variables, or secret-bearing workflows.","severity":"high"}],"policy_warnings":["High-risk permission hints: Shell or command execution, Secrets or environment access","Financial research output is not financial advice; require human review before any live investment decision"],"constraints_applied":{"max_risk":"medium","needs_install_command":true,"min_stars":0}},"safety_gate":{"tier":"experimental","label":"Experimental","badge":"EXPERIMENTAL","auto_install_policy":"review","auto_install_allowed":false,"blocked":false,"human_review_required":true,"recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","reasons":["Metadata combines secrets access with shell or command execution","High-risk permission hints: Shell or command execution, Secrets or environment access","47/100 agent safety score"]},"eval":{"version":"openagentskill-skill-eval-v1","status":"review","score":78,"risk_level":"medium","decision":{"recommendation":"manual_review","reason":"Test manually in an isolated workspace and compare against safer alternatives.","auto_install_allowed":false,"policy":"review","human_review_required":true},"blockers":[],"warnings":["Audit score: Needs review","Agent safety gate: Sparse or mixed signals. Useful for discovery, but not for autonomous installation.","Permission surface: shell or command execution, filesystem or document access","High-risk permission hints: Shell or command execution, Secrets or environment access","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"],"validation_plan":["Inspect repository, README/SKILL.md, license, and recent commits before production use.","Install in an isolated workspace or sandbox with no production secrets available.","Run the smallest representative task and record files touched, commands run, network access, and outputs.","Compare the selected skill against at least one alternative when the eval status is review or failed.","Promote only after the agent reports a successful verification result and unresolved warnings are accepted."],"checks":[{"id":"task_fit","label":"Task fit","status":"pass","score":94,"required_for_auto_install":true,"detail":"Task wording matches this skill metadata.","evidence":["Evaluate differential-review before installing it in an agent workflow","security","Research agents workflows; Claude Code teams; teams that value GitHub adoption signals"]},{"id":"install_path","label":"Install path","status":"pass","score":92,"required_for_auto_install":true,"detail":"Install handoff is available.","evidence":["npx skills add trailofbits/skills --skill differential-review"]},{"id":"install_safety","label":"Install command safety","status":"pass","score":92,"required_for_auto_install":true,"detail":"standard package or runtime install path","evidence":["npx skills add trailofbits/skills --skill differential-review"]},{"id":"trust_score","label":"Trust score","status":"pass","score":83,"required_for_auto_install":true,"detail":"Good trust signals with a few areas worth checking before rollout.","evidence":["Strong shortlist","6.9K GitHub stars","CC-BY-SA-4.0"]},{"id":"audit_score","label":"Audit score","status":"warn","score":87,"required_for_auto_install":true,"detail":"Needs review","evidence":["Financial research output is not financial advice; require human review before any live investment decision"]},{"id":"agent_safety_gate","label":"Agent safety gate","status":"warn","score":47,"required_for_auto_install":true,"detail":"Sparse or mixed signals. Useful for discovery, but not for autonomous installation.","evidence":["Test manually in an isolated workspace and compare against safer alternatives.","Metadata combines secrets access with shell or command execution"]},{"id":"readme_skillmd_completeness","label":"README/SKILL.md completeness","status":"pass","score":86,"required_for_auto_install":false,"detail":"Metadata includes enough usage and workflow context","evidence":["Strong README/SKILL.md context"]},{"id":"license_clarity","label":"License clarity","status":"pass","score":86,"required_for_auto_install":true,"detail":"CC-BY-SA-4.0","evidence":["CC-BY-SA-4.0"]},{"id":"recent_maintenance","label":"Recent maintenance","status":"pass","score":100,"required_for_auto_install":false,"detail":"11d since push","evidence":["11d since push"]},{"id":"permission_surface","label":"Permission surface","status":"warn","score":62,"required_for_auto_install":true,"detail":"shell or command execution, filesystem or document access","evidence":["Shell or command execution: high","Network access: medium","Filesystem access: medium"]},{"id":"alternatives","label":"Alternatives available","status":"info","score":55,"required_for_auto_install":false,"detail":"No close alternatives were found in the current shortlist.","evidence":[]}],"endpoints":{"web":"https://www.openagentskill.com/skills/trailofbits-differential-review/evals","api":"/api/agent/evals?slug=trailofbits-differential-review","text":"/api/agent/evals?slug=trailofbits-differential-review&format=text"}},"agent_readable_metadata":{"version":"openagentskill-agent-metadata-v2","skill":{"slug":"trailofbits-differential-review","name":"differential-review","description":"Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it.","category":"security","url":"https://www.openagentskill.com/skills/trailofbits-differential-review","repository":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review","github_repo":"trailofbits/skills"},"suited_tasks":["Research agents workflows","Claude Code teams","teams that value GitHub adoption signals","Search sources","Extract claims","Synthesize findings","Retrieve market data","Compare financial signals"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"],"install":{"command":"npx skills add trailofbits/skills --skill differential-review","ready":true,"targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add trailofbits-differential-review"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"differential-review\" agent skill from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"differential-review\" as a Claude Code skill from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"differential-review\" from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."