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/ascii)<a href="https://agentmods.dev/skills/yarikleto/claude-teacher-plugin/ascii"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/ascii/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/ascii"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/ascii.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 | $0.00092 | $0.01733 |
| Opus 5 | $0.00046 | $0.00866 |
| Sonnet 5 | $0.00018 | $0.00347 |
| Haiku 4.5 | $0.00009 | $0.00173 |
Grade A, and why
ascii 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 3d 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 — 165 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}.
ASCII
Create ASCII art diagrams with detailed educational explanations. All output is pure Unicode box-drawing art — renders in any modern terminal, no external tools needed.
Invocation
/claude-teacher:ascii <concept description>
Style Selection
| Concept Type | Style | Example Use |
|---|---|---|
| Time-ordered (protocol flows, request/response) | Sequence diagram | TCP handshake, HTTP request |
| States/decisions (transitions, branching) | Flowchart | Connection lifecycle, error handling |
| Byte-level/structural (memory, packets, formats) | RFC-style grid or table | TCP header, packet layout |
| Relationships/architecture (components, deps) | Box-and-line with layers | System architecture, module deps |
| Comparisons (A vs B) | Side-by-side or before/after | Active vs passive mode |
| Hierarchies (trees, org charts) | Tree with branches | Directory structure, class hierarchy |
Character Toolkit
Visual hierarchy through line weight:
| Weight | Characters | Use For |
|---|---|---|
| Double | ═ ║ ╔ ╗ ╚ ╝ ╠ ╣ ╦ ╩ ╬ |
Outer boundaries, system borders, emphasis |
| Single | ─ │ ┌ ┐ └ ┘ ├ ┤ ┬ ┴ ┼ |
Standard boxes, connections |
| Rounded | ╭ ╮ ╰ ╯ |
Softer/informal elements |
| Dashed | ┄ ┆ or - - - |
Optional, conditional, weak relationships |
| Heavy | ━ ┃ ┏ ┓ ┗ ┛ |
Bold emphasis |
Arrows: → ← ↑ ↓ ↔ standard, ▶ ◀ ▲ ▼ filled, ⇒ ⇐ double
Fill/shading: ░ light, ▒ medium, ▓ dark, █ full
Elision: ⋮ vertical omission, ⋯ horizontal omission
Style Recipes
Sequence Diagram
Client Server
│ │
│ SYN (seq=x) │
│───────────────────▶│
│ │
│ SYN-ACK (seq=y) │
│◀───────────────────│
│ │
- Vertical lifelines per actor, names at top
- Horizontal arrows with labels above
- Consistent column spacing and arrow lengths
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.
- 3d ago Changed · +4 lines · +15 tokens per session 7d98ef8b198f
- 11d ago First seen · 161 lines · 77 tokens per session scan A 0c9ca0a23e5a
ascii is a skill published in the GitHub repository yarikleto/claude-teacher-plugin (8 stars, last pushed 4d ago), licensed MIT. It adds 92 tokens to every session and 1,733 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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