How is using MCP actually different from calling APIs directly?

When you call an API directly, you have to author the tool schemas and the wrapper functions yourself. That means writing the JSON schema for every parameter, implementing the request logic, handling responses, and maintaining all of it as the API evolves. MCP servers provide tool schemas and functions that are already defined for you. So instead of doing that implementation work from scratch, you connect to an existing MCP server and immediately get a curated set of tools your model can use. MCP does not replace APIs, it just standardizes the layer between your application and them.