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visualcave: Instructions file for Claude Code

CLAUDE.md

visualcave CLAUDE.md is an instructions file for Claude Code from varkart/visualcave. It costs 619 tokens per session, scanned A, original, MIT.

Contributor instructions for visualcave, a project that creates and tests diagrams rendered in a web browser. They explain pull-request rules, browser tests, examples, skill-file limits, and dependency restrictions.

In plain words
What is it for?
Use them before changing visualcave code, diagrams, examples, or skill instructions to run the right Playwright tests and update required files.
Why use it?
They make contributors verify that diagrams actually render and keep mirrored instruction files and examples in sync.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is varkart/visualcave's own configuration. It tells Claude Code how to work on visualcave itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything visualcave configures →

not rated 2repo 1mo ago A scan 619 tokens original MIT
View source ↗ varkart/visualcave varkart.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to varkart/visualcave. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/varkart/visualcave/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/varkart/visualcave

Made for: Claude Code.

Wrote 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.

agentmods badge for visualcave CLAUDE.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/varkart/visualcave/claude-md"><img src="https://agentmods.dev/badge/instructions/varkart/visualcave/claude-md/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.

agentmods 80×15 button for visualcave CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/varkart/visualcave/claude-md"><img src="https://agentmods.dev/badge/instructions/varkart/visualcave/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 619 This file is loaded in full into every session.
When invoked 619 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00619 $0.00619
Opus 5.5 $0.00248 $0.00248
Sonnet 5.5 $0.00124 $0.00124
Haiku 4.5 $0.00062 $0.00062

Measured 1mo ago against content hash ac9dd40dac4e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

visualcave CLAUDE.md 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.

CLAUDE.md · 50 lines

How it starts

The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Contributing to visualcave

Before You Open a PR

  1. Test your change renders. Run npm test — all Playwright tests must pass. Each test opens an HTML file in a real browser and asserts the Mermaid SVG renders without error.

  2. Keep SKILL.md under 700 words. Every word loads on every invocation. Move reference material to references/. skills/visualcave/SKILL.md is a byte-identical mirror required by the Antigravity CLI plugin loader — every SKILL.md edit must update both copies (enforced by tests/skill-md-guard.spec.js).

  3. One thing per PR. A fix, a new example, or a SKILL.md change — not all three.

  4. New diagram type? Add an example file in examples/ and a row in references/diagram-types.md. Add the example to the Playwright test list in tests/validate-examples.spec.js.

  5. New feature in capture.js / step-through.js / hover.js? Include a before/after test showing it works. These files run in the browser or via Node — prose alone isn't enough.

What Won't Be Accepted

  • Third-party npm dependencies in production code. capture.js uses puppeteer — that's already a debt. Don't add more.
  • Hardcoded SVG coordinates. Everything must use Mermaid — no <rect x="..." y="...">.
  • Breaking the template. The HTML template in SKILL.md is the core output format. Changes must keep: data-source snapshot before mermaid.initialize(), prefers-reduced-motion, dark mode CSS vars, and the copyMermaid / toggleTheme pattern.
  • Renaming classDef colors. Other files depend on :::yellow, :::blue, etc.

Running Tests

npm install
npx playwright install chromium
npm test              # headless
npm run test:ui       # Playwright UI mode
npm run test:headed   # visible browser

Screenshots are saved to tests/screenshots/ (gitignored) after each run.

File Map

SKILL.md                  ← core skill (loaded on every invocation)
references/               ← loaded on demand
  diagram-types.md        ← type → keyword → example lookup
  dark-mode.md            ← dark mode token reference
  theming.md              ← custom brand theming guide
  animated.md             ← SVG animation classes (non-Mermaid only)
  astro-component.md      ← varkart.dev Astro tokens, component template, React/TSX output
examples/                 ← live rendered output files
capture.js                ← PNG/SVG/PDF/GIF/OG export (Node + puppeteer)
step-through.js           ← sequential reveal UI
hover.js                  ← hover dim/highlight
tests/                    ← Playwright validation suite

Read the full file on GitHub · 50 lines

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. 1mo ago First seen · 50 lines · 619 tokens per session scan A ac9dd40dac4e

Subscribe to this mod's changes

visualcave CLAUDE.md is an instructions file published in the GitHub repository varkart/visualcave (2 stars, last pushed 1mo ago), licensed MIT. It adds 619 tokens to every session, about $0.0025 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.

Claude Codeagent-skillcursordiagramgemini-clihtml
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