Borrowing it
Nothing to install: this file belongs to InDate/devharness. 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/InDate/devharness/main/CLAUDE.mdgit clone --depth 1 https://github.com/InDate/devharnessWrote 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/indate/devharness/claude-md)<a href="https://agentmods.dev/instructions/indate/devharness/claude-md"><img src="https://agentmods.dev/badge/instructions/indate/devharness/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/indate/devharness/claude-md"><img src="https://agentmods.dev/badge/instructions/indate/devharness/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 | $0.00233 | $0.00233 |
| Opus 5.5 | $0.00093 | $0.00093 |
| Sonnet 5.5 | $0.00047 | $0.00047 |
| Haiku 4.5 | $0.00023 | $0.00023 |
Grade A, and why
devharness 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 28d 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.
What it actually says
devharness
Working on this repo, as opposed to using its tools against another app.
CONTRIBUTING.md holds the build, test, hot-reload and release mechanics, and
the devharness-contributing skill holds the code conventions.
A rebuild discards what the running child held in memory
npm run build signals SIGUSR2 from its postbuild hook, and the supervisor
restarts build/index.js. Everything that child held goes with it, not only the
Chrome instances listed under Hot reload in CONTRIBUTING.md:
- The proxy registry (
src/proxy/registry.ts). A proxy started byconnection({ action: 'launch', proxy: true })is gone, and every event it captured with it. - Live connections, so a
connectionresolves to nothing until a freshconnection launch.
A drive that checks a change has to run after the rebuild that carries the
change. Build first, drive second. Rebuilding part-way through a drive discards
the evidence collected so far and returns Connection not found.
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.
- 28d ago Changed · -1 tokens per session 2803719f8493
- 1mo ago Changed · +4 tokens per session a4a9fac322fe
- 1mo ago First seen · 21 lines · 230 tokens per session scan A 9f6fd7a4b17e
devharness CLAUDE.md is an instructions file published in the GitHub repository InDate/devharness (19 stars, last pushed today), licensed MIT. It adds 233 tokens to every session, about $0.0009 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 2026-09-25.
Other instructions, from other repositories
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).
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.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
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.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.