Nylon MCP server

The Nylon MCP server connects the AI assistant you already use to Nylon’s library of New Zealand and Australian tax and law, and UK tax. The assistant searches the library, reads the source, and cites it in its answer.

MCP (Model Context Protocol) is the open standard AI assistants use to connect to outside tools. You add Nylon once, and your assistant can then search and read Nylon’s library while it answers.

It’s built for accountants, tax advisers and lawyers who already draft in Claude, ChatGPT or Copilot. Instead of answering a tax question from memory, the assistant checks the legislation, cases and guidance in Nylon first, and links each point to its source.

At a glance

Item	Detail
Endpoint	https://mcp.usenylon.com/mcp
Transport	Streamable HTTP, MCP versions 2024-11-05 to 2025-11-25
Sign-in	OAuth 2.1 with PKCE, using your own Nylon account. See Authentication.
Tools	search_library and read_document. Both are read-only.
Who can connect	Nylon users with an Adviser or Elite seat on a current plan. Starter seats don’t include AI-assistant connections. Check your seat under Account → Products & Billing in Nylon.
Cost	Included with the seat.
Library	Legislation, cases and commentary (including government guidance) for New Zealand and Australia, and UK tax.

Read-only

The tools search and read Nylon’s library. They can’t see your chat history, folders or saved work, and they can’t change anything in your account.

How it works

1. You add the endpoint to your assistant once.
2. You sign in to Nylon and choose Allow access. The assistant can now use Nylon’s tools on your behalf.
3. You ask a question. The assistant calls search_library to find the relevant provisions, cases and guidance.
4. It reads the source. For detail, it calls read_document to read within a result.
5. It answers with citations. Each cited point links to the source in Nylon.

Get connected

QuickstartConnect an assistant and run your first cited search.

ClaudeClaude on the web, desktop and mobile.

ChatGPTInstall the Nylon app, or add it by URL.

Microsoft Copilot StudioAdd Nylon to an agent, then share it in Microsoft 365 Copilot.

Learn more

• Tools: what each tool does, its parameters and its output.
• Security and data: what we log, where data goes and how to disconnect.
• Troubleshooting: fixes for the common problems.
• Changelog: what’s changed and when.