Borrowing it
Nothing to install: this file belongs to aiopnet/mcp-nautobot. 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/aiopnet/mcp-nautobot/main/CLAUDE.mdgit clone --depth 1 https://github.com/aiopnet/mcp-nautobotWrote 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/aiopnet/mcp-nautobot/claude-md)<a href="https://agentmods.dev/instructions/aiopnet/mcp-nautobot/claude-md"><img src="https://agentmods.dev/badge/instructions/aiopnet/mcp-nautobot/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/aiopnet/mcp-nautobot/claude-md"><img src="https://agentmods.dev/badge/instructions/aiopnet/mcp-nautobot/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 | $0.00656 | $0.00656 |
| Opus 5 | $0.00328 | $0.00328 |
| Sonnet 5 | $0.00131 | $0.00131 |
| Haiku 4.5 | $0.00066 | $0.00066 |
Grade A, and why
mcp-nautobot 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 — 65 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 an MCP (Model Context Protocol) server that integrates with Nautobot to provide IP address data retrieval capabilities. The server implements comprehensive error handling, rate limiting, and logging for reliable API interactions.
Key Commands
Development
- Run server:
uv run mcp-nautobot-server - Install dependencies:
uv sync - Build package:
uv build - Run tests:
pytest - Run tests with async support:
pytest -v --asyncio-mode=auto - Type checking:
mypy src/ - Format code:
black src/ tests/ - Sort imports:
isort src/ tests/ - Debug with MCP Inspector:
npx @modelcontextprotocol/inspector uv --directory /Users/admin/Documents/projects/mcp-nautobot run mcp-nautobot-server
Environment Setup
Required environment variables:
NAUTOBOT_URL: Base URL for Nautobot instance (e.g., http://localhost:8000)NAUTOBOT_TOKEN: API token for authentication
Architecture
Core Components
-
MCP Server (
src/mcp_nautobot_server/server.py):- Implements MCP protocol handlers for tools, resources, and prompts
- Manages server lifecycle and stdio communication
- Provides 5 main tools: get_ip_addresses, get_prefixes, get_ip_address_by_id, search_ip_addresses, test_connection
- Implements comprehensive error handling for authentication, connection, and API errors
-
Nautobot Client (
src/mcp_nautobot_server/nautobot_client.py):- Async HTTP client using httpx for Nautobot API communication
- Implements rate limiting to prevent API overload
- Pydantic models for IPAddress and Prefix data validation
- Custom exception hierarchy for error handling
Key Design Patterns
- Async/Await: All I/O operations use async patterns for efficient concurrency
- Rate Limiting: Built-in rate limiter prevents overwhelming the Nautobot API
- Error Handling: Specific exception types for different failure modes (authentication, connection, API errors)
- Type Safety: Comprehensive type hints using Pydantic models for API responses
- Configuration: Environment-based configuration using pydantic-settings
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 · 65 lines · 656 tokens per session scan A b1499a31c85c
mcp-nautobot CLAUDE.md is an instructions file published in the GitHub repository aiopnet/mcp-nautobot (1 stars, last pushed 1y ago), licensed MIT. It adds 656 tokens to every session, about $0.0033 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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