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Agent Skills vs MCP vs Function Calling vs A2A: When to Use Each

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

📖 TL;DR Agent Skills teach an agent how to do something. A folder with a SKILL.md file. No server, no auth, no runtime. MCP gives an agent access to something. A live JSON-RPC server exposing tools, resources and prompts. Function calling is the model-level primitive underneath both. Provider-spec…

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  1. 2026-09-02 11:47 · DEV Community — AI
    Agent Skills vs MCP vs Function Calling vs A2A: When to Use Each

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