mays.co MCP Server

This site runs a Model Context Protocol (MCP) server for your AI assistant. Connect it, and your assistant can run the retirement simulator, search Warren Buffett’s letters, and read the posts here.

https://api.mays.co/mcp

Read-only. No sign-in, no API key, no account.

Connect your assistant

Claude Code

Run this in a terminal. Then start claude and ask one of the questions below.

claude mcp add --transport http mays-co https://api.mays.co/mcp

Claude (web and desktop)

  1. Open Customize › Connectors › Add custom connector.
  2. Paste the URL.
  3. Choose No sign in.

The Free plan allows 1 custom connector. On Team and Enterprise plans, an Owner must add it.

ChatGPT

  1. Turn on Developer mode in ChatGPT’s settings.
  2. Add an app and paste the URL.

Developer mode is a beta for paid plans, on the web only. OpenAI moves this menu often, so search settings for it.

Cursor

Add to Cursor

Cursor opens and asks you to confirm the server.

VS Code

Install in VS Code

VS Code opens and asks you to install the server.

What your assistant can do

Your assistant picks a tool when a question needs one.

5 tools

  • simulate_retirement

    Runs the Monte Carlo retirement simulator for a withdrawal rate, a time span, and a stock share.

    Ask: “How often does a 4% withdrawal rate run out of money over 30 years at 60% stocks?”

    Open the retirement simulator
  • search_buffett_letters

    Searches Warren Buffett’s Berkshire Hathaway shareholder letters and returns passages with their year.

    Ask: “When does Buffett think a share buyback makes sense?”

    Ask on the Ask Warren page
  • list_posts

    Lists the posts on this site with their title, date, category, and tags.

    Ask: “What has Steven written about coding with AI?”

  • get_post

    Returns one post as Markdown, with links that work outside this site.

    Ask: “Summarize Steven’s post on catastrophic financial risks.”

  • about_steven

    Returns a short profile of Steven Mays and his work.

    Ask: “What does Steven Mays build, and with what stack?”

2 prompts

Your client lists these in its prompt or slash-command menu.

  • stress_test_retirement

    Guides your assistant through simulator runs that test how a retirement plan holds up.

    Ask: “Stress-test retiring at 50 on $1.5 million, spending $60,000 a year.”

  • ask_warren

    Has your assistant answer from Buffett’s letters and cite the year of each passage it uses.

    Ask: “How does Buffett decide when a business has a durable moat?”

Live inspector

Each button sends a real request from your browser. Protocol 2026-07-28 has no handshake and no session, so each request carries its version and client info in _meta.

Request

Choose a call above to send it.

Response

The reply appears here with its HTTP status and latency.

Your assistant’s model writes every answer. This server only computes and retrieves, so it costs almost nothing to run.