Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add yarikleto/claude-teacher-plugin/plugin install claude-teacherWrote 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/yarikleto/claude-teacher-plugin/demo)<a href="https://agentmods.dev/skills/yarikleto/claude-teacher-plugin/demo"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/demo/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/yarikleto/claude-teacher-plugin/demo"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/demo.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 | $0.00100 | $0.03496 |
| Opus 5 | $0.00050 | $0.01748 |
| Sonnet 5 | $0.00020 | $0.00699 |
| Haiku 4.5 | $0.00010 | $0.00350 |
Grade A, and why
demo 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.
How it starts
The opening of the file, as written. The whole thing — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Requested topic/task: $ARGUMENTS
Before accessing education data, read ${CLAUDE_PLUGIN_ROOT}/references/education-data.md. Resolve every <education-db> below using that contract. Current session ID: ${CLAUDE_SESSION_ID}.
Demo — Interactive Animated Diagrams
Generate .html files with animated, interactive visualizations. Uses a template with built-in engine, drawing library, and Preact UI — you only write the steps and draw functions.
Invocation
/claude-teacher:demo <concept description>
When to Use This
/claude-teacher:demo |
/claude-teacher:excalidraw |
/claude-teacher:ascii |
|---|---|---|
| Needs animation (packets moving, sort steps) | Complex but static (architecture, data structures) | Quick inline terminal visual |
| Step-by-step walkthrough with play/pause | Student wants to edit/rearrange the diagram | Simple sequence or flowchart |
| Timing matters (race conditions, event loops) | Diagram will be exported as image | Just needs a quick look |
Template Architecture
The template at ${CLAUDE_SKILL_DIR}/template.html ships with:
| Layer | Technology | What it provides |
|---|---|---|
| UI | Preact + HTM (CDN) | Reactive controls, step navigation, keyboard shortcuts |
| Styling | Bootstrap 5 + Icons (CDN) + custom dark theme | Pretty buttons, icons, responsive layout, utilities |
| Canvas | Native Canvas 2D + drawing library | Drawing helpers, animation math, color theming |
| Engine | Built into template | Animation loop, step progression, speed control |
You only fill in the content section between __CONTENT_START__ and __CONTENT_END__.
Process
- Research the concept using WebSearch — verify accuracy
- Read the template at
${CLAUDE_SKILL_DIR}/template.html - Copy the template to
docs/<concept-name>.html - Replace placeholders:
__TITLE__→ concept name (document title and visible heading)__SUBTITLE__→ one-line description (visible subtitle)__SOURCE_HTML__→ source link, e.g.Source: <a href="https://...">RFC 793</a>__CUSTOM_CSS__→ any concept-specific CSS (usually empty — use Bootstrap utilities first) Escape replacements for their actual context: HTML text/attributes and JavaScript template literals require different escaping. Never paste raw topic text into JavaScript; serialize data and escape<as\u003cinside scripts. Only emit verified HTTP(S) source links.
- Replace the content section (
__CONTENT_START__to__CONTENT_END__) with your STEPS array and optional drawBackground/drawOverlay functions - Validate the generated JavaScript and open the result in a browser when available. Check play/pause, navigation, theme, responsive sizing, and console errors. If browser verification is unavailable, disclose it.
- Save and tell the student how to open it
What ships with it
1 file 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.
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 Changed · +6 lines · +10 tokens per session 2b76129495fb
- 10d ago First seen · 285 lines · 90 tokens per session scan A 7d209870a159
demo is a skill published in the GitHub repository yarikleto/claude-teacher-plugin (8 stars, last pushed 4d ago), licensed MIT. It adds 100 tokens to every session and 3,496 once invoked, about $0.0005 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.
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