Review

Review

Two-axis review of the diff between HEAD and a fixed point the user supplies:

• Standards — does the code conform to this repo's documented coding standards?
• Spec — does the code faithfully implement the originating issue / PRD / spec?

Both axes run as parallel sub-agents so they don't pollute each other's context, then this skill aggregates their findings.

The issue tracker should have been provided to you — run /setup-mauricio-vieira-skills if docs/agents/issue-tracker.md is missing.

Process

1. Pin the fixed point

Whatever the user said is the fixed point — a commit SHA, branch name, tag, main, HEAD~5, etc. Don't be opinionated; pass it through. If they didn't specify one, ask: "Review against what — a branch, a commit, or main?" Don't proceed until you have it.

Capture the diff command once: git diff ...HEAD (three-dot, so the comparison is against the merge-base). Also note the list of commits via git log ..HEAD --oneline.

2. Identify the spec source

Look for the originating spec, in this order:

1. Issue references in the commit messages (#123, Closes #45, GitLab !67, etc.) — fetch via the workflow in docs/agents/issue-tracker.md.
2. A path the user passed as an argument.
3. A PRD/spec file under docs/, specs/, or .scratch/ matching the branch name or feature.
4. If nothing is found, ask the user where the spec is. If they say there isn't one, the Spec sub-agent will skip and report "no spec available".

3. Identify the standards sources

Anything in the repo that documents how code should be written. Common locations:

• CLAUDE.md, AGENTS.md
• CONTRIBUTING.md
• CONTEXT.md, CONTEXT-MAP.md, per-context CONTEXT.md files
• docs/adr/ (architectural decisions are standards)
• .editorconfig, eslint.config.*, biome.json, prettier.config.*, tsconfig.json (machine-enforced standards — note them but don't re-check what tooling already checks)
• Any STYLE.md, STANDARDS.md, STYLEGUIDE.md, or similar at the repo root or under docs/

Collect the list of files. The Standards sub-agent will read them.

4. Spawn both sub-agents in parallel

Send a single message with two Agent tool calls. Use the general-purpose subagent for both.

Standards sub-agent prompt — include:

• The full diff command and commit list.
• The list of standards-source files you found in step 3.
• The brief: "Read the standards docs. Then read the diff. Report — per file/hunk where relevant — every place the diff violates a documented standard. Cite the standard (file + the rule). Distinguish hard violations from judgement calls. Skip anything tooling enforces. Under 400 words."

Spec sub-agent prompt — include:

• The diff command and commit list.
• The path or fetched contents of the spec.
• The brief: "Read the spec. Then read the diff. Report: (a) requirements the spec asked for that are missing or partial; (b) behaviour in the diff that wasn't asked for (scope creep); (c) requirements that look implemented but where the implementation looks wrong. Quote the spec line for each finding. Under 400 words."

If the spec is missing, skip the Spec sub-agent and note this in the final report.

5. Aggregate

Present the two reports under ## Standards and ## Spec headings, verbatim or lightly cleaned. Do not merge or rerank findings — the two axes are deliberately separate so the user can see them independently.

End with a one-line summary: total findings per axis, and the worst single issue (if any) flagged.

Why two axes

A change can pass one axis and fail the other:

• Code that follows every standard but implements the wrong thing → Standards pass, Spec fail.
• Code that does exactly what the issue asked but breaks the project's conventions → Spec pass, Standards fail.

Reporting them separately stops one axis from masking the other.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: mauriciovieira
• Source: mauriciovieira/skills
• License: MIT

Install and usage instructions live in the source repository linked above.