Borrowing it
Nothing to install: this file belongs to f-labs-io/agent-html-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/f-labs-io/agent-html-skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/f-labs-io/agent-html-skillsWrote 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/instructions/f-labs-io/agent-html-skills/claude-md)<a href="https://agentmods.dev/instructions/f-labs-io/agent-html-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/f-labs-io/agent-html-skills/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.
<a href="https://agentmods.dev/instructions/f-labs-io/agent-html-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/f-labs-io/agent-html-skills/claude-md.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 | $0.00901 | $0.00901 |
| Opus 5 | $0.00451 | $0.00451 |
| Sonnet 5 | $0.00180 | $0.00180 |
| Haiku 4.5 | $0.00090 | $0.00090 |
Grade A, and why
agent-html-skills 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 5d 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 — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
agent-html-skills — conventions for Claude Code
Versioning (required)
Always bump the plugin version on every update — never ship changed code under the same version string.
- The version lives in
plugins/html-skills/.claude-plugin/plugin.json→"version". - Every skill's
SKILL.mdfrontmatter carries the same version inmetadata.version(ecosystem sites read individual skills, so per-skill versions must match the plugin version). Don't edit the 19 files by hand — runpython3 scripts/sync-skills.py --set X.Y.Zto bump plugin.json and stamp every skill in one step (or--writeto re-sync after a manual plugin.json bump). The script has no third-party dependencies. - Bump the minor (
x.Y.0) for new skills or any behaviour/instruction change; bump the patch (x.y.Z) for small fixes (typos, tiny tweaks). Never reuse a released version. - Update
plugins/html-skills/CHANGELOG.mdin the same change. - After the release merges to
main, tag it:git tag vX.Y.Z && git push origin vX.Y.Z(matches the existingv1.0.0tag convention). - This bump is also load-bearing for skills.sh: it re-audits a skill only when the version string changes, so bumping is what refreshes the security badges.
- Do not confuse this with the submit-payload
version: 1inside the interactive skills'SKILL.md/submit-handler.js— that is the JSON envelope schema version and is unrelated to the plugin release version.
Shared skill sections (single-sourced)
Every content skill repeats the same ## Pre-flight, ## HTML output foundation, and
(interactive skills only) ## Submit pipeline sections verbatim, because skills load
independently and skills.sh reads one SKILL.md at a time. Don't edit those copies:
- The templates live in
plugins/html-skills/assets/blocks/{preflight,foundation,submit}.md. - Each copy sits between
<!-- block:NAME -->…<!-- /block:NAME -->markers. - Edit the template, then run
python3 scripts/sync-skills.py --writeto push it into every skill.--check(run by CI) fails on any drift, on an unbraced$CLAUDE_PLUGIN_ROOT, on anamethat doesn't match the skill directory, on adescriptionover 1,024 characters (skills.sh limit), or ondescription+when_to_useover 1,536 characters (Claude Code truncates the pair in the skill listing).
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.
- 5d ago Changed · +34 lines · +497 tokens per session 65a46437bb9f
- 9d ago First seen · 26 lines · 404 tokens per session scan A 5a7714f8862c
agent-html-skills CLAUDE.md is an instructions file published in the GitHub repository f-labs-io/agent-html-skills (55 stars, last pushed 6d ago), licensed MIT. It adds 901 tokens to every session, about $0.0045 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 2026-08-30.
Other instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.