Emil Peñaló
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synthesis-code-audit
Systematic 10-dimension quality scan of code diffs, producing scored PASS/WARNING/FAIL verdicts per dimension with a machine-readable overall result. Includes PR review mode for cross-referencing findings against existing reviewer comments. Use when asked to: code audit, audit my
Overview
Systematic 10-dimension quality scan of code diffs, producing scored PASS/WARNING/FAIL verdicts per dimension with a machine-readable overall result. Includes PR review mode for cross-referencing findings against existing reviewer comments. Use when asked to: code audit, audit my changes, quality check, review the diff, check this code, audit my code, scan for issues, code quality scan, diff review.
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Synthesis Code Audit
A code audit is a systematic quality measurement of a diff. It is not a judgment call about whether a change should merge — that is the reviewer's job (see synthesis-pr-review). An audit produces a scored report across 10 orthogonal dimensions, each graded independently. The report tells you where the quality problems are; the reviewer decides what to do about them.
Where This Fits
Three engineering skills evaluate code at different scopes:
| Skill | Scope | When to use |
|---|---|---|
| code-audit (this one) | Quality scan of a diff | After implementation, standalone or as input to preflight/pr-review |
| pr-review | Judgment-based delta review | Every PR, before peer approval or lead integration |
| codebase-review | Full system audit (16 categories, tiered) | Periodic health check or major milestone |
Code-audit produces findings. PR-review produces a verdict that may consume those findings. Codebase-review catches systemic patterns that no single diff reveals.
Principles
-
Fresh base branch. Compare against an up-to-date base ref. Stale base branches cause false positives (flagging code already addressed upstream) and false negatives (missing new context on the base that changes interpretation).
-
Read files in full, not just diff hunks. A diff hunk shows what changed. The surrounding file shows whether the change makes sense in context. Always read changed files in their entirety.
-
Independent judgment with complete requirements. Give the reviewer the frozen artifact universe, user outcome, acceptance criteria, exclusions and applicable decisions. Avoid priming the verdict with the producer's preferred explanation. Independence means rederiving the result against the actual requirements, not hiding the requirements. Challenge a mistaken premise with evidence and route any amendment to its decision owner.
-
State the reviewed scope and consequences. Grade the changed behavior and its affected consumers. A defect that prevents the promised outcome remains a blocker even when its lines predate the diff. Record unrelated findings separately without claiming that unreviewed code is clean. Apply stronger project rules, including fix-while-touching requirements, where present.
Diff Scope Detection
Determine what to audit:
- Uncommitted changes exist — audit staged and unstaged changes against HEAD.
- Branch has commits ahead of base — audit the range from base to HEAD.
- Nothing to diff — report that and stop.
Large diffs (40+ files): Prioritize investigation by consequence, including configuration, generated assets and lock files when they affect execution or supply-chain integrity. Divide the frozen universe into bounded review assignments with one integration owner. Track reviewed and unreviewed paths explicitly. Partial coverage produces an incomplete audit, never an unqualified Clean verdict; finish required coverage before the package can pass.
The 10-Dimension Framework
For each dimension, evaluate the changed code and assign one of:
- PASS — no issues, or only trivial stylistic preferences
- WARNING — potential problem that deserves attention but does not block shipping (missing edge-case test, minor inconsistency, could-be-better pattern)
- FAIL — concrete defect, security hole, convention violation, or missing coverage that should be fixed before merge
- UNKNOWN — a required judgment cannot be established from the available evidence or completed review coverage
1. Project Convention Compliance
Read the project's convention documentation (style guides, architectural decision records, contribution guidelines). Check every changed file against the conventions that apply to it. Flag violations with a reference to the specific convention.
If the project has no documented conventions, skip this dimension and note it as N/A.
2. Code Reuse — Existing Before New
When the diff introduces a new component, utility, hook, or abstraction, search the codebase for existing implementations that serve the same purpose. If one exists, flag the new code and recommend using the existing implementation.
When the diff introduces a behavioral pattern (overlay management, keyboard navigation, positioning logic, state machine, API wrapper, error handling), search the broader codebase for functionally similar implementations — different code serving the same purpose is still duplication.
