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## Why `ModelClientSession` and `compact_conversation_history()` were still rebuilding the same `ResponsesApiRequest` fields separately. That duplication makes it easy for normal `/responses` turns and compact requests to drift when request-shape changes land later, which is exactly the kind of cache-affecting divergence we want to avoid. This follow-up keeps the scope small by extracting the shared request-construction logic into one helper and using it from both paths. ## What changed - move `ResponsesApiRequest` construction into a shared `ModelClient::build_responses_request(...)` helper in `core/src/client.rs` - update the normal `/responses` streaming path to call that helper instead of the old `ModelClientSession`-local implementation - update `compact_conversation_history()` to derive its compact payload from the same helper so `model`, `instructions`, `input`, `tools`, `parallel_tool_calls`, `reasoning`, and `text` stay aligned with normal request building - add a unit test covering the shared helper's prompt cache key, installation metadata, and `service_tier` behavior ## Verification - `cargo test -p codex-core build_responses_request_sets_shared_cache_and_metadata_fields` - `cargo test -p codex-core --test all remote_compact_v2_reuses_context_compaction_for_followups` ## Docs No docs update needed.