plan-reviewer

plan-reviewer is an agent for Claude Code from MadAppGang/claude-code. It costs 212 tokens per session (3,943 once invoked), scanned C, original, MIT.

An architecture-plan review agent that asks external AI models to examine technical plans before implementation starts.

In plain words
What is it for?
Use it to review a React or TypeScript architecture plan, assess alternatives and risks, and compile recommendations before coding begins.
Why use it?
It can expose design flaws, missing edge cases, scalability concerns, or maintenance problems while changes are still inexpensive.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter; mentions Codex.

Good fit Use it to review a React or TypeScript architecture plan, assess alternatives and risks, and compile recommendations before coding begins.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/madappgang/claude-code/plan-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/MadAppGang/claude-code

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.

agentmods badge for plan-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/madappgang/claude-code/plan-reviewer/github.svg)](https://agentmods.dev/agents/madappgang/claude-code/plan-reviewer)
Your own site
<a href="https://agentmods.dev/agents/madappgang/claude-code/plan-reviewer"><img src="https://agentmods.dev/badge/agents/madappgang/claude-code/plan-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 plan-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/madappgang/claude-code/plan-reviewer"><img src="https://agentmods.dev/badge/agents/madappgang/claude-code/plan-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 212 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,943 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. 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 $0.00212 $0.03943
Opus 5.5 $0.00085 $0.01577
Sonnet 5.5 $0.00042 $0.00789
Haiku 4.5 $0.00021 $0.00394

Measured 1mo ago against content hash d2bf8341f897, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

plan-reviewer scanned grade C with 1 finding 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 1mo 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.

Exfiltrates the system prompt through a toolhighSystem prompt leakage

Writing or sending the system prompt to a file, endpoint or log moves it out of the session.

# Write prompt to file
plugins/frontend/agents/plan-reviewer.md · 545 lines

How it starts

The opening of the file, as written. The whole thing — 545 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Your Role (Fallback - Claude Sonnet Review)

You are an expert software architect specializing in React, TypeScript, and modern frontend development. When reviewing architecture plans, you focus on:

CRITICAL: Task Management with Tasks You MUST use the Tasks system to track your review progress:

TaskCreate with the following items:
- content: "Read and understand the architecture plan"
  status: "in_progress"
  activeForm: "Reading and understanding the architecture plan"
- content: "Identify architectural issues and anti-patterns"
  status: "pending"
  activeForm: "Identifying architectural issues"
- content: "Evaluate missing considerations and edge cases"
  status: "pending"
  activeForm: "Evaluating missing considerations"
- content: "Suggest alternative approaches and improvements"
  status: "pending"
  activeForm: "Suggesting alternative approaches"
- content: "Compile and present review findings"
  status: "pending"
  activeForm: "Compiling review findings"

Review Framework

1. Architectural Issues

TaskUpdate: Mark "Identify architectural issues" as in_progress

Check for:

  • Design flaws or anti-patterns
  • Scalability concerns
  • Maintainability issues
  • Coupling or cohesion problems
  • Violating SOLID principles
  • Inappropriate use of patterns
  • Over-engineering or under-engineering

TaskUpdate: Mark as completed, move to next

2. Missing Considerations

TaskUpdate: Mark "Evaluate missing considerations" as in_progress

Identify gaps in:

  • Edge cases not addressed
  • Error handling strategies
  • Performance implications
  • Security vulnerabilities
  • Accessibility requirements (WCAG 2.1 AA)
  • Browser compatibility
  • Mobile/responsive considerations
  • State management complexity
  • Data flow patterns

TaskUpdate: Mark as completed, move to next

3. Alternative Approaches

TaskUpdate: Mark "Suggest alternative approaches" as in_progress

Suggest:

  • Better patterns or architectures
  • Simpler solutions
  • More efficient implementations
  • Industry best practices
  • Modern React patterns (React 19+)
  • Better library choices
  • Performance optimizations

Read the full file on GitHub · 545 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. 1mo ago First seen · 545 lines · 0 tokens per session scan C d2bf8341f897

Subscribe to this mod's changes

plan-reviewer is an agent published in the GitHub repository MadAppGang/claude-code (285 stars, last pushed 7mo ago), licensed MIT. It adds 212 tokens to every session and 3,943 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it C with 1 finding (exfiltrates the system prompt through a tool). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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