CCDV-F: Claude Certified Developer — Foundations

By Anthropic · Question Mode

QuestionQ79

VerifiedPrompt and Context Engineering

Your application uses the Messages API to manage multi-turn conversations. Each new turn resends the full conversation history, and your token costs increase as conversations grow longer. You suspect there is a more efficient way to do this.

How would you address it?

Explanation

Prompt caching reuses unchanged prefixes, including earlier conversation history, at a lower cache-read rate while preserving the full context. Automatic caching can move the cache breakpoint forward as the conversation grows. Savings depend on factors such as cache lifetime and minimum cacheable length. (platform.claude.com)

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