When multiple implementations of the same pattern are found, recommend extracting a shared primitive and migrating callers.
For any shared primitive — existing, introduced in this diff, or recommended for extraction — check whether the project's conventions document it. Undocumented shared primitives will be re-implemented by contributors who do not know they exist.
3. Consistency with Existing Patterns
Read 2-3 neighboring files in the same directory or module as each changed file. Note their naming conventions, file structure, export style, error handling approach, and architectural patterns.
Compare the diff against those observed patterns. Flag divergences that are not justified by the change's purpose.
4. Security
- Auth checks on all new endpoints
- No injection vectors (SQL injection, XSS, command injection)
- Input validation at system boundaries
- No secrets, credentials, or sensitive data in code, logs, or error messages
- ORM queries preferred over raw SQL (unless justified)
5. Scalability & Enterprise Readiness
- Efficient database queries (proper indexes, no N+1, pagination)
- Async patterns used correctly
- Proper logging for observability
- Resource cleanup (connections, file handles, subscriptions)
6. Future-Proofing (Without Over-Engineering)
- Extensible where extension is likely
- Migration-safe database changes
- Clean interfaces that do not leak implementation details
- No abstractions for hypothetical requirements
7. Code Quality
- DRY — no literal code duplication (copy-pasted blocks, repeated logic). Semantic duplication (different code serving the same purpose) belongs to Dimension 2.
- Single responsibility
- Readable and self-documenting
- Proper error handling at boundaries
- Type safety
8. Test Coverage
- New behavior has corresponding test additions or updates (or a clear reason why not)
- Existing test files were not removed or gutted without replacement
- Edge cases and error paths have test coverage
9. Documentation & Comments
- No project-management artifacts in code comments (plan phases, ticket numbers, sprint references)
- No stale comments from refactoring
- Complex logic has a "why" comment
10. Cleanup
- No dead code, unused imports, or leftover debug statements
- No TODO comments without context
- No commented-out code blocks
- Consistent formatting
Reporting
Present findings as a table:
| # | Dimension | Result | Notes |
|---|---|---|---|
| 1 | Project Convention Compliance | PASS/WARNING/FAIL | details |
| 2 | Code Reuse | PASS/WARNING/FAIL | details |
| ... | ... | ... | ... |
Below the table, add a one-line verdict:
- "Clean" — all applicable dimensions PASS for the complete declared universe, with exact source/base bindings
- "Has warnings" — one or more WARNING, no FAIL
- "Has blockers" — one or more FAIL
- "Incomplete" — any required dimension or part of the declared universe is UNKNOWN or unreviewed; this cannot satisfy a readiness gate
Then list actionable findings with file and line references. For each issue, state what is wrong and how to fix it.
PR Review Mode (Cross-Referencing)
When invoked as part of a PR review workflow, existing reviewer comments may be available as context — a list of entries with reviewer, file path, line number, and comment body.
After completing all 10 dimensions, cross-reference each finding:
- File + Line match — Is there an existing reviewer comment on the same file within +/-10 lines?
- Semantic match — Does an existing comment raise the same category of concern (both flagging missing auth, both noting duplication)?
- Annotate each finding:
[Already noted by @reviewer]— same or very similar concern at the same location[Related to @reviewer's comment on file:line]— similar concern, different location[New finding]— not covered by any existing reviewer
End with a Cross-Reference Summary: count of new findings vs. already-covered findings.
This mode does not change which dimensions are checked or how issues are evaluated — it only adds overlap annotations so the reviewer knows where their review adds new value vs. confirms existing feedback.
Rules
- Always compare against a fresh base ref — never compare against a stale local ref
- Read changed files in full, not just diff hunks — context matters
- Check project convention documentation and apply project-specific rules explicitly
- Do not flag style nits in code that was not changed by this diff
- Retain outcome-blocking defects regardless of introduction date; distinguish unrelated findings and honor stronger project maintenance rules
- Bind reused findings to the actual diff, required consumer and evidence inputs. Changed material reopens the affected judgment; a new report is unnecessary when those bindings remain current.
