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* docs(sdk): recommend 1-hour cache TTL for system prompts (#1980) Add sdk/docs/caching.md with prompt caching best practices for API users building on GSD patterns. Recommends 1-hour TTL for executor, planner, and verifier system prompts which are large and stable across requests within a session. The default 5-minute TTL expires during human review pauses between phases. 1-hour TTL costs 2x on cache miss but pays for itself after 3 hits — GSD phases typically involve dozens of requests per hour. Closes #1980 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * docs(sdk): fix ttl type to string per Anthropic API spec The Anthropic extended caching API requires ttl as a string ('1h'), not an integer (3600). Corrects both code examples in caching.md. Review feedback on #2055 from @trek-e. * docs(sdk): fix second ttl value in direct-api example to string '1h' Follow-up to trek-e's re-review on #2055. The first fix corrected the Agent SDK integration example (line 16) but missed the second code block (line 60) that shows the direct Claude API call. Both now use ttl: '1h' (string) as the Anthropic extended caching API requires — integer forms like ttl: 3600 are silently ignored by the API and the cache never activates. Closes #1980 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>