What is htmlslide CLAUDE.md?

A project-specific instruction file for Claude Code in an HTML slide editor repository. It explains the code layout, available commands, and rules for changing the project.

Use it when editing, testing, building, or reviewing the HTML Slide Studio codebase, including its Markdown, diagrams, assets, exports, and MCP tools.

It gives the coding agent the project context and safety rules needed to make focused changes without breaking existing behavior or exposing private files.

How murasamelabo/htmlslide configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to murasamelabo/htmlslide. 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/murasamelabo/htmlslide/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/murasamelabo/htmlslide

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/murasamelabo/htmlslide/claude-md/github.svg)](https://agentmods.dev/instructions/murasamelabo/htmlslide/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/murasamelabo/htmlslide/claude-md"><img src="https://agentmods.dev/badge/instructions/murasamelabo/htmlslide/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/murasamelabo/htmlslide/claude-md"><img src="https://agentmods.dev/badge/instructions/murasamelabo/htmlslide/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 280 This file is loaded in full into every session.

When invoked 280 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.

Model	Per session	Once invoked
Fable 5.1	$0.00280	$0.00280
Opus 5.5	$0.00112	$0.00112
Sonnet 5.5	$0.00056	$0.00056
Haiku 4.5	$0.00028	$0.00028

Measured 2mo ago against content hash 49b590038017, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

htmlslide 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 2mo 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 · 37 lines

What it actually says

HTML Slide Studio Repository Guide

Commands

npm ci
npm run dev
npm run build
npm test
npm run test:e2e
npm run lint
npm run typecheck
npm run typecheck:mcp
npm run mcp

Architecture

src/App.tsx: browser workspace orchestration
src/editor/: CodeMirror source editor
src/render/: Marp rendering and source mapping
src/mermaid/: Mermaid rendering and passive SVG validation
src/export/: standalone offline HTML generation
src/design/: themes, profiles, and diagnostics
src/assets/: browser folder and local asset handling
mcp/: MCP tools and constrained deck repository

Repository Rules

Keep changes focused and preserve existing public behavior.
Use structured parsers for Markdown-adjacent, HTML, SVG, CSS, and YAML work.
Preserve path, symlink, asset, and offline-export security boundaries.
Never commit customer decks, generated exports, credentials, or local paths.
decks/* is ignored except the generic decks/example-deck fixture.
Use UTF-8 with BOM for text files unless a format explicitly requires otherwise.
Run focused tests after the first edit, then the full validation suite before completion.

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.

2mo ago First seen · 37 lines · 280 tokens per session scan A 49b590038017

Subscribe to this mod's changes

htmlslide CLAUDE.md is an instructions file published in the GitHub repository murasamelabo/htmlslide (0 stars, last pushed 2mo ago), licensed MIT. It adds 280 tokens to every session, about $0.0011 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.

Planning markdown marp mcp mermaid presentations

htmlslide CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
htmlslide CLAUDE.mdmurasamelabo/htmlslide	Instructions file	0	2mo ago	MIT	A	280	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	275k	3d ago	MIT	A	4,313	Codex, OpenCode

htmlslide: Instructions file for Claude Code