Borrowing it
Nothing to install: this file belongs to isomorphic-team/isomorphic-app. 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/isomorphic-team/isomorphic-app/main/CLAUDE.mdgit clone --depth 1 https://github.com/isomorphic-team/isomorphic-appWrote 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/isomorphic-team/isomorphic-app/claude-md)<a href="https://agentmods.dev/instructions/isomorphic-team/isomorphic-app/claude-md"><img src="https://agentmods.dev/badge/instructions/isomorphic-team/isomorphic-app/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/isomorphic-team/isomorphic-app/claude-md"><img src="https://agentmods.dev/badge/instructions/isomorphic-team/isomorphic-app/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 | $0.03444 | $0.03444 |
| Opus 5.5 | $0.01378 | $0.01378 |
| Sonnet 5.5 | $0.00689 | $0.00689 |
| Haiku 4.5 | $0.00344 | $0.00344 |
Grade A, and why
isomorphic-app 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 20d 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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 20d ago Changed · +1 lines · +30 tokens per session d21b9895feee
- 28d ago Changed · -2 tokens per session dc68242307d7
- 1mo ago Changed · -1,277 lines · -31,278 tokens per session 5398b45b0f60
- 1mo ago Changed · +10 lines · +991 tokens per session 9f8d84f211c1
- 1mo ago Changed · +222 tokens per session 442c181bcf05
- 1mo ago Changed · +37 lines · +1,749 tokens per session cf5e4172ee02
- 1mo ago Changed · +383 lines · +7,259 tokens per session ba30bbd3fd1c
- 2mo ago First seen · 1,047 lines · 24,473 tokens per session scan A 48e618809542
isomorphic-app CLAUDE.md is an instructions file published in the GitHub repository isomorphic-team/isomorphic-app (2 stars, last pushed 3d ago), licensed AGPL-3.0. It adds 3,444 tokens to every session, about $0.0138 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.
Other instructions, from other repositories
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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.