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Preserve parent cache affinity for ephemeral forks - #44862
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## Why ChatGPT derives Responses cache affinity from the `session-id` header. Ephemeral forks need to reuse their parent's cache routing while retaining their own session and thread identities. ## What changed - Inherit the parent session ID as the `prompt_cache_key` for ephemeral root forks. - Use the prompt cache key for root-agent Responses `session-id` headers, including WebSocket handshakes. Preserve the actual session identity in turn metadata and leave non-root-agent routing unchanged. - Keep enabled goal tool definitions visible on ephemeral threads, but reject execution with `Goal tools require a persistent thread.` and disable automatic goal continuation without persistent state. ## Testing Add regression coverage for inherited cache routing with distinct fork identities, matching parent and fork tool definitions, WebSocket session headers, and rejection of ephemeral goal tool execution. GitOrigin-RevId: d235e97630068b27f7ebd562dd23ac6266ebc1b9
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Preserve parent cache affinity for ephemeral forks
Why
ChatGPT derives Responses cache affinity from the
session-idheader. Ephemeral forks need to reuse their parent's cache routing while retaining their own session and thread identities.What changed
prompt_cache_keyfor ephemeral root forks.session-idheaders, including WebSocket handshakes. Preserve the actual session identity in turn metadata and leave non-root-agent routing unchanged.Goal tools require a persistent thread.and disable automatic goal continuation without persistent state.Testing
Add regression coverage for inherited cache routing with distinct fork identities, matching parent and fork tool definitions, WebSocket session headers, and rejection of ephemeral goal tool execution.