- If the audit is invoked by another workflow (preflight, PR review), return findings to that workflow for decision-making
File metadata
name: synthesis-code-audit description: > Systematic 10-dimension quality scan of code diffs, producing scored PASS/WARNING/FAIL verdicts per dimension with a machine-readable overall result. Includes PR review mode for cross-referencing findings against existing reviewer comments. Use when asked to: code audit, audit my changes, quality check, review the diff, check this code, audit my code, scan for issues, code quality scan, diff review. license: "CC0-1.0" depends_on: [] metadata: author: "Emil Peñaló" version: "1.1.0" source_repo: "github.com/synthesisengineering/synthesis-skills" source_type: "public"
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--- name: synthesis-code-audit description: > Systematic 10-dimension quality scan of code diffs, producing scored PASS/WARNING/FAIL verdicts per dimension with a machine-readable overall result. Includes PR review mode for cross-referencing findings against existing reviewer comments. Use when asked to: code audit, audit my changes, quality check, review the diff, check this code, audit my code, scan for issues, code quality scan, diff review. license: "CC0-1.0" depends_on: [] metadata: author: "Emil Peñaló" version: "1.1.0" source_repo: "github.com/synthesisengineering/synthesis-skills" source_type: "public" --- # Synthesis Code Audit A code audit is a systematic quality measurement of a diff. It is not a judgment call about whether a change should merge — that is the reviewer's job (see synthesis-pr-review). An audit produces a scored report across 10 orthogonal dimensions, each graded independently. The report tells you *where the quality problems are*; the reviewer decides *what to do about them*. --- ## Where This Fits Three engineering skills evaluate code at different scopes: | Skill | Scope | When to use | |-------|-------|-------------| | **code-audit** (this one) | Quality scan of a diff | After implementation, standalone or as input to preflight/pr-review | | **pr-review** | Judgment-based delta review | Every PR, before peer approval or lead integration | | **codebase-review** | Full system audit (16 categories, tiered) | Periodic health check or major milestone | Code-audit produces findings. PR-review produces a verdict that may consume those findings. Codebase-review catches systemic patterns that no single diff reveals. --- ## Principles 1. **Fresh base branch.** Compare against an up-to-date base ref. Stale base branches cause false positives (flagging code already addressed upstream) and false negatives (missing new context on the base that changes interpretation). 2. **Read files in full, not just diff hunks.** A diff hunk shows what changed. The surrounding file shows whether the change makes sense in context. Always read changed files in their entirety. 3. **Independent judgment with complete requirements.** Give the reviewer the frozen artifact universe, user outcome, acceptance criteria, exclusions and applicable decisions. Avoid priming the verdict with the producer's preferred explanation. Independence means rederiving the result against the actual requirements, not hiding the requirements. Challenge a mistaken premise with evidence and route any amendment to its decision owner. 4. **State the reviewed scope and consequences.** Grade the changed behavior and its affected consumers. A defect that prevents the promised outcome remains a blocker even when its lines predate the diff. Record unrelated findings separately without claiming that unreviewed code is clean. Apply stronger project rules, including fix-while-touching requirements, where present. --- ## Diff Scope Detection Determine what to audit: - **Uncommitted changes exist** — audit staged and unstaged changes against HEAD. - **Branch has commits ahead of base** — audit the range from base to HEAD. - **Nothing to diff** — report that and stop. **Large diffs (40+ files):** Prioritize investigation by consequence, including configuration, generated assets and lock files when they affect execution or supply-chain integrity. Divide the frozen universe into bounded review assignments with one integration owner. Track reviewed and unreviewed paths explicitly. Partial coverage produces an incomplete audit, never an unqualified Clean verdict; finish required coverage before the package can pass. --- ## The 10-Dimension Framework For each dimension, evaluate the changed code and assign one of: - **PASS** — no issues, or only trivial stylistic preferences - **WARNING** — potential problem that deserves attention but does not block shipping (missing edge-case test, minor inconsistency, could-be-better pattern) - **FAIL** — concrete defect, security hole, convention violation, or missing coverage that should be fixed before merge - **UNKNOWN** — a required judgment cannot be established from the available evidence or completed review coverage ### 1. Project Convention Compliance Read the project's convention documentation (style guides, architectural decision records, contribution guidelines). Check every changed file against the conventions that apply to it. Flag violations with a reference to the specific convention. If the project has no documented conventions, skip this dimension and note it as N/A. ### 2. Code Reuse — Existing Before New When the diff introduces a new component, utility, hook, or abstraction, search the codebase for existing implementations that serve the same purpose. If one exists, flag the new code and recommend using the existing implementation. When the diff introduces a behavioral pattern (overlay management, keyboard navigation, positioning logic, state machine, API wrapper, error handling), search the broader codebase for functionally similar implementations — different code serving the same purpose is still duplication. When multiple implementations of the same pattern are found, recommend