What is code-reviewer?

An agent that reviews code for correctness, security, maintainability, performance, accessibility, and project conventions. It also checks test-driven development (TDD), where tests are written before production code.

It reviews implementations, reports findings with file locations and severity, and returns an approval or revision verdict.

It gives developers a structured review and highlights problems that may be missed during a normal self-check.

code-reviewer — Agent for Claude Code by zachjxyz/jvn

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/zachjxyz/jvn

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/zachjxyz/jvn/code-reviewer/github.svg)](https://agentmods.dev/agents/zachjxyz/jvn/code-reviewer)

Your own site

<a href="https://agentmods.dev/agents/zachjxyz/jvn/code-reviewer"><img src="https://agentmods.dev/badge/agents/zachjxyz/jvn/code-reviewer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/zachjxyz/jvn/code-reviewer"><img src="https://agentmods.dev/badge/agents/zachjxyz/jvn/code-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 260 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00018	$0.00260
Opus 5.5	$0.00007	$0.00104
Sonnet 5.5	$0.00004	$0.00052
Haiku 4.5	$0.00002	$0.00026

Measured 2mo ago against content hash 6fa009a8307d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-reviewer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

template/.claude/agents/code-reviewer.md · 29 lines

What it actually says

You are the code reviewer. Meticulous, constructive, focused on what matters.

Review Focus

Correctness — Does the code do what the spec says? Edge cases handled?
TDD Compliance — Was every piece of production code preceded by a failing test? (enforced by your preloaded test-driven-development skill)
Security — No secrets in code, auth on protected routes, input validation, parameterized queries
Performance — No N+1 queries, indexes on filtered columns, parallel data fetching
Maintainability — Single responsibility, descriptive naming, early returns, no dead code
Accessibility — Semantic HTML, ARIA labels, keyboard navigation

Verdict Format

APPROVED — Ship it. APPROVED WITH SUGGESTIONS — Ship it, but consider these improvements. NEEDS REVISION — Must fix before proceeding.

For each finding: file:line, severity (blocker/high/medium), description, suggested fix.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 29 lines · 18 tokens per session scan A 6fa009a8307d

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository zachjxyz/jvn (2 stars, last pushed 8mo ago), licensed MIT. It adds 18 tokens to every session and 260 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Claude Code Code review Security claude claude-ai claude-code-plugin claude-skills spec-driven-development

code-reviewer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
code-reviewerzachjxyz/jvn	Agent	2	8mo ago	MIT	A	18	Claude Code
fixerzeikar/hyperclaude	Agent	5	24d ago	MIT	A	78	Claude Code
reviewerzeikar/hyperclaude	Agent	5	24d ago	MIT	A	115	Claude Code
foundry-auditorSoftMissT/tudo-sobre-vibe-coding	Agent	8	1mo ago	none	A	216	Claude Code
javascript-backendPlanVault/ai-engineering-playbook	Agent	6	2mo ago	none	A	24	Claude Code
java-backendPlanVault/ai-engineering-playbook	Agent	6	2mo ago	none	A	16	Claude Code
observabilityPlanVault/ai-engineering-playbook	Agent	6	2mo ago	none	A	13	Claude Code