Borrowing it
Nothing to install: this file belongs to hamr0/barebrowse. 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/hamr0/barebrowse/main/CLAUDE.mdgit clone --depth 1 https://github.com/hamr0/barebrowseWrote 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/hamr0/barebrowse/claude-md)<a href="https://agentmods.dev/instructions/hamr0/barebrowse/claude-md"><img src="https://agentmods.dev/badge/instructions/hamr0/barebrowse/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/hamr0/barebrowse/claude-md"><img src="https://agentmods.dev/badge/instructions/hamr0/barebrowse/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 | $0.00534 | $0.00534 |
| Opus 5.5 | $0.00214 | $0.00214 |
| Sonnet 5.5 | $0.00107 | $0.00107 |
| Haiku 4.5 | $0.00053 | $0.00053 |
Grade A, and why
barebrowse 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 — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dev Rules
POC first. Always validate logic with a ~15min proof-of-concept before building. Cover happy path + common edges. POC works → design properly → build with tests. Never ship the POC.
Build incrementally. Break work into small independent modules. One piece at a time, each must work on its own before integrating.
Dependency hierarchy — follow strictly: vanilla language → standard library → external (only when stdlib can't do it in <100 lines). External deps must be maintained, lightweight, and widely adopted. Exception: always use vetted libraries for security-critical code (crypto, auth, sanitization).
Lightweight over complex. Fewer moving parts, fewer deps, less config. Simple > clever. Readable > elegant.
Open-source only. No vendor lock-in. Every line of code must have a purpose — no speculative code, no premature abstractions.
Project Specifics
- What: Vanilla JS library — CDP-direct browsing for autonomous agents. URL in, pruned ARIA snapshot out.
- Language: Vanilla JavaScript, ES modules, no runtime build step (JSDoc→
.d.tstypes generated at publish only) - Runtime: Node.js >= 22 (built-in
node:sqlitefor reading cookie DBs) - Protocol: CDP (Chrome DevTools Protocol) direct — no Playwright
- Browser: Any installed Chromium-based browser (chromium, chrome, brave, edge)
- Modules: ~16 files in
src/. Two runtime deps:ws(CDP transport — Node's built-in WebSocket caps messages ~3MB and tears down the socket) and@mozilla/readability(readable()article extraction). Both vetted/lightweight per the dependency rule. - Tests: 160+ passing — run with
node --test test/unit/*.test.js test/integration/*.test.js - Docs:
docs/README.md(navigation guide to all documentation)
@.claude/remember/MEMORY.md
Standards guide (read when designing/building something new, not hot context): .claude/remember/AGENT_RULES.md
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 · 534 tokens per session scan A 98f3449c960c
barebrowse CLAUDE.md is an instructions file published in the GitHub repository hamr0/barebrowse (46 stars, last pushed 7d ago), licensed Apache-2.0. It adds 534 tokens to every session, about $0.0021 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.
barebrowse CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| barebrowse CLAUDE.mdhamr0/barebrowse | Instructions file | 46 | 7d ago | Apache-2.0 | A | 534 | 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 | yesterday | 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 |