Borrowing it
Nothing to install: this file belongs to teng-lin/agent-fetch. 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/teng-lin/agent-fetch/main/CLAUDE.mdgit clone --depth 1 https://github.com/teng-lin/agent-fetchWrote 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/teng-lin/agent-fetch/claude-md)<a href="https://agentmods.dev/instructions/teng-lin/agent-fetch/claude-md"><img src="https://agentmods.dev/badge/instructions/teng-lin/agent-fetch/claude-md.svg" alt="Measured on agentmods" 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 | $0.01096 | $0.01096 |
| Opus 5 | $0.00548 | $0.00548 |
| Sonnet 5 | $0.00219 | $0.00219 |
| Haiku 4.5 | $0.00110 | $0.00110 |
Grade A, and why
agent-fetch 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 6d 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 — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md — agent-fetch
Full-content web fetcher and article extractor for AI agents. Browser impersonation (httpcloak) with multi-strategy content extraction.
Commands
npm run lint # ESLint with typescript-eslint
npm run format:check # Prettier check
npm run format # Prettier write
npm run test # Unit tests only (excludes e2e)
npm run test:e2e # E2E tests (hit real sites, flaky — don't run in CI)
npm run build # TypeScript compilation
Before Committing or Creating a PR
Do not create a PR without explicit user confirmation. Always ask before running gh pr create.
Run all checks — all four must pass:
npm run lint && npm run format:check && npm run test && npm run build
If format:check fails, run npm run format and re-stage.
Worktree Workflow
Never modify files directly on the main branch. All feature work, bug fixes, and changes must be done in a git worktree. When asked to implement something, always create a worktree first.
After creating a git worktree for feature work, immediately cd to the worktree directory before running any commands or making changes. This ensures you're working in the correct isolated context, not the main repository.
git worktree add .worktrees/<name> -b feature/<name>
cd .worktrees/<name>
Project Structure
src/
cli.ts # CLI entry point (5 output modes: default, --json, --raw, --text, -q)
index.ts # Public API exports
logger.ts # Pino logging
fetch/ # HTTP client with browser impersonation
http-client.ts # Low-level HTTP via httpcloak
http-fetch.ts # High-level fetch orchestrator
content-validator.ts # Response validation (challenge pages, content types)
types.ts
extract/ # Multi-strategy content extraction
content-extractors.ts # Strategies: Next.js, JSON-LD, Readability, CSS selectors, text-density, RSC
utils.ts # Extraction helpers
types.ts
sites/ # Site-specific configurations
site-config.ts # Per-site config (AGENT_FETCH_SITES_JSON)
__tests__/ # Vitest unit tests
fixtures/ # Test data
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.
- 6d ago First seen · 102 lines · 1,096 tokens per session scan A 56e22126de7a
agent-fetch CLAUDE.md is an instructions file published in the GitHub repository teng-lin/agent-fetch (307 stars, last pushed 5mo ago), licensed MIT. It adds 1,096 tokens to every session, about $0.0055 per session on Opus 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.
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