Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add rules/cosmocoder/mcp-web-docs/cursorrulesgit clone --depth 1 https://github.com/cosmocoder/mcp-web-docsWhat 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 | $0.00842 | $0.00842 |
| Opus 5 | $0.00421 | $0.00421 |
| Sonnet 5 | $0.00168 | $0.00168 |
| Haiku 4.5 | $0.00084 | $0.00084 |
Grade A, and why
cursorrules 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.
How it starts
The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cursor Rules for MCP Web Docs
This is a TypeScript MCP (Model Context Protocol) server project for crawling and indexing web documentation.
Quick Reference
For comprehensive guidelines, see AGENTS.md in the project root.
Project Overview
MCP Web Docs is a self-hosted MCP server that:
- Crawls and indexes documentation from any website
- Provides hybrid search (full-text + semantic/vector)
- Supports authentication for protected documentation sites
- Uses local embeddings (FastEmbed) for privacy
Tech Stack
- Runtime: Node.js >= 24, npm >= 11
- Language: TypeScript (ES2022, NodeNext modules)
- Testing: Vitest
- Storage: SQLite (metadata) + LanceDB (vectors)
Essential Rules
Code Style
- TypeScript with strict mode enabled
- Always use
.jsextensions in imports (ESM requirement) - Follow existing patterns in the codebase
- Run
npm run lintandnpm run prettierbefore committing
Testing
- Tests are co-located:
*.test.tsnext to source files - Use Vitest globals:
describe,it,expect,vi - Mock embeddings:
createMockEmbeddings()fromsrc/__mocks__/embeddings.ts - Use
vi.hoisted()for mocks configured before imports
Critical Constraints
- Never log to stdout - MCP servers use stdio for JSON-RPC
- Use logger from
src/util/logger.ts(writes to stderr) - Validate inputs with Zod schemas from
src/util/security.ts - Use
validatePublicUrl()for SSRF protection
Key Commands
npm test # Run tests
npm run build # Build TypeScript
npm run lint # Run ESLint
npm run prettier # Format code
npm run test:coverage # Test with coverage
npm run test:types # Type check
File Structure
src/
├── index.ts # CLI bootstrap and signal handling
├── server.ts # MCP server and tool handlers
├── crawler/ # Web crawling (Playwright/Crawlee)
├── processor/ # Content processing
├── storage/ # SQLite + LanceDB
├── embeddings/ # FastEmbed vectors
├── indexing/ # Workflow, status tracking, queue management
└── util/ # Logger, security, helpers
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 First seen · 91 lines · 842 tokens per session scan A 341b4bb47681
cursorrules is a cursor rule published in the GitHub repository cosmocoder/mcp-web-docs (1 stars, last pushed 7d ago), licensed MIT. It adds 842 tokens to every session, about $0.0042 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 2026-08-31.
Other cursor rules, from other repositories
angular-20
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dev-standard
Apache Superset development standards and guidelines for Cursor IDE.
typescript
Changes to these high-fan-out internals can affect every message, delta, element, or rerun. Keep work in them minimal, and benchmark changes with representative stress-test apps.
coolify-ai-docs
Master reference to all Coolify AI documentation in .ai/ directory.
python_lib
Tips and guidelines specific to the development of the Streamlit Python library, not applicable to scripts and e2e tests.
specs
This directory contains product and tech specs for Streamlit features.