Borrowing it
Nothing to install: this file belongs to zenjoy/realtime-register-mcp. 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/zenjoy/realtime-register-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/zenjoy/realtime-register-mcpWrote 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/zenjoy/realtime-register-mcp/claude-md)<a href="https://agentmods.dev/instructions/zenjoy/realtime-register-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/zenjoy/realtime-register-mcp/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/zenjoy/realtime-register-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/zenjoy/realtime-register-mcp/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 | $0.01062 | $0.01062 |
| Opus 5 | $0.00531 | $0.00531 |
| Sonnet 5 | $0.00212 | $0.00212 |
| Haiku 4.5 | $0.00106 | $0.00106 |
Grade A, and why
realtime-register-mcp 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 9d 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 — 131 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.
Project Overview
This is a Model Context Protocol (MCP) server that integrates AI assistants with the RealtimeRegister API for domain management operations. The server provides domain availability checking, bulk domain processing, and API connectivity testing through MCP tools.
Core Commands
Development Commands
yarn build- Compile TypeScript to JavaScript in dist/yarn dev- Run server in development mode with tsx hot reloadingyarn type-check- Run TypeScript type checking without compilationyarn test- Run Jest test suiteyarn test:watch- Run tests in watch modeyarn test:coverage- Generate test coverage reportyarn clean- Remove compiled dist/ directory
Production Commands
yarn start- Run compiled server from dist/
Architecture Overview
Project Structure (Feature-Based)
src/
├── core/ # Core server and configuration
├── api/ # RealtimeRegister API clients
├── cache/ # Caching infrastructure
└── monitoring/ # Performance and reliability
Core Module (src/core/)
Server Architecture (core/server.ts)
RealtimeRegisterMCPServer- Main MCP server class using stdio transport- Provides 3 MCP tools:
check_domain_availability,check_bulk_domains,test_api_connection - Lazy initialization pattern for API client (starts without configuration)
Configuration (core/config.ts)
- Functional configuration loading with validation
- Environment variables with sensible defaults
- Type-safe configuration management
Error Handling (core/errors.ts)
- Custom error hierarchy with proper inheritance
- Specific error types: ConfigurationError, ValidationError, ApiError, NetworkError, MCPError
- Proper error chaining and context preservation
Utilities (core/utils.ts)
- Functional programming utilities (pipe, compose, retry, timeout)
- Type-safe Result type for error handling
- Common type guards and validation functions
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.
- 9d ago First seen · 131 lines · 1,062 tokens per session scan A 3b7154ef68c1
realtime-register-mcp CLAUDE.md is an instructions file published in the GitHub repository zenjoy/realtime-register-mcp (1 stars, last pushed 8mo ago), licensed MIT. It adds 1,062 tokens to every session, about $0.0053 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 instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.