Borrowing it
Nothing to install: this file belongs to simpx/loopat. 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/simpx/loopat/main/CLAUDE.mdgit clone --depth 1 https://github.com/simpx/loopatWrote 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/simpx/loopat/claude-md)<a href="https://agentmods.dev/instructions/simpx/loopat/claude-md"><img src="https://agentmods.dev/badge/instructions/simpx/loopat/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/simpx/loopat/claude-md"><img src="https://agentmods.dev/badge/instructions/simpx/loopat/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 | $0.00708 | $0.00708 |
| Opus 5.5 | $0.00283 | $0.00283 |
| Sonnet 5.5 | $0.00142 | $0.00142 |
| Haiku 4.5 | $0.00071 | $0.00071 |
Grade A, and why
loopat 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.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
loopat
Self-hosted AI workspace built around context management. Monorepo with two workspaces: server/ (Hono + Bun) and web/ (React 19 + Vite + Tailwind v4).
Tech stack
- Runtime: Bun (server + build tooling)
- Server: Hono, TypeScript, Claude Agent SDK, podman (sandbox containers)
- Web: React 19, Vite 8, Tailwind CSS v4, Zustand, assistant-ui, xterm.js, CodeMirror, Milkdown
- Infra: Docker (oven/bun base), rootless podman inside container
- Tests: Playwright (e2e + dogfood)
- Rust: Two small binaries in
server/src/serve-rsandserver/src/port-proxy-rs, built as part ofweb build
Development
bun run dev # start server + web concurrently (localhost)
bun run dev:host # same but bind 0.0.0.0
bun run dev:server # server only
bun run dev:web # web only
Server default port: 10001. Vite dev default port: 5173.
Push directly to main — no PR workflow for daily development.
Testing
The must-run test suite is the dogfood e2e tests — they boot a real stack (podman sshd container + backend + Vite + real AI) and drive a browser through it.
# Full dogfood suite (requires podman + ANTHROPIC_API_KEY)
bun run dogfood
# Smoke subset (first-5-minutes scenarios)
bun run dogfood:smoke
# Individual suites
bun run dogfood:first-run
bun run dogfood:journey
bun run dogfood:sync
Prerequisites: podman installed, ANTHROPIC_API_KEY exported. Missing either = hard fail (never skip).
There's also a lighter e2e/ suite that uses mocked backends:
bun run test:e2e
Build
bun run build # install deps + build web (includes Rust binaries)
bun run build:web # web only (cargo + tsc + vite)
Release
Versions follow 0.1.x. Release flow:
npm version patch # bumps package.json, commits, tags v0.1.x
git push origin main --tags
Pushing a v* tag triggers two GitHub Actions:
- publish.yml — publishes to npm
- docker.yml — builds multi-arch (amd64 + arm64) Docker image to
ghcr.io/simpx/loopat
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 · 85 lines · 708 tokens per session scan A 9c1d1d47271c
loopat CLAUDE.md is an instructions file published in the GitHub repository simpx/loopat (84 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 708 tokens to every session, about $0.0028 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 2026-08-30.
loopat CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| loopat CLAUDE.mdsimpx/loopat | Instructions file | 84 | 4mo ago | Apache-2.0 | A | 708 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |