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hardSystem Design

MCP authoring: how do you build a Model Context Protocol server in 2025-26?

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01

Understand the problem

Tools, resources, prompts — transport, discovery, and sandboxing for MCP.

mcptooling
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

03

Study the solution

MCP is JSON-RPC 2.0 over stdio/SSE. Server exposes tools/list, tools/call, resources/*, prompts/*. Client discovers capabilities, calls tools, you sandbox execution.

Solution ready — 2 min read

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04

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