MCP — the Model Context Protocol — is Anthropic’s open standard for connecting Claude to external tools, data sources, and services. It’s the architecture that lets Claude read from your Google Drive, post to Slack, query a database, or interact with any API without you having to write custom integration code for each one. Here’s what MCP is, how it works, and why it matters.
What MCP Actually Does
Without MCP, connecting Claude to an external system means building a custom bridge: write code that calls the external API, format the results in a way Claude understands, handle authentication, manage errors. Every integration is a separate project.
With MCP, the external system (a database, a SaaS tool, a file system, an API) publishes an MCP server — a standardized interface that describes what it can do. Claude connects to that server and immediately knows what tools are available, what inputs they need, and how to use them. The developer only builds the MCP server once; Claude handles the rest.
What You Can Do With Claude MCP Today
| MCP Integration | What Claude Can Do |
|---|---|
| Google Drive | Search, read, and summarize documents in your Drive |
| Slack | Read channels, search messages, post drafts |
| GitHub | Read repos, create issues, review pull requests |
| Notion | Read and write pages, query databases |
| PostgreSQL / databases | Run queries, read schema, analyze data |
| File systems | Read, write, and organize local files |
| Web search | Search the web and return current results |
| Custom APIs | Any API with an MCP server implementation |
MCP vs. Claude’s Built-In Tools
Claude already has some built-in capabilities — web search, code execution in certain contexts, file analysis. MCP extends this with external integrations that persist across sessions, connect to your actual data, and scale to any service that builds an MCP server.
The practical difference: built-in tools are what Anthropic ships with Claude. MCP tools are what the ecosystem builds — which means the integration surface grows every week as more services add MCP support.
How to Use MCP With Claude
MCP works differently depending on where you’re running Claude:
Claude.ai (web/app): MCP integrations are available through the Connections settings. Anthropic has partnered with services like Google, Notion, Slack, and others whose MCP servers are pre-built and available to connect in a few clicks.
Claude Desktop: The desktop app supports MCP configuration via a JSON config file, letting you connect to any MCP server — including self-hosted ones or custom integrations you build.
Claude Code / API: Developers can wire MCP servers directly into Claude API calls, giving Claude access to any tool during an agentic session.
Why MCP Is a Big Deal
Before MCP, each AI company built its own plugin standard — OpenAI had plugins, others had connectors, and nothing worked across systems. MCP is Anthropic’s bet on an open standard: publish the spec, let anyone build to it, and Claude (and any other AI that implements it) gains access to the entire ecosystem.
The momentum has been significant. Within months of the MCP spec being published, major platforms including Cloudflare, Zapier, HubSpot, and dozens of others shipped MCP server implementations. The network effect is real — the more tools support MCP, the more useful Claude becomes without Anthropic having to build any of those integrations themselves.
For a deeper technical walkthrough, see the Claude MCP Tutorial.
Frequently Asked Questions
What is Claude MCP?
MCP (Model Context Protocol) is an open standard from Anthropic that lets Claude connect to external tools, databases, and services. Instead of one-off integrations, MCP creates a universal protocol — any tool that builds an MCP server can be connected to Claude.
How do I add MCP tools to Claude?
In Claude.ai, go to Settings → Connections to add pre-built MCP integrations for services like Google Drive, Notion, and Slack. In Claude Desktop, you configure MCP servers in a JSON config file. Via the API, you pass MCP server URLs in your request.
Is MCP only for Claude?
No. MCP is an open protocol — any AI model or application can implement it. Anthropic published the spec publicly with the intent of making it an industry standard. Other AI tools have begun adopting it, though Claude has the deepest native MCP integration currently.
What’s the difference between MCP and Claude plugins?
Claude doesn’t use a “plugin” model the way older ChatGPT did. MCP is Anthropic’s approach — an open, standardized protocol rather than a proprietary plugin marketplace. MCP integrations work at a deeper level and are designed to scale across any service that implements the standard.
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