MCP is an open standard for connecting coding agents to external context and actions. A small server exposes tools or data - your database schema, an API spec, a component library - and any MCP-compatible agent can use it. It is the difference between an agent that guesses your internal API and one that reads it.
What you get
- A spec, not a product. Client-server protocol with SDKs in the major languages; agents (Claude Code, Cursor and others) connect to any compliant server.
- A server directory. Maintained servers for popular sources already exist - docs platforms, databases, design tools, browsers - so you often configure instead of build.
- Granular permissions. Expose read-only tools, scoped queries or specific actions; access is something you design, not something you hope for.
How to use it
- Identify the source of truth your agent keeps guessing wrong (niche library docs, DB schema, design tokens).
- Find the maintained server for it in the directory; install and configure with read-only, scoped credentials.
- Run one real task and compare with the guessing baseline. No visible win? Drop it.
- Add servers one at a time. Each should retire a mistake you keep correcting by hand.
Good to know
Start read-only and expand deliberately: write-capable servers belong behind human review. MCP earns its setup cost where truth is live and structured - for a static style guide, two lines in AGENTS.md still beat a server.