An engineering ruleset for making software changes simple, deliberate, and non-duplicative. It includes checks for task intent, existing code, stack overlap, and post-change efficiency.

Use it to clarify a task before coding, audit a technology stack for duplication, and review a completed implementation for efficiency.

It provides a repeatable way to avoid unnecessary work and catch inefficient or overlapping solutions. The rules also support a review after implementation.

matcha — Plugin for Gemini CLI by plumpslabs

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/plumpslabs/matcha

Made for: Gemini CLI.

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/plugins/plumpslabs/matcha/gemini-extension/github.svg)](https://agentmods.dev/plugins/plumpslabs/matcha/gemini-extension)

Your own site

<a href="https://agentmods.dev/plugins/plumpslabs/matcha/gemini-extension"><img src="https://agentmods.dev/badge/plugins/plumpslabs/matcha/gemini-extension/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/plugins/plumpslabs/matcha/gemini-extension"><img src="https://agentmods.dev/badge/plugins/plumpslabs/matcha/gemini-extension.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

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.

Security

Grade A, and why

matcha 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.

gemini-extension.json · 29 lines

What it actually says

{
  "name": "matcha",
  "version": "2.5.42",
  "description": "Engineering philosophy ruleset — simple, efficient, deliberate. Never twice.",
  "skills": [
    {
      "name": "matcha",
      "path": "skills/matcha"
    }
  ],
  "commands": [
    {
      "name": "matcha:why",
      "description": "Run Intent Discovery check on current task",
      "path": "commands/matcha:why.md"
    },
    {
      "name": "matcha:audit",
      "description": "Audit stack for overlaps and inefficiencies",
      "path": "commands/matcha:audit.md"
    },
    {
      "name": "matcha:review",
      "description": "Post-implementation efficiency review",
      "path": "commands/matcha:review.md"
    }
  ]
}

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.

yesterday First seen · 29 lines scan A dd896b539cd4

Subscribe to this mod's changes

matcha is a plugin published in the GitHub repository plumpslabs/matcha (1 stars, last pushed yesterday), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-09-11.

Code review Planning ai-agents ai-coding claude cline cursor-rules

code-cleanup

Evidence-first cleanup of agent trajectory residue, dead islands, split-brain authority, stale dependencies, and unnecessary code across repositories.

johnkozaris/jko-claude-plugins · not measured

backend-architecture

Small, opinionated architecture guide for production backend services across languages and frameworks.

johnkozaris/jko-claude-plugins · not measured

owndiff

Local ownership gate and multiple choice question approval skill for AI-assisted code diffs.

owndiff/own-your-diff · not measured

senior-dev-skills marketplace

Plugin marketplace listing 1 plugin: senior-dev-skills.

the-senior-dev/senior-dev-skills · not measured

genesis-spec-kit

AI coding with intent — the end of vibe coding. A spec-driven pipeline for Claude Code that loops a five-lens audit to zero findings before code ships. It won't save you time or tokens; it saves you from slop. File-backed, no external services. Legacy (V2-era) edition.

Nagiliant/Genesis-Legacy-V2 · not measured

image-fetcher

Fetch relevant, high-quality, free-to-use images from the web for any project context. Scans your directory for context or takes a description, searches Unsplash/Pexels/Pixabay (API or zero-config WebSearch fallback), presents curated picks, and downloads to your project.

sacredvoid/image-fetcher · not measured