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OKC HVAC Calculator | Repair or Replace Decision Tool

io.github.janoliverautomation-stack/okchvaccalculator-com in the official MCP registry. Endpoint https://okchvaccalculator.com/mcp.

The registry describes it as: Use the free OKC HVAC Calculator to see whether repairing or replacing your heating or air system ma

We read its 8 tools on 2026-10-28. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.

A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

Claude Code

claude mcp add --transport http okchvaccalculator-com https://okchvaccalculator.com/mcp

Cursor: ~/.cursor/mcp.json

{
  "mcpServers": {
    "okchvaccalculator-com": {
      "url": "https://okchvaccalculator.com/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"okchvaccalculator-com","type":"http","url":"https://okchvaccalculator.com/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which. The free lazaretto-guard plugin reads a server's tools the moment Claude Code adds it and asks you if one of our rules matches.

Tools it advertises

get_okc_hvac_business_info get_repair_or_replace_tool_info run_hvac_repair_or_replace_analysis search_hvac_decision_content get_hvac_article get_okc_hvac_service_area submit_covington_lead_request submit_covington_booking_request

Run this server? Show the check in your README

The badge reflects the latest weekly read:

Markdown

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-janoliverautomation-stack-okchvaccalculator-com/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-janoliverautomation-stack-okchvaccalculator-com)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.