agentmods.dev

Explainer

A format for creating dark HTML reference documents where diagrams explain the subject and short captions provide context. Each section uses a custom inline SVG visual, such as a decision tree, timeline, or process diagram.

In plain words
What is it for?
Use it to create or revise visual explainers, system overviews, process maps, risk matrices, timelines, and other diagram-led reference pages.
Why use it?
It helps readers scan complex systems without working through long blocks of prose. It also provides checks for common HTML and SVG problems before the document is opened.

Skill for Claude CodeCodex

1 3mo ago A scan 209 tokens original MIT
View the source file Angelopvtac/explainer-pack
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.

agentmods
npx agentmods add skills/angelopvtac/explainer-pack/explainer
Any agent
npx skills add Angelopvtac/explainer-pack --skill explainer
Clone the repo
git clone --depth 1 https://github.com/Angelopvtac/explainer-pack

Made for: Claude Code, Codex.

Per session 209 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,464 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00209 $0.01464
Opus 5 $0.00105 $0.00732
Sonnet 5 $0.00042 $0.00293
Haiku 4.5 $0.00021 $0.00146

Measured yesterday against content hash 21f21e00e223, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Explainer 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.

The scan reads SKILL.md. This mod also ships 2 executable files (Tools/render.ts, Tools/verify.ts), 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.

skills/Explainer/SKILL.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Explainer

A signature visual-first HTML format. Dense, dark-themed, diagram-driven reference documents that compress complex systems into scannable visual sections. Each section is a custom inline-SVG diagram with a one-line caption — never a paragraph.

The rule

If a section is mostly prose, the skill is being misused. Every section must have a visualization that carries the meaning. Prose is captions. Captions are one sentence. If the meaning needs three sentences, the diagram is wrong.

Canonical example

See examples/sample-explainer.html in the pack — a complete, self-contained explainer demonstrating sections, SVG diagrams, and the aesthetic. That is the bar.

Workflow Routing

Workflow Trigger File
Generate "make an explainer", "build a visual doc", "explainer for X" Workflows/Generate.md
Revise "revise section N of the explainer", "update the X section in {path}", "fix section N in explainer" Workflows/Revise.md

Tools

  • Tools/verify.ts — pre-open gate. Checks HTML5 shape, viewBox on every renderable <svg>, no duplicate ids, and prose-creep per section. Run before opening.
  • Tools/render.ts — substitutes {{KEY}} placeholders in Boilerplate.html from a JSON object (HTML-escaped by default; raw_ prefix for raw HTML). Accepts --theme=<name> to pick a theme from Themes/. Default: anthropic.

References

  • References/Philosophy.md — visual-first rules, anti-patterns, when to use what
  • References/Aesthetic.md — CSS tokens, typography, spacing, color semantics
  • References/Components.md — catalog of 15 reusable diagram patterns with code
  • References/Boilerplate.html — ready-to-clone base template; CSS is structure-only and references token names (var(--bg), var(--accent), etc.) supplied by the selected theme

Themes

Five baked-in themes, each a single CSS file in Themes/. The structural rules (single chrome accent, color is semantic and lives in the data layer only, chrome retreats, diagrams over prose) are universal — themes only change the surface, ink, accent, data palette, font stack, and a few component-level details.

Read the full file on GitHub · 86 lines

Files

What ships with it

13 files beside SKILL.md 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.

  1. yesterday First seen · 86 lines · 209 tokens per session scan A 21f21e00e223

Subscribe to this mod's changes

Explainer is a skill published in the GitHub repository Angelopvtac/explainer-pack (1 stars, last pushed 3mo ago), licensed MIT. It adds 209 tokens to every session and 1,464 once invoked, about $0.0010 per session on Opus 5. 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 2026-08-31.

Frontendclaude-codeclaude-code-pluginclaude-skilldata-visualizationdatavizdesign-system
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