agentmods.dev

hotelzero CLAUDE.md

A project instruction file for HotelZero, an MCP server that searches Booking.com hotels through automated web browsing. It documents commands, tests, and configuration such as proxy settings.

In plain words
What is it for?
Use it when developing HotelZero, running its TypeScript build and test commands, starting the server, or configuring hotel-search browser automation.
Why use it?
It gives coding agents the repository-specific information needed to build, run, test, and maintain the project consistently.

Instructions file

1 6mo ago A scan 1,568 tokens original MIT
View the source file insprd/hotelzero
Install

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.

agentmods
npx agentmods add instructions/insprd/hotelzero/claude-md
Clone the repo
git clone --depth 1 https://github.com/insprd/hotelzero
Per session 1,568 This file is loaded in full into every session.
When invoked 1,568 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.01568 $0.01568
Opus 5 $0.00784 $0.00784
Sonnet 5 $0.00314 $0.00314
Haiku 4.5 $0.00157 $0.00157

Measured 2d ago against content hash 474d08d8dc9c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

hotelzero 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 2d 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.

CLAUDE.md · 173 lines

How it starts

The opening of the file, as written. The whole thing — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Overview

HotelZero is an MCP (Model Context Protocol) server that searches hotels on Booking.com using Playwright browser automation. It provides 80+ filters for precise hotel searches and implements anti-bot detection measures including user agent rotation, session persistence, and proxy support.

Development Commands

# Build
npm run build              # Compile TypeScript to dist/

# Development
npm run dev                # Run server in development mode with tsx

# Testing
npm test                   # Run all tests with vitest
npm run test:watch         # Run tests in watch mode
npm run test:ui            # Open vitest UI
npm run test:search        # Run search tests only
npm run test:details       # Run hotel details tests only
npm run test:reviews       # Run reviews tests only
npm run test:selectors     # Run selector tests only
npm run test:calendar      # Run price calendar tests only

# Production
npm start                  # Run the built server (requires build first)

Environment Variables

  • HOTELZERO_PROXY: Proxy server URL (HTTP or SOCKS5, with optional auth)
  • HOTELZERO_LOG_LEVEL: Log verbosity (trace, debug, info, warn, error, fatal, silent)
  • HOTELZERO_SESSION_PATH: Custom session file location (default: ~/.hotelzero/session.json, empty string to disable)

Architecture

Core Components

src/index.ts - MCP server implementation

  • Defines 8 MCP tools: find_hotels, search_hotels, get_hotel_details, check_availability, get_reviews, get_price_calendar, compare_hotels, get_hotel_images
  • Implements Zod schemas for input validation
  • Handles tool routing and error formatting
  • Server runs on stdio transport for MCP communication

src/browser.ts - Playwright automation engine

  • HotelBrowser class manages browser lifecycle and session persistence
  • Filter code mappings: 20+ categories mapping friendly names to Booking.com's nflt URL parameters
  • User agent rotation: 14 realistic browser profiles
  • Session management: Saves/loads cookies and localStorage to reduce CAPTCHA challenges
  • Retry logic: Exponential backoff with jitter for transient failures
  • Custom error types: HotelSearchError with error codes and retryable flags

Read the full file on GitHub · 173 lines

Changes

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.

  1. 2d ago First seen · 173 lines · 1,568 tokens per session scan A 474d08d8dc9c

Subscribe to this mod's changes

hotelzero CLAUDE.md is an instructions file published in the GitHub repository insprd/hotelzero (1 stars, last pushed 6mo ago), licensed MIT. It adds 1,568 tokens to every session, about $0.0078 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.

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