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Tool Calling and MCP: How Agents Touch the World

This story is from 2026-10-14. It is preserved in the archive; the latest stories are on the live feed.

Throughout the AI System Design series we follow Mailmind, a fictional AI email assistant that reads an inbox, triages messages, and drafts replies. It is our running example. An LLM (large language model) agent sends structured function calls to external services. Those calls are tools. The agent…

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  1. 2026-10-14 13:00 · DEV Community — AI
    Tool Calling and MCP: How Agents Touch the World

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