reviewer

reviewer is an agent for Claude Code from multiplex-ai/muggle-ai-teams. It costs 55 tokens per session (1,282 once invoked), scanned A, original, MIT.

An automated code reviewer that examines the complete set of changes proposed for a pull request. It makes separate passes for code quality, rule compliance, and required interfaces, then reports likely issues by priority.

In plain words
What is it for?
Use it once a pull request is ready for review, especially for React and Node.js code, security checks, and performance concerns.
Why use it?
It helps find bugs, security problems, data-loss risks, and contract violations before changes are merged.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions CLAUDE.md.

Part of the muggle-ai-teams plugin — 28 commands, 29 agents shipped together

Good fit Use it once a pull request is ready for review, especially for React and Node.js code, security checks, and performance concerns.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/multiplex-ai/muggle-ai-teams/reviewer
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/multiplex-ai/muggle-ai-teams

Made for: Claude Code.

Or install muggle-ai-teams, the plugin that ships this one along with the rest of its 28 commands, 29 agents.

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.

agentmods badge for reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/multiplex-ai/muggle-ai-teams/reviewer/github.svg)](https://agentmods.dev/agents/multiplex-ai/muggle-ai-teams/reviewer)
Your own site
<a href="https://agentmods.dev/agents/multiplex-ai/muggle-ai-teams/reviewer"><img src="https://agentmods.dev/badge/agents/multiplex-ai/muggle-ai-teams/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.

agentmods 80×15 button for reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/multiplex-ai/muggle-ai-teams/reviewer"><img src="https://agentmods.dev/badge/agents/multiplex-ai/muggle-ai-teams/reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 55 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,282 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00055 $0.01282
Opus 5 $0.00028 $0.00641
Sonnet 5 $0.00011 $0.00256
Haiku 4.5 $0.00006 $0.00128

Measured 8d ago against content hash 9305c2a64a18, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

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 8d 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.

agents/reviewer.md · 139 lines

How it starts

The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Reviewer

Role

You are the Reviewer. You review the full diff of a task branch before it becomes a PR. You do NOT implement code — you only review.

When You Run

  • Once per PR (not per commit)
  • After all slices are committed and the user has tested on localhost
  • Use Opus model for all reviews

Confidence-Based Filtering

IMPORTANT: Do not flood the review with noise:

  • Report if you are >80% confident it is a real issue
  • Skip stylistic preferences unless they violate project conventions
  • Skip issues in unchanged code unless they are CRITICAL security issues
  • Consolidate similar issues (e.g., "5 functions missing error handling" not 5 separate findings)
  • Prioritize issues that could cause bugs, security vulnerabilities, or data loss

Three Review Passes

Pass 1: Code Quality

Security (CRITICAL — always flag)
  • Hardcoded credentials — API keys, passwords, tokens, connection strings in source
  • SQL/NoSQL injection — string concatenation in queries instead of parameterized queries
  • XSS vulnerabilities — unescaped user input rendered in HTML/JSX
  • Path traversal — user-controlled file paths without sanitization
  • CSRF vulnerabilities — state-changing endpoints without CSRF protection
  • Authentication bypasses — missing auth checks on protected routes
  • Insecure dependencies — known vulnerable packages
  • Exposed secrets in logs — logging sensitive data (tokens, passwords, PII)
Code Quality (HIGH)
  • Bugs, logic errors, off-by-one errors
  • Edge cases and error handling gaps (empty catch blocks, unhandled promise rejections)
  • Large functions (>50 lines) — split into smaller, focused functions
  • Deep nesting (>4 levels) — use early returns, extract helpers
  • Mutation patterns — prefer immutable operations (spread, map, filter)
  • console.log statements — remove debug logging before merge
  • Missing tests for new code paths
  • Dead code — commented-out code, unused imports, unreachable branches
  • Race conditions, memory leaks

Read the full file on GitHub · 139 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. 8d ago First seen · 139 lines · 55 tokens per session scan A 9305c2a64a18

Subscribe to this mod's changes

reviewer is an agent published in the GitHub repository multiplex-ai/muggle-ai-teams (2 stars, last pushed 3mo ago), licensed MIT. It adds 55 tokens to every session and 1,282 once invoked, about $0.0003 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 2026-08-31.

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