fix(acp): persist runtime model and mode into assistant preferences#482
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When users switched the model or mode inside an ACP conversation, the change reached the running agent through `set_config_option` but never flowed back into `assistant_preferences.last_*`. The next conversation seeded from the same assistant in `auto` mode therefore re-used the previously persisted value, ignoring the user's most recent pick. Mirror runtime model/mode switches into the persisted assistant snapshot and preference, but only when the agent confirms the change as observed — `command_ack` means the request was accepted, not applied, and unrelated option ids (e.g. `thought_level`) have no preference mapping. Persistence failures are logged and do not roll back the user-facing config switch.
piorpua
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Jun 17, 2026
🤖 I have created a release *beep* *boop* --- ## [0.1.31](v0.1.30...v0.1.31) (2026-06-17) ### Features * **assistant:** add built-in AionUi self-management assistant ([#474](#474)) ([eea941e](eea941e)) * **assistant:** expand AionUi assistant into a butler with remote-access ([#481](#481)) ([794c21a](794c21a)) * enforce TeamRun ownership for agent turns ([#483](#483)) ([4cc168a](4cc168a)) * **team:** support queued team_send_message semantics ([#479](#479)) ([a57a