Charlie Marsh 3ead673946 Defer extension tool history materialization until first access (#47035) ...

## Why

Extension tool calls eagerly copied and converted conversation history even when the tool never read it.

## What changed

Retain a shared invocation-time snapshot and defer conversion to raw response items until `ConversationHistory::items()` is called. Cache the result across clones with `LazyLock`, and keep debug formatting from triggering materialization. Release unrelated history metadata when capturing the shared items.

## Testing

Extend the extension executor test to verify that history first read after a later turn still reflects the invocation-time snapshot, in both legacy and paginated history modes. Update the history API test to check that shared items preserve their envelopes.

GitOrigin-RevId: c737b765b7e4889735dc78e12d685d36e854570b

2026-09-21 13:56:17 +00:00

..

common

Wire agent message boards into persistent multi-agent runtimes (#47017)

2026-09-21 12:35:36 +00:00

remote_env_windows

Apply remote platform semantics to exec safety checks (#42113)

2026-09-01 18:24:56 +00:00

suite

Defer extension tool history materialization until first access (#47035)

2026-09-21 13:56:17 +00:00

all.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

responses_headers.rs

Support explicit provider model catalog URLs (#46561)

2026-09-19 01:36:53 +00:00