extracting a shared primitive and migrating callers. For any shared primitive — existing, introduced in this diff, or recommended for extraction — check whether the project's conventions document it. Undocumented shared primitives will be re-implemented by contributors who do not know they exist. ### 3. Consistency with Existing Patterns Read 2-3 neighboring files in the same directory or module as each changed file. Note their naming conventions, file structure, export style, error handling approach, and architectural patterns. Compare the diff against those observed patterns. Flag divergences that are not justified by the change's purpose. ### 4. Security - Auth checks on all new endpoints - No injection vectors (SQL injection, XSS, command injection) - Input validation at system boundaries - No secrets, credentials, or sensitive data in code, logs, or error messages - ORM queries preferred over raw SQL (unless justified) ### 5. Scalability & Enterprise Readiness - Efficient database queries (proper indexes, no N+1, pagination) - Async patterns used correctly - Proper logging for observability - Resource cleanup (connections, file handles, subscriptions) ### 6. Future-Proofing (Without Over-Engineering) - Extensible where extension is likely - Migration-safe database changes - Clean interfaces that do not leak implementation details - No abstractions for hypothetical requirements ### 7. Code Quality - DRY — no literal code duplication (copy-pasted blocks, repeated logic). Semantic duplication (different code serving the same purpose) belongs to Dimension 2. - Single responsibility - Readable and self-documenting - Proper error handling at boundaries - Type safety ### 8. Test Coverage - New behavior has corresponding test additions or updates (or a clear reason why not) - Existing test files were not removed or gutted without replacement - Edge cases and error paths have test coverage ### 9. Documentation & Comments - No project-management artifacts in code comments (plan phases, ticket numbers, sprint references) - No stale comments from refactoring - Complex logic has a "why" comment ### 10. Cleanup - No dead code, unused imports, or leftover debug statements - No TODO comments without context - No commented-out code blocks - Consistent formatting --- ## Reporting Present findings as a table: | # | Dimension | Result | Notes | |---|-----------|--------|-------| | 1 | Project Convention Compliance | PASS/WARNING/FAIL | details | | 2 | Code Reuse | PASS/WARNING/FAIL | details | | ... | ... | ... | ... | Below the table, add a one-line verdict: - **"Clean"** — all applicable dimensions PASS for the complete declared universe, with exact source/base bindings - **"Has warnings"** — one or more WARNING, no FAIL - **"Has blockers"** — one or more FAIL - **"Incomplete"** — any required dimension or part of the declared universe is UNKNOWN or unreviewed; this cannot satisfy a readiness gate Then list actionable findings with file and line references. For each issue, state what is wrong and how to fix it. --- ## PR Review Mode (Cross-Referencing) When invoked as part of a PR review workflow, existing reviewer comments may be available as context — a list of entries with reviewer, file path, line number, and comment body. After completing all 10 dimensions, cross-reference each finding: 1. **File + Line match** — Is there an existing reviewer comment on the same file within +/-10 lines? 2. **Semantic match** — Does an existing comment raise the same category of concern (both flagging missing auth, both noting duplication)? 3. **Annotate each finding:** - `[Already noted by @reviewer]` — same or very similar concern at the same location - `[Related to @reviewer's comment on file:line]` — similar concern, different location - `[New finding]` — not covered by any existing reviewer End with a **Cross-Reference Summary**: count of new findings vs. already-covered findings. This mode does not change which dimensions are checked or how issues are evaluated — it only adds overlap annotations so the reviewer knows where their review adds new value vs. confirms existing feedback. --- ## Rules - Always compare against a fresh base ref — never compare against a stale local ref - Read changed files in full, not just diff hunks — context matters - Check project convention documentation and apply project-specific rules explicitly - Do not flag style nits in code that was not changed by this diff - Retain outcome-blocking defects regardless of introduction date; distinguish unrelated findings and honor stronger project maintenance rules - Bind reused findings to the actual diff, required consumer and evidence inputs. Changed material reopens the affected judgment; a new report is unnecessary when those bindings remain current. - If the audit is invoked by another workflow (preflight, PR review), return findings to that workflow for decision-making
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Review before install: Avoid automatic install
License: CC0-1.0
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Low GitHub adoption signal
- AI review approval is missing
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 20 GitHub stars
- Stars/forks activity: 20 stars, 4 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: credential or environment access, network or browser surface
- Permission surface: secrets or environment access, shell or command execution
- Review status: AI review approval is missing
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Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
IndexedStatic Checked
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- synthesisengineering/synthesis-skills
- License
- CC0-1.0
- Version
- 1.1.0
- Last GitHub push
- Sep 30, 2026
- Registry updated
- Sep 30, 2026
- Instruction path
- skills/synthesis-code-audit/SKILL.md @ 78a730893908
Version reported in registry metadata; check source releases before relying on it.
