What is MCP? A plain-English explanation, with real estate examples

By the Goliath research team · Checked November 12, 2026

What is MCP? It's an open standard (Model Context Protocol) that lets AI apps like Claude and ChatGPT use other software for you.

[Top button: See an MCP do real work → demo link above]

What is MCP, in one sentence?

MCP is a common plug that lets any AI assistant use any tool that offers one. Through MCP "servers", the AI looks things up and acts in your tools, not only from training.

What happens as a request flows through MCP?

You ask a question, and the AI checks which tools its connected MCP servers offer. It picks one and sends a structured request.

The AI reads your question and sees it can't answer from memory.
It looks at its tools. Each MCP server lists what it can do: "search properties", "get signals", "look up owners".
It picks a tool and fills it in: county Shelby, state Tennessee, signal pre-foreclosure, last 30 days.
The MCP server runs that request against the real data, using your account.
The results come back to the AI, which writes you a normal answer, such as addresses and filing dates.
If the job needs more steps, the AI keeps going.

Servers, clients and tools: the three words you'll hear

MCP has a handful of terms. You only need three.

MCP server: the piece the software company provides. It tells AI apps what they may do with its product.
MCP client: the AI app you use, such as Claude, ChatGPT, Cursor or Claude Code. In Claude and ChatGPT, these connections are called connectors; see Claude connectors.
Tools: the single actions a server offers, such as "search properties", "get comps" or "add note".

A server offers tools, a client connects to it, and the AI picks which tools to use.

What MCP is not: an API key or a plugin store

It's not an AI model. MCP doesn't make the AI smarter.
It's not a data source. MCP is the connection, not what's on the other end.
It's not an API key you paste into a chat. Good MCP servers use a proper sign-in, usually OAuth ("Sign in with..."). The AI never sees your password.
It's not a plugin store. Directories of MCP servers exist, but MCP itself is only the standard. Anyone can build a server.
It's not the same as an API. An API is how programs talk to a service. MCP sits on top, so an AI can use it; see MCP vs API.

A real example: one question, several tool calls

Here's the pre-foreclosure question from above, run through Claude in a Goliath test account. Goliath's MCP server has four tools.

search_operations : the AI searches Goliath's operations for one that finds properties by signal.
describe_operation : it reads what that operation needs (county, signal type, date range).
run_read_operation with filterProperties: it runs the search for Shelby County pre-foreclosures filed in the last 30 days.
run_read_operation with getPropertySignals: it pulls the filing details, so it can show dates and case types.

You asked one question; the AI made four calls. It worked out the steps itself.
Every call was a "read". Nothing changed in the account.
It used your permissions. It saw only what your Goliath login can see.

Who makes MCP servers?

Three kinds of makers, and the difference matters for trust:

The company that owns the software or data (an official server, such as Zillow's or ATTOM's).
A third party that hosts a server for someone else's product.
Independent developers who publish free community code.

Is MCP safe?

MCP is only a standard. Safety depends on the server and your setup.

How you sign in. A browser sign-in (OAuth) beats pasting an API key into a config file.
What it's allowed to do. The best servers split "look things up only" from "make changes".
What's switched off. Risky actions (sending texts, spending money) stay off until someone turns them on.
Whose permissions it uses. It should act as you, never with more access than your own login.
Who built it. An official server from a company you already trust is the safe default.

For prompt injection and other risks, see MCP security.

Where real estate fits

Real estate runs on scattered data and lots of follow-up. Listings, county records, owner phones, CRM conversations and deal spreadsheets all live in different places.

Questions

Do I need to code to use MCP? No, you add a connector in settings, paste the server address (or pick it from the directory) and sign in.

Which AI apps support MCP? Claude (web, desktop and Claude Code), ChatGPT, Cursor and a growing list of others, with plans that differ.

Is MCP free? The standard is free, while servers range from free open-source to per-call or subscription data and plan-included software.

See an MCP do real work. Book a 20-minute Goliath demo to watch an AI find properties, look up owners and build a call list.