MCP server

409acost Site Official

com.409acost/site

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

409A Cost: the site's own MCP server — calculator, enquiry (enquiry = a human handoff, not a...

Website

At a glance

Type

MCP server

Publisher

409acost.com (verified by the MCP Registry)

Status

Working at last check

Tools

5

Token cost

About 1,002 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http site https://409acost.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.site]
url = "https://409acost.com/mcp"

Gemini CLI

{"mcpServers":{"site":{"httpUrl":"https://409acost.com/mcp"}}}

Cursor

{"mcpServers":{"site":{"url":"https://409acost.com/mcp"}}}

VS Code

{"servers":{"site":{"type":"http","url":"https://409acost.com/mcp"}}}

Antigravity

agy mcp add site https://409acost.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"site","server_url":"https://409acost.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"site","server_url":"https://409acost.com/mcp"}

Tools

• calculate ~252 tokens
  Run the 409A valuation budget calculator calculator: 409A valuations to budget for; Appraisal fees at your quoted price; Expedite premium; Total 409A spend over the horizon. Missing inputs fall back to their documented defaults.
• calculator_describe ~81 tokens
  The inputs this calculator takes (with units, ranges and defaults), the outputs it returns, and the assumptions and tables behind it.
• enquiry_describe ~124 tokens
  Read first. States plainly what submit_enquiry does on 409A Cost: it starts an enquiry with human providers who quote directly. Nothing is bought, ordered or paid; no quote is guaranteed; it is free. Also returns who receives the details, the consent wording, and how the person confirms.
• enquiry_fields ~92 tokens
  Every field of the 409A Cost enquiry: key, label, type, whether required, help text and the allowed options where there are any. Pass answers to submit_enquiry keyed by field key.
• submit_enquiry ~453 tokens
  Submits an enquiry to 409A Cost — NOT a purchase, NOT a guaranteed quote. Step 1: call with the answers (keyed by field key from enquiry_fields) and consent=true; it validates and returns a summary, the consent line and a confirmation token — show the person the summary and the consent line. Step 2:

Browse

• Email

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