What is mcp-nautobot CLAUDE.md?

A project instruction file for Claude Code, explaining how to develop and operate an MCP server that retrieves IP address data from Nautobot. Nautobot is a system for managing network infrastructure and IP addresses.

Use it when installing dependencies, running, building, testing, formatting, type-checking, or debugging the mcp-nautobot server.

It gives the coding agent the project’s setup details, commands, environment variables, and architecture in one place.

How aiopnet/mcp-nautobot configures Claude Code

Reuse

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.

Copy the file

curl -O https://raw.githubusercontent.com/aiopnet/mcp-nautobot/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/aiopnet/mcp-nautobot

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/aiopnet/mcp-nautobot/claude-md/github.svg)](https://agentmods.dev/instructions/aiopnet/mcp-nautobot/claude-md)

Your own site

<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.

Your own site · 80×15

<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>

Per session 656 This file is loaded in full into every session.

When invoked 656 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00656	$0.00656
Opus 5.5	$0.00262	$0.00262
Sonnet 5.5	$0.00131	$0.00131
Haiku 4.5	$0.00066	$0.00066

Measured 2mo ago against content hash b1499a31c85c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo 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 · 65 lines

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

Read the full file on GitHub · 65 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.

2mo ago First seen · 65 lines · 656 tokens per session scan A b1499a31c85c

Subscribe to this mod's changes

mcp-nautobot CLAUDE.md is an instructions file published in the GitHub repository aiopnet/mcp-nautobot (1 stars, last pushed 1mo ago), licensed MIT. It adds 656 tokens to every session, about $0.0026 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 2026-08-31.

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mcp-nautobot: Instructions file for Claude Code