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 18d ago.

The scan reads gemini-extension.json. This mod also ships 5 executable files (scripts/build-adapters.js, scripts/bump.sh, scripts/check-rule-copies.js, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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": "2.6.13",
  "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"
    }
  ]
}

Files

What ships with it

6 files beside gemini-extension.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

18d ago Changed bf441ff75223
24d ago Changed 1d0bf5ffbe44
1mo ago Changed 2aac5e196436
1mo ago Changed 9407cc422d84
1mo ago Changed 7d196df59388
1mo ago Changed 3102a655fbdd
2mo ago First seen · 29 lines scan A dd896b539cd4

Subscribe to this mod's changes

matcha is a plugin published in the GitHub repository plumpslabs/matcha (2 stars, last pushed 19d ago), 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.

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

matcha next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
matchaplumpslabs/matcha	Plugin	2	19d ago	MIT	A	—	Gemini CLI
backend-architecturejohnkozaris/jko-claude-plugins	Plugin	11	9d ago	MIT	A	—	Claude Code
code-cleanupjohnkozaris/jko-claude-plugins	Plugin	11	9d ago	MIT	A	—	Claude Code
owndiffowndiff/own-your-diff	Plugin	4	3mo ago	MIT	A	—	Claude Code
genesis-spec-kitNagiliant/Genesis-Legacy-V2	Plugin	2	4mo ago	Apache-2.0	A	—	Claude Code
image-fetchersacredvoid/image-fetcher	Plugin	4	8mo ago	MIT	A	—	Claude Code
humanizerblader/humanizer	Plugin	69k	5d ago	MIT	A	—	Claude Code