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* fix: cap prompt caching breakpoints at 4 to prevent API 400 errors (fixes #2448) The previous _apply_prompt_caching() attached cache_control to every text block in the system prompt, every content block in the last N messages, and the last tool definition. In multi-turn conversations with structured content blocks this easily exceeded the 4-breakpoint hard limit enforced by both the Anthropic API and AWS Bedrock, producing a 400 Bad Request (or a silent "No generations found in stream" when streaming). Fix: collect all candidate blocks in document order, then apply cache_control only to the last MAX_CACHE_BREAKPOINTS (4) of them. Later breakpoints cover a larger prefix and therefore yield better cache hit rates, making this the optimal placement strategy as well as the safe one. Adds 13 unit tests covering the budget cap, edge cases, and correct last-candidate placement. * docs: clarify _apply_prompt_caching docstring includes tool definitions Per Copilot review: the implementation also caches the last tool definition (see the candidates list at lines 202-205), so the docstring summary should explicitly mention tools alongside system and recent messages. * Fix the lint error * style: fix ruff format check for test_claude_provider_prompt_caching.py Add the missing blank line before the 'Edge cases' section comment so that ruff format --check passes in CI. --------- Co-authored-by: octo-patch <octo-patch@github.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>