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[codex] Send realtime transcript deltas on handoff (#18761)

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## Summary
- Track how many realtime transcript entries have already been attached
to a background-agent handoff.
- Attach only entries added since the previous handoff as
`<transcript_delta>` instead of resending the accumulated transcript
snapshot.
- Update the realtime integration test so the second delegation carries
only the second transcript delta.

## Validation
- `just fmt`
- `cargo test -p codex-api`
- `cargo test -p codex-core
inbound_handoff_request_sends_transcript_delta_after_each_handoff`
- `cargo build -p codex-cli -p codex-app-server`

## Manual testing
Built local debug binaries at:
- `codex-rs/target/debug/codex`
- `codex-rs/target/debug/codex-app-server`
This commit is contained in:
guinness-oai
2026-04-20 16:46:15 -07:00
committed by GitHub
parent 216e7a0a56
commit ca3246f77a
2 changed files with 8 additions and 4 deletions
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6
codex-rs/core/tests/suite/realtime_conversation.rs
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@@ -2661,7 +2661,7 @@ async fn inbound_handoff_request_uses_active_transcript() -> Result<()> {
}
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn inbound_handoff_request_keeps_transcript_history_after_each_handoff() -> Result<()> {
async fn inbound_handoff_request_sends_transcript_delta_after_each_handoff() -> Result<()> {
skip_if_no_network!(Ok(()));
let api_server = start_mock_server().await;
@@ -2773,9 +2773,9 @@ async fn inbound_handoff_request_keeps_transcript_history_after_each_handoff() -
let second_user_texts = requests[1].message_input_texts("user");
assert!(second_user_texts.iter().any(|text| text
== "<realtime_delegation>\n <input>second question</input>\n <transcript_delta>user: first question\nuser: second question</transcript_delta>\n</realtime_delegation>"));
== "<realtime_delegation>\n <input>second question</input>\n <transcript_delta>user: second question</transcript_delta>\n</realtime_delegation>"));
assert!(!second_user_texts.iter().any(|text| text
== "<realtime_delegation>\n <input>second question</input>\n <transcript_delta>user: first questionsecond question</transcript_delta>\n</realtime_delegation>"));
== "<realtime_delegation>\n <input>second question</input>\n <transcript_delta>user: first question\nuser: second question</transcript_delta>\n</realtime_delegation>"));
realtime_server.shutdown().await;
Ok(())