deep-thought

deep-thought is a plugin for Claude Code from ondrej-svec/heart-of-gold-toolkit. Its manifest loads nothing; the 11 skills, 9 agents it bundles cost 1,383 tokens per session together, scanned A, original, MIT.

A plugin containing reasoning tools for brainstorming, planning, architecture design and extended problem-solving. The description does not provide further details about its individual tools.

In plain words
What is it for?
It is intended for brainstorming, planning, designing software architecture and thinking through difficult questions.
Why use it?
The available information is too limited to say which specific problems it removes or how its tools work.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit It is intended for brainstorming, planning, designing software architecture and thinking through difficult questions.

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Install in Claude Code
/plugin marketplace add ondrej-svec/heart-of-gold-toolkit/plugin install deep-thought
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/ondrej-svec/heart-of-gold-toolkit

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 deep-thought

README.md
[![agentmods](https://agentmods.dev/badge/plugins/ondrej-svec/heart-of-gold-toolkit/deep-thought/github.svg)](https://agentmods.dev/plugins/ondrej-svec/heart-of-gold-toolkit/deep-thought)
Your own site
<a href="https://agentmods.dev/plugins/ondrej-svec/heart-of-gold-toolkit/deep-thought"><img src="https://agentmods.dev/badge/plugins/ondrej-svec/heart-of-gold-toolkit/deep-thought/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 deep-thought

Your own site · 80×15
<a href="https://agentmods.dev/plugins/ondrej-svec/heart-of-gold-toolkit/deep-thought"><img src="https://agentmods.dev/badge/plugins/ondrej-svec/heart-of-gold-toolkit/deep-thought.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 The manifest loads nothing itself; its 11 skills, 9 agents cost 1,383 tokens a session between them.
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

deep-thought 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 9d 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.

plugins/deep-thought/.claude-plugin/plugin.json · 13 lines

What it actually says

{
  "name": "deep-thought",
  "version": "0.4.0",
  "description": "The Answer Computer — reasoning tools for brainstorming, planning, architecture design, and deep thinking",
  "author": {
    "name": "ondrej-svec",
    "url": "https://github.com/ondrej-svec"
  },
  "homepage": "https://github.com/ondrej-svec/heart-of-gold-toolkit/tree/main/plugins/deep-thought",
  "repository": "https://github.com/ondrej-svec/heart-of-gold-toolkit",
  "license": "MIT"
}
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. 9d ago First seen · 13 lines scan A bf77aadac50e

Subscribe to this mod's changes

deep-thought is a plugin published in the GitHub repository ondrej-svec/heart-of-gold-toolkit (19 stars, last pushed 20d 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.