}],"handoff_url":"https://www.openagentskill.com/api/skills/trailofbits-differential-review/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/trailofbits-differential-review"},"trust":{"score":83,"label":"Strong shortlist","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"6.9K GitHub stars","repoActivity":"6.9K stars, 590 forks","lastPushed":"11d since push","license":"CC-BY-SA-4.0","repository":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review","install":"npx skills add trailofbits/skills --skill differential-review","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"},"outcome_evidence":{"total":0,"successes":0,"failures":0,"not_relevant":0,"success_rate":null,"recent_success_rate":null,"recent_failure_rate":null,"install_attempts":0,"install_success_rate":null,"risk_blocked":0,"setup_required":0,"avg_output_quality":null,"production_outcomes":0,"last_outcome_at":null,"label":"No agent outcome data yet"},"auto_install":{"allowed":false,"sandbox_required":true,"reason":"Human review or sandbox validation is required before automatic installation."},"best_for":["security","agent-skill"],"known_risks":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"audit":{"score":87,"risk_level":"needs_review","risk_label":"Needs review","warnings":["Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"safety_gate":{"tier":"experimental","label":"Experimental","auto_install_policy":"review","auto_install_allowed":false,"human_review_required":true,"blocked":false,"recommended_action":"Test manually in an isolated workspace and compare against safer alternatives."},"quality":{"score":86,"label":"Excellent"},"supply":{"track":"Research and knowledge work","scenario":"Research agents","maintenance":"11d since push","risk":"Needs review"},"alternative_skills":[],"do_not_use_when":["teams that need a vendor-supported SLA","high-compliance environments without internal security review","No major risk signals from current metadata","High-risk permission hints: Shell or command execution, Secrets or environment access","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Production credentials, payments, or irreversible account changes without explicit human review"],"agent_contract":{"task_input":"Use differential-review in an agent workflow","recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","install_policy":"review","minimum_review_before_use":["Trust: 83/100 Strong shortlist","Audit: 87/100 Needs review","Safety: 47/100 Avoid automatic install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"trailofbits-differential-review (differential-review)","install_command":"npx skills add trailofbits/skills --skill differential-review","risk_summary":"Needs review; Experimental; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"trailofbits-differential-review","task":"Use differential-review in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/trailofbits-differential-review","api":"https://www.openagentskill.com/api/agent/skills/trailofbits-differential-review","audit":"https://www.openagentskill.com/skills/trailofbits-differential-review/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=trailofbits-differential-review&task=Use%20differential-review%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20differential-review%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20differential-review%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/trailofbits-differential-review/install","manifest":"https://www.openagentskill.com/api/registry/manifest/trailofbits-differential-review"}},"machine_metadata":{"version":"openagentskill-agent-metadata-v2","skill":{"slug":"trailofbits-differential-review","name":"differential-review","description":"Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. 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Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"differential-review\" as a Claude Code skill from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"differential-review\" from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."}],"handoff_url":"https://www.openagentskill.com/api/skills/trailofbits-differential-review/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/trailofbits-differential-review"},"trust":{"score":83,"label":"Strong shortlist","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"6.9K GitHub stars","repoActivity":"6.9K stars, 590 forks","lastPushed":"11d since push","license":"CC-BY-SA-4.0","repository":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review","install":"npx skills add trailofbits/skills --skill differential-review","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"},"outcome_evidence":{"total":0,"successes":0,"failures":0,"not_relevant":0,"success_rate":null,"recent_success_rate":null,"recent_failure_rate":null,"install_attempts":0,"install_success_rate":null,"risk_blocked":0,"setup_required":0,"avg_output_quality":null,"production_outcomes":0,"last_outcome_at":null,"label":"No agent outcome data yet"},"auto_install":{"allowed":false,"sandbox_required":true,"reason":"Human review or sandbox validation is required before automatic installation."