Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/Angelopvtac/explainer-packnpx agentmods add skills/angelopvtac/explainer-pack/explainerWrote 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.
[](https://agentmods.dev/skills/angelopvtac/explainer-pack/explainer)<a href="https://agentmods.dev/skills/angelopvtac/explainer-pack/explainer"><img src="https://agentmods.dev/badge/skills/angelopvtac/explainer-pack/explainer/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.
<a href="https://agentmods.dev/skills/angelopvtac/explainer-pack/explainer"><img src="https://agentmods.dev/badge/skills/angelopvtac/explainer-pack/explainer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00209 | $0.01464 |
| Opus 5.5 | $0.00084 | $0.00586 |
| Sonnet 5.5 | $0.00042 | $0.00293 |
| Haiku 4.5 | $0.00021 | $0.00146 |
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 1mo 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.
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,viewBoxon every renderable<svg>, no duplicateids, and prose-creep per section. Run before opening.Tools/render.ts— substitutes{{KEY}}placeholders inBoilerplate.htmlfrom a JSON object (HTML-escaped by default;raw_prefix for raw HTML). Accepts--theme=<name>to pick a theme fromThemes/. Default:anthropic.
References
References/Philosophy.md— visual-first rules, anti-patterns, when to use whatReferences/Aesthetic.md— CSS tokens, typography, spacing, color semanticsReferences/Components.md— catalog of 15 reusable diagram patterns with codeReferences/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.
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.
- References/Aesthetic.md 10 KB
- References/Boilerplate.html 15 KB
- References/Components.md 36 KB
- References/Philosophy.md 10 KB
- Themes/anthropic.css 1.5 KB
- Themes/bloomberg.css 1.8 KB
- Themes/fragapane.css 1.8 KB
- Themes/ft.css 1.8 KB
- Themes/riso-zine.css 1.6 KB
- Tools/render.ts 5.7 KB runs code
- Tools/verify.ts 10 KB runs code
- Workflows/Generate.md 7.7 KB
- Workflows/Revise.md 5.4 KB
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.
- 1mo ago First seen · 86 lines · 209 tokens per session scan A 21f21e00e223
Explainer is a skill published in the GitHub repository Angelopvtac/explainer-pack (1 stars, last pushed 5mo ago), licensed MIT. It adds 209 tokens to every session and 1,464 once invoked, about $0.0008 per session on Opus 5.5. 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.
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