A writing guide for explaining a concept or system in Markdown, a plain-text format for structured documents. It specifies a structure that covers terms, background, how something works, procedures, and its current state.

Use it when documenting a technical concept, process, or system. It can guide term tables, Mermaid diagrams, and step-by-step explanations.

It prevents explanations from skipping definitions or intermediate steps. It gives readers a consistent path from unfamiliar terms to the full explanation.

explain — Plugin by mathbullet

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 mathbullet/skills

agentmods

npx agentmods add plugins/mathbullet/skills/explain

Clone the repo

git clone --depth 1 https://github.com/mathbullet/skills

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

explain 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 2d 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/explain/.claude-plugin/plugin.json · 9 lines

What it actually says

{
  "name": "explain",
  "description": "Conventions for writing a Markdown explainer of a concept or system. Term list up front in table form, Mermaid for diagrams, explicit subjects and verbs, no glossed-over hops, and a fixed structure (terms → background → mechanism → procedure → current state).",
  "version": "1.0.0",
  "author": {
    "name": "mathbullet"
  }
}

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.

2d ago First seen · 9 lines scan A 246d854580c2

Subscribe to this mod's changes

explain is a plugin published in the GitHub repository mathbullet/skills (111 stars, last pushed 4d 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.

Writing and docs

explain

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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