Rohan Mehta ab6095dde0 Allow callers to control prompt cache keys independently of session IDs (#55587) ...

## What changed

Expose `PromptCacheKey` through `StartThreadOptions` with three policies: retain the default session-derived key, send a custom key, or omit `prompt_cache_key` from model requests. Keep session identity headers independent of this policy.

Propagate the policy to child agents, delegated sessions, and guardian review sessions. Hosts must reapply the policy when resuming a thread from storage.

## Testing

Add coverage for all three policies across turns, including unchanged session and thread headers. Extend subagent coverage to verify inheritance of the default and omitted-key policies.

GitOrigin-RevId: f9e8ab31fcf568636f9712726760e4e9a4672428

2026-10-20 14:14:59 +00:00

..

src

Allow callers to control prompt cache keys independently of session IDs (#55587)

2026-10-20 14:14:59 +00:00

BUILD.bazel

Add codex-core public API listing (#20243)

2026-04-29 22:58:08 +00:00

Cargo.toml

Extract persisted history types into a dedicated crate (#37871)

2026-08-10 19:26:52 +00:00