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didah: Instructions file for Claude Code

CLAUDE.md

didah CLAUDE.md is an instructions file for Claude Code from physicsrob/didah. It costs 1,186 tokens per session, scanned A, original, MIT.

Repository instructions for didah, a Morse-code learning web app with timing feedback, statistics, and different study modes.

In plain words
What is it for?
Use them when developing didah to run the local app, tests, type checks, linting, builds, and Cloudflare Pages deployment.
Why use it?
They explain the app's structure, development commands, quality checks, and deployment process so changes can be made and verified consistently.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions Claude Code.

This is physicsrob/didah's own configuration. It tells Claude Code how to work on didah 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 didah configures →

not rated 2repo 12mo ago A scan 1,186 tokens original MIT
View source ↗ physicsrob/didah
Reuse

Borrowing it

Nothing to install: this file belongs to physicsrob/didah. 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/physicsrob/didah/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/physicsrob/didah

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.

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README.md
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Your own site
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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.

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Per session 1,186 This file is loaded in full into every session.
When invoked 1,186 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 $0.01186 $0.01186
Opus 5.5 $0.00474 $0.00474
Sonnet 5.5 $0.00237 $0.00237
Haiku 4.5 $0.00119 $0.00119

Measured 2mo ago against content hash 9499216be139, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

didah 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 · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude Code Configuration

This file contains configuration and context for working with didah using Claude Code.

Project Overview

A modern web application for learning Morse code with real-time feedback, statistics tracking, and multiple study modes. Built with React + TypeScript + Vite, deployed on Cloudflare Pages.

Live App: https://didah.app

Development Commands

# Development
npm run dev          # Start Cloudflare dev server (app + API on localhost:3000)
npm run dev:vite    # Start Vite only (no API on localhost:5173)
npm test            # Run all tests (watch mode)
npm run test:ui     # Interactive test UI
npm run build       # Build for production

# Quality Checks (run these before committing!)
npm run check       # Run ALL checks: TypeScript, ESLint, and tests
npm run check:fix   # Same as check but auto-fix lint issues
npm run typecheck   # TypeScript type checking only
npm run lint        # ESLint only

# Deployment
# Note: Cloudflare Pages automatically builds and deploys on git push
npm run deploy      # Manual deployment (alternative to automatic)

Architecture

  • Core Domain: src/core/ - Timing engine, alphabet, types
  • Runtime System: src/features/session/runtime/ - Session orchestration
  • Modes: src/features/session/modes/ - Mode implementations (Letter Practice, Listen, Live Copy, Head Copy, Dit Dash)
  • Services: src/features/session/services/ - Audio, feedback
  • Pages: src/pages/ - React components
  • API Functions: functions/api/ - Cloudflare Pages Functions

Styling Approach

IMPORTANT: This project uses regular CSS files with class names. We do NOT use Tailwind CSS.

  • Style files are in src/styles/ and component-specific CSS files
  • Main styles: src/styles/main.css (CSS variables, base styles)
  • Component styles: src/components/ComponentName.css
  • Page styles: src/styles/pageName.css
  • Write semantic class names, not utility classes
  • Use the CSS variables defined in main.css for colors and spacing
  • See brand.md for design guidelines

Read the full file on GitHub · 113 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. 2mo ago First seen · 113 lines · 1,186 tokens per session scan A 9499216be139

Subscribe to this mod's changes

didah CLAUDE.md is an instructions file published in the GitHub repository physicsrob/didah (2 stars, last pushed 12mo ago), licensed MIT. It adds 1,186 tokens to every session, about $0.0047 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.

Related

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