MCP (Model Context Protocol)

MCP stands for Model Context Protocol. It is an open standard, created by Anthropic, that defines how AI models connect to external tools, data sources, and services. Think of it as a universal plug format. Instead of building a custom one-off integration every time you want Claude Code to touch a new service, you build or install an MCP server and the model knows how to talk to it.

Before MCP, connecting an AI to your calendar, your database, your email, or a third-party API required custom glue code for every single connection. MCP standardizes that handshake. The model learns the protocol once, and any service that speaks MCP becomes immediately available.

How MCP works in practice

An MCP server is a small program that exposes a set of tools and resources to the model. When Claude Code is running and an MCP server is connected, the model can call those tools just like it would call any other function. It can read from a database, write to a file, send a message, query an API, or pull context from a live system.

• You can connect Claude Code to a client's CRM so it builds and tests against their real data.
• You can wire up your own inbox, calendar, and task list so your AI assistant can take action, not just give advice.
• You can build reusable MCP servers for common integrations and offer them as part of your service.
• You can chain multiple MCP connections so one session touches several systems in sequence.

Why MCP matters when you are selling

When you show a prospect a demo, the single fastest way to make it feel real is to run it against their actual context. A tool that reads their real data, in their real format, and produces a real output is worth ten times more in a sales conversation than a polished prototype with fake data. MCP is what makes that possible.

It also changes what you can sell. Because MCP makes integrations composable and reusable, you can build an integration once and deploy it across multiple clients in the same industry. That is one of the cleaner paths to a productized service with real recurring value.

The builder opportunity around MCP

Most businesses do not have anyone who can build MCP servers for them. If you can identify a vertical where companies all use the same stack (a specific CRM, a specific accounting tool, a specific platform) and you build the MCP connector that bridges Claude Code to that stack, you have a distribution advantage. Every client in that vertical needs the same integration.

Common things builders connect via MCP

• Databases (Postgres, Supabase, SQLite) so the model can read and write real records.
• Email and calendar services so an agent can schedule, draft, and send.
• Web scraping and search tools so the model can pull live information.
• Internal APIs so a client's existing software becomes part of the agent's toolkit.
• File systems and cloud storage so the model can read documents and write outputs.

MCP versus just writing custom code

You could always write custom code to connect Claude to any service. MCP does not replace that option. What it does is standardize the interface so that tools are composable, shareable, and maintainable. If you build a Notion MCP server for one client, you can reuse it for the next. If the Anthropic ecosystem grows (it is growing fast), more and more pre-built servers will be available, and your job becomes wiring them together instead of building everything from scratch.