A set of written instructions for AI coding tools such as Claude Code, Cursor, and Codex. It guides them toward making considered decisions and checking their work before declaring it finished.

Use it when you want an AI coding tool to choose sensible defaults, explain decisions, and verify changes before finishing.

It helps reduce rushed decisions and unverified claims that a coding task is complete. It gives the tool consistent rules for judging and reviewing its own work.

mastermind — Plugin by mehrad-dm

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.

Claude Code

/plugin marketplace add mehrad-dm/mastermind

agentmods

npx agentmods add plugins/mehrad-dm/mastermind/mastermind

Clone the repo

git clone --depth 1 https://github.com/mehrad-dm/mastermind

Made for: Claude Code.

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. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

mastermind 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-plugin/plugin.json · 21 lines

What it actually says

{
  "$schema": "https://www.schemastore.org/claude-code-plugin-manifest.json",
  "name": "mastermind",
  "description": "A markdown brain that gives your AI coding tools judgment and rigor: sharp defaults, real decisions, and the discipline to verify before saying done. For Claude Code, Cursor and Codex.",
  "version": "0.32.1",
  "hooks": "./hooks/hooks.json",
  "author": {
    "name": "mehrad-dm"
  },
  "homepage": "https://mastermind.mehrad.me",
  "repository": "https://github.com/mehrad-dm/mastermind",
  "license": "MIT",
  "keywords": [
    "skills",
    "agents",
    "engineering",
    "workflow",
    "rigor"
  ]
}

Files

What ships with it

1 file beside plugin.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.

marketplace.json 1.2 KB

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 · 21 lines scan A e025b8d9e16b

Subscribe to this mod's changes

mastermind is a plugin published in the GitHub repository mehrad-dm/mastermind (23 stars, last pushed 2d 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 2026-08-30.

Data and AI ai ai-agents claude claude-code codex coding-assistant

mastermind

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What ships with it

What this file has done since we first saw it

Other plugins, from other repositories

example-marketplace

minimalist

minimalist

roberts-skills

macos-notch

prompt-engineering-expert