Borrowing it
Nothing to install: this file belongs to chadkunsman/netbox_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/chadkunsman/netbox_mcp/master/CLAUDE.mdgit clone --depth 1 https://github.com/chadkunsman/netbox_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/chadkunsman/netbox_mcp/claude-md)<a href="https://agentmods.dev/instructions/chadkunsman/netbox_mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chadkunsman/netbox_mcp/claude-md.svg" alt="Measured on agentmods" 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 | $0.07780 | $0.07780 |
| Opus 5 | $0.03890 | $0.03890 |
| Sonnet 5 | $0.01556 | $0.01556 |
| Haiku 4.5 | $0.00778 | $0.00778 |
Grade A, and why
netbox_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 6d 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 — 740 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 read-only FastMCP server that exposes NetBox API functionality to AI systems via the Model Context Protocol (MCP). The server provides comprehensive access to devices, sites, circuits, VLANs, and IP prefixes, enabling natural language queries about network infrastructure in a NetBox instance without allowing any modifications to the NetBox data.
FastMCP servers act as bridges between AI applications (like Claude, ChatGPT) and your APIs or services, allowing AI systems to discover and use your tools intelligently.
Implementation Notes
The server strictly enforces read-only access through a custom ReadOnlyAdapter that blocks any non-GET HTTP requests to the NetBox API. This ensures that AI systems can query device information but cannot make any changes to the infrastructure data.
Limit Parameter Handling
Important Implementation Note: The limit parameter in pynetbox's .filter() method controls pagination (records per HTTP request) rather than total results returned. By design, pynetbox automatically fetches all pages until it retrieves every matching record, regardless of the limit value.
To ensure tools respect the documented limits (default 50, max 1000), the MCP server implements manual enumeration that breaks iteration after the specified number of records. This prevents excessive LLM context usage while maintaining expected behavior.
This is a known limitation of the pynetbox library, not the NetBox API itself, which does support proper limit functionality.
Available Tools
The MCP server provides eighteen main tools:
Device Tools:
get_devices: Accepts structured filter parameters to query devices with specific attributesget_device: Retrieves detailed information about a single device by nameask_about_devices: Accepts natural language queries and converts them to appropriate API calls
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.
- 6d ago First seen · 740 lines · 7,780 tokens per session scan A 27a6cf7f50cf
netbox_mcp CLAUDE.md is an instructions file published in the GitHub repository chadkunsman/netbox_mcp (0 stars, last pushed 3mo ago), licensed MIT. It adds 7,780 tokens to every session, about $0.0389 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 2026-09-01.
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