},"best_for":["security","agent-skill"],"known_risks":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"audit":{"score":87,"risk_level":"needs_review","risk_label":"Needs review","warnings":["Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"safety_gate":{"tier":"experimental","label":"Experimental","auto_install_policy":"review","auto_install_allowed":false,"human_review_required":true,"blocked":false,"recommended_action":"Test manually in an isolated workspace and compare against safer alternatives."},"quality":{"score":86,"label":"Excellent"},"supply":{"track":"Research and knowledge work","scenario":"Research agents","maintenance":"11d since push","risk":"Needs review"},"alternative_skills":[],"do_not_use_when":["teams that need a vendor-supported SLA","high-compliance environments without internal security review","No major risk signals from current metadata","High-risk permission hints: Shell or command execution, Secrets or environment access","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Production credentials, payments, or irreversible account changes without explicit human review"],"agent_contract":{"task_input":"Use differential-review in an agent workflow","recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","install_policy":"review","minimum_review_before_use":["Trust: 83/100 Strong shortlist","Audit: 87/100 Needs review","Safety: 47/100 Avoid automatic install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"trailofbits-differential-review (differential-review)","install_command":"npx skills add trailofbits/skills --skill differential-review","risk_summary":"Needs review; Experimental; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"trailofbits-differential-review","task":"Use differential-review in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/trailofbits-differential-review","api":"https://www.openagentskill.com/api/agent/skills/trailofbits-differential-review","audit":"https://www.openagentskill.com/skills/trailofbits-differential-review/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=trailofbits-differential-review&task=Use%20differential-review%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20differential-review%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20differential-review%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/trailofbits-differential-review/install","manifest":"https://www.openagentskill.com/api/registry/manifest/trailofbits-differential-review"}},"supply_profile":{"track":{"slug":"research","label":"Research and knowledge work","shortLabel":"Research","description":"Deep research, source comparison, literature review, RAG, knowledge search, and reports."},"scenario":{"label":"Research agents","description":"I need my agent to research a topic, compare sources, and produce a concise report.","useCases":[{"slug":"research-agents","title":"Research agents"},{"slug":"finance-quant","title":"Finance and quant"},{"slug":"github-automation","title":"GitHub automation"}]},"applicableAgents":["Claude Code","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add trailofbits/skills --skill differential-review","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":6876,"starsLabel":"6.9K","forks":590,"license":"CC-BY-SA-4.0","qualityScore":86,"trustScore":83,"auditScore":87},"maintenance":{"status":"fresh","label":"11d since push","daysSincePush":11,"lastPushedAt":"2026-08-27T13:22:01+00:00"},"risk":{"level":"needs_review","label":"Needs review","requiresReview":true,"notes":["Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Needs review"]},"coverageTags":["Research","Research agents","security","agent-skill"]},"audit":{"audit_score":87,"risk_level":"needs_review","risk_label":"Needs review","quality_score":86,"trust_score":83,"maintenance_score":100,"security_score":84,"install_score":92,"warnings":["Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"quality_signals":{"model":"v2","star_score":26.86,"usage_score":0,"review_score":5.55,"metadata_score":3,"freshness_score":15},"platforms":["Claude Code"],"use_cases":[{"slug":"research-agents","title":"Research agents","url":"https://www.openagentskill.com/use-cases/research-agents"},{"slug":"finance-quant","title":"Finance and quant","url":"https://www.openagentskill.com/use-cases/finance-quant"},{"slug":"github-automation","title":"GitHub automation","url":"https://www.openagentskill.com/use-cases/github-automation"},{"slug":"content-automation","title":"Content automation","url":"https://www.openagentskill.com/use-cases/content-automation"}],"stacks":[{"slug":"content-growth-agent","title":"Content growth agent","url":"https://www.openagentskill.com/collections/content-growth-agent"},{"slug":"rag-knowledge-base","title":"RAG knowledge base","url":"https://www.openagentskill.com/collections/rag-knowledge-base"},{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"}],"install":"npx skills add trailofbits/skills --skill differential-review","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add trailofbits-differential-review","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"differential-review\" agent skill from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"differential-review\" as a Claude Code skill from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"differential-review\" from https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"trailofbits-differential-review\",\"task\":\"Install differential-review\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review","github_repo":"trailofbits/skills","version":"1.0.0","license":"CC-BY-SA-4.0","urls":{"web":"https://www.openagentskill.com/skills/trailofbits-differential-review","repository":"https://github.com/trailofbits/skills/tree/main/plugins/differential-review/skills/differential-review","api":"/api/agent/skills/trailofbits-differential-review","install_api":"/api/skills/trailofbits-differential-review/install"},"meta":{"created_at":"2026-08-27T13:25:33.807107+00:00","updated_at":"2026-09-01T11:59:28.941454+00:00","agent_friendly":true}}