Not all agents have access to a sandbox/cli/code execution environment to run arbitrary api calls etc. MCP helps by essentially having another tool call without needing a sandbox. If you do have a sandbox, then might as well do codemode if you insist on mcp https://blog.cloudflare.com/code-mode/
Devil's advocate will say "Well, the agent would need an MCP client to use MCP-served resources... if you can give it that, why not give it an HTTP client?"