Quality
54/100
Needs review
Trust
58/100
Do not auto-install
Audit
71/100
Needs review
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Low GitHub adoption signal
- AI review approval is missing
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 20 GitHub stars
- Stars/forks activity: 20 stars, 4 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: credential or environment access, network or browser surface
- Permission surface: secrets or environment access, shell or command execution
- Review status: AI review approval is missing
- Verified installs
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Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
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"sandbox_required": true,
"reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"best_for": [
"security",
"agent-skill"
],
"known_risks": [
"AI review approval is missing",
"Low GitHub adoption signal",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"GitHub adoption: 20 GitHub stars",
"Stars/forks activity: 20 stars, 4 forks; issue activity unavailable in current metadata",
"Dependency/runtime risk: credential or environment access, network or browser surface",
"Permission surface: secrets or environment access, shell or command execution"
]
},
"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": 71,
"risk_level": "needs_review",
"risk_label": "Needs review",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Low GitHub adoption signal",
"AI review approval is missing",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"GitHub adoption: 20 GitHub stars",
"Stars/forks activity: 20 stars, 4 forks; issue activity unavailable in current metadata"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 54,
"label": "Needs review"
},
"supply": {
"track": "Coding and developer agents",
"scenario": "Coding agents",
"maintenance": "3d since push",
"risk": "Needs review"
},
"alternative_skills": [
{
"slug": "mattpocock-code-review",
"name": "Code Review",
"url": "https://www.openagentskill.com/skills/mattpocock-code-review",
"stars": 168580,
"install_command": "",
"trust_score": 92,
"audit_score": 93
},
{
"slug": "mattpocock-implement",
"name": "Implement",
"url": "https://www.openagentskill.com/skills/mattpocock-implement",
"stars": 175741,
"install_command": "",
"trust_score": 89,
"audit_score": 91
}
],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"Low GitHub adoption signal",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"AI review approval is missing",
"Quality score needs review"
],
"agent_contract": {
"task_input": "Use synthesis-code-audit in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 66/100 Manual review",
"Audit: 71/100 Needs review",
"Safety: 27/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "synthesisengineering-synthesis-code-audit (synthesis-code-audit)",
"install_command": "npx skills add synthesisengineering/synthesis-skills --skill synthesis-code-audit",
"risk_summary": "Needs review; Blocked for auto-install; 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": "synthesisengineering-synthesis-code-audit",
"task": "Use synthesis-code-audit 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/synthesisengineering-synthesis-code-audit",
"api": "https://www.openagentskill.com/api/agent/skills/synthesisengineering-synthesis-code-audit",
"audit": "https://www.openagentskill.com/skills/synthesisengineering-synthesis-code-audit/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=synthesisengineering-synthesis-code-audit&task=Use%20synthesis-code-audit%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20synthesis-code-audit%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20synthesis-code-audit%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/synthesisengineering-synthesis-code-audit/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/synthesisengineering-synthesis-code-audit"
}
}For the creator
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- Creator
- Emil Peñaló
- Indexed by
- OpenAgentSkill community index
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