Skip the protocol theory. Build a working Model Context Protocol server in TypeScript, wire it into Claude Code, and make a real agent call a real tool in under an hour. Code, traps, and how to know it works.
Prompt engineering was about wording one message. Context engineering is about managing the entire context window as a scarce budget — what goes in, in what order, and what gets evicted. For a backend engineer, it's working-set management applied to an LLM.
If a junior can ship a feature in a day with Claude Code, what's the senior engineer actually for? The skills that get you promoted in 2026 — and the ones that quietly stopped counting.
Anyone with Cursor and an afternoon can ship a prototype. The gap between that and a production system isn't speed — it's the judgment to know what's actually right. The case for taste as the 2026 differentiator.
Model Context Protocol turns your internal services into something an agent can call without bespoke glue. What MCP actually is, what it costs to expose one well, and the patterns that hold up when the caller is an LLM instead of a UI.
Claude Code, Cursor, Antigravity — the tools are real, the productivity claims are mostly real, and the new skill is shaping work for an agent rather than doing it. A senior engineer's field notes on what changed and what didn't.