claude.dev Blog / technical writing for people building with Claude
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claude.dev
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Why it matters
Anthropic's developers now publish Claude Code guides, evalA repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.Full definition →-design playbooks, context engineeringDeciding what an agent sees at each step — the discipline that replaced prompt engineering once context windows got large enough to fill badly.Full definition → advice for Claude 5 models and task cost breakdowns in one place. It is a first-party source for how to build with Claude.
Terms in this piece · Glossary
eval — A repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.
context engineering — Deciding what an agent sees at each step — the discipline that replaced prompt engineering once context windows got large enough to fill badly.
