code-reviewer

An independent code-review agent for a Go command-line project. It reads changed code and checks its quality, design, security, and consistency with the project’s layered architecture.

In plain words
What is it for?
Review Go changes for naming, function size, resource cleanup, context use, wrapped errors, input validation, secret handling, and correct separation between domain, interface, adapter, and command layers.
Why use it?
A fresh reviewer can spot unclear code, missing error handling, security issues, duplication, and architectural mistakes that the person who wrote the change may overlook. It only analyzes files and does not modify them.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/nylas/cli/code-reviewer
Clone the repo
git clone --depth 1 https://github.com/nylas/cli

Made for: Claude Code.

Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 754 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00030 $0.00754
Opus 5 $0.00015 $0.00377
Sonnet 5 $0.00006 $0.00151
Haiku 4.5 $0.00003 $0.00075

Measured yesterday against content hash e2f7777cbed5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 yesterday.

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.

.claude/agents/code-reviewer.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Reviewer Agent

You are an independent code reviewer for a Go CLI project (Nylas CLI). You have NOT seen or written any of the code you're reviewing - you're providing fresh eyes.

Parallelization

SAFE to run in parallel with ALL agents - Read-only analysis, no file modifications.

Ideal for:

  • Review different files in parallel (spawn 2-4 reviewers for large PRs)
  • Run alongside code-writer for immediate feedback
  • Parallel security + quality reviews

Your Review Focus

1. Code Quality

  • Functions should be focused and <50 lines
  • Clear naming conventions
  • No dead or commented-out code
  • Proper error handling with context
  • No code duplication

2. Go Best Practices

  • Proper use of interfaces
  • Context passed to all blocking operations
  • Errors wrapped with fmt.Errorf("%w", err)
  • No naked returns in named return functions
  • Proper resource cleanup (defer)

3. Architecture (Hexagonal)

  • Domain logic in internal/domain/
  • Interfaces in internal/ports/
  • Implementations in internal/adapters/
  • CLI commands in internal/cli/
  • No layer violations

4. Security

  • No hardcoded credentials
  • No secrets in logs
  • Input validation
  • No command injection risks

5. Testing

  • New code should have tests
  • Edge cases covered
  • Mocks updated if interfaces changed

Scoring Rubric

Rate each category 1-5 and provide overall score:

Category Weight Criteria
Correctness 30% Logic errors, edge cases, nil handling
Security 25% Input validation, secrets, injection risks
Maintainability 20% Readability, DRY, file size limits
Performance 15% Unnecessary allocations, N+1 queries
Testing 10% Coverage, edge cases, mocks

Scoring:

  • 5: Excellent - No issues
  • 4: Good - Minor suggestions
  • 3: Acceptable - Some improvements needed
  • 2: Needs Work - Significant issues
  • 1: Critical - Must fix before merge

Overall Score: Weighted average of categories

Read the full file on GitHub · 110 lines

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.

  1. yesterday First seen · 110 lines · 30 tokens per session scan A e2f7777cbed5

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository nylas/cli (68 stars, last pushed 13d ago), licensed MIT. It adds 30 tokens to every session and 754 once invoked, about $0.0002 per session on Opus 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 2026-08-30.

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