Ask HN: Why does MCP need to exist?
Why can't we just use REST APIs with OpenAPI specs provided to the LLM (possibly alongside x-llm-* hints to give additional contextual information)? Arguments I've seen focus on advantages of MCP for stateful or bidirectional connections, but it's not obvious that additional complexity is worth the tradeoff to me. Help me understand why this exists 1 comments on Hacker News.
Why can't we just use REST APIs with OpenAPI specs provided to the LLM (possibly alongside x-llm-* hints to give additional contextual information)? Arguments I've seen focus on advantages of MCP for stateful or bidirectional connections, but it's not obvious that additional complexity is worth the tradeoff to me. Help me understand why this exists
Why can't we just use REST APIs with OpenAPI specs provided to the LLM (possibly alongside x-llm-* hints to give additional contextual information)? Arguments I've seen focus on advantages of MCP for stateful or bidirectional connections, but it's not obvious that additional complexity is worth the tradeoff to me. Help me understand why this exists 1 comments on Hacker News.
Why can't we just use REST APIs with OpenAPI specs provided to the LLM (possibly alongside x-llm-* hints to give additional contextual information)? Arguments I've seen focus on advantages of MCP for stateful or bidirectional connections, but it's not obvious that additional complexity is worth the tradeoff to me. Help me understand why this exists
Hacker News story: Ask HN: Why does MCP need to exist?
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Reviewed by Tha Kur
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May 27, 2025
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