webclaw is a web-content extraction tool that turns webpages into clean Markdown, JSON, and context suitable for language models. It is for AI agents and retrieval-augmented applications that need usable content from websites, and can be used through a CLI, REST API, SDKs, or MCP server. The catalogue includes instructions and an MCP integration for connecting compatible agents to it.
Borrowing it
Nothing to install: this file belongs to 0xMassi/webclaw. 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/0xMassi/webclaw/main/CLAUDE.mdgit clone --depth 1 https://github.com/0xMassi/webclawWrote 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/0xmassi/webclaw/claude-md)<a href="https://agentmods.dev/instructions/0xmassi/webclaw/claude-md"><img src="https://agentmods.dev/badge/instructions/0xmassi/webclaw/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/0xmassi/webclaw/claude-md"><img src="https://agentmods.dev/badge/instructions/0xmassi/webclaw/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 | $0.05671 | $0.05671 |
| Opus 5.5 | $0.02268 | $0.02268 |
| Sonnet 5.5 | $0.01134 | $0.01134 |
| Haiku 4.5 | $0.00567 | $0.00567 |
Grade A, and why
webclaw 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 yesterday.
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.
- yesterday Changed 80f1096f2f77
- 3d ago Changed · +152 tokens per session 358b05ecea38
- 8d ago Changed · +58 tokens per session d9d49840abe4
- 17d ago Changed · +6 lines · +331 tokens per session 403fe221f774
- 1mo ago Changed · -46 tokens per session 21fb2a6586e2
- 2mo ago First seen · 276 lines · 5,176 tokens per session scan A f98d519dc068
webclaw CLAUDE.md is an instructions file published in the GitHub repository 0xMassi/webclaw (2,430 stars, last pushed 2d ago), licensed AGPL-3.0. It adds 5,671 tokens to every session, about $0.0227 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.
webclaw CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| webclaw CLAUDE.md0xMassi/webclaw | Instructions file | 2.4k | 2d ago | AGPL-3.0 | A | 5,671 | 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 |