MCP vs REST APIs for agents
REST still powers the web. Agents move faster when tools arrive as a protocol catalog they can list and call.
REST APIs are excellent for product backends. Agents, though, need discovery, typed tool schemas, and a shared call loop. MCP is built for that loop.
Where REST still wins
Public product APIs, webhooks, and human dashboards. Keep REST there.
Where MCP wins for agents
Dynamic tool lists, one client library, and consistent auth across tools. The agent spends less time on glue and more time on the job.