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Allow custom Codex instructions for realtime transitions (#36408)

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## What changed

- Add optional `realtimeStartInstructions` and `realtimeEndInstructions` fields to `thread/realtime/start`.
- Apply the instructions when Codex enters and leaves realtime mode, while preserving the existing defaults when either field is omitted.
- Limit each field to 8,192 estimated tokens.

## Testing

- Cover custom entry and exit instructions across realtime state transitions.
- Cover token-limit validation for both fields.

GitOrigin-RevId: b9cfa1ff22e084d8a6b2ed56bd27d95ffdd6b6bd
This commit is contained in:
guinness-oai
2026-07-31 23:51:33 +00:00
committed by copyberry
parent 64b2a3008e
commit 670f69416b
18 changed files with 395 additions and 33 deletions
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codex-rs/protocol/src/protocol.rs
+4
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@@ -220,6 +220,10 @@ pub struct ConversationStartParams {
pub include_startup_context: bool,
/// Complete role-bearing text items to include in the initial realtime session history.
pub initial_items: Vec<ConversationTextParams>,
/// Developer instructions given to Codex when this realtime session starts.
pub realtime_start_instructions: Option<String>,
/// Developer instructions given to Codex when this realtime session ends.
pub realtime_end_instructions: Option<String>,
pub prompt: Option<Option<String>>,
pub realtime_session_id: Option<String>,
pub transport: Option<ConversationStartTransport>,