fix(anthropic): keep mid-conversation system out of the chat completions system prompt - #38053

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oneKn8 wants to merge 8 commits into

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oneKn8:fix-chat-mid-conversation-system-cache

Commits on Sep 14, 2026

feat(anthropic): placement policy for mid-conversation system messages
oneKn8
committed
76629e8
fix(anthropic): keep mid-conversation system out of the chat completions system prompt
oneKn8
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3cbb5bf
refactor(anthropic): single-source the converted system note
oneKn8
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72fb748
test(e2e): prove the prompt cache survives a mid-conversation system reminder on chat completions
oneKn8
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a6ac53b
test(anthropic): cover the cache_control rebuild shapes and type the test helpers
oneKn8
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77ac64d
refactor(anthropic): read the mid-conversation flag through a public supports_ helper
oneKn8
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30d2747
chore(typing): declare the mid-conversation type aliases with TypeAlias
oneKn8
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ebd36a5
fix(anthropic): let add_code_execution_tool take the pass-through message union
oneKn8
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0d76292