Model Context Protocol (MCP) is a way to expose tools and resources to agents and editors through a documented contract — think "USB for model integrations" — so clients can connect to many servers without bespoke plugins per vendor.
What MCP aims to solve
- Reuse — write a filesystem or Git integration once; many hosts consume it.
- Clear boundaries — separate process, permissions, and transport concerns from the model.
- Interoperability — swap hosting environments with less glue code.
Security mindset
Any protocol that grants tools is a privilege boundary. Run MCP servers with least privilege, audit what each server can read or change, and keep secrets out of prompts.
Treat third-party MCP servers like installing npm packages with file and network access — review before trusting in production.
Do you need MCP day one?
If you own both the product and integrations, plain REST routes + your tool definitions may suffice. MCP shines when you want ecosystem compatibility (multiple clients, shared servers, rapid swapping of backends).
Key takeaways
- MCP standardizes how capabilities are advertised and invoked — not a replacement for authz design.
- Operational security matters more than the wire format.
- Adopt when interoperability savings outweigh operating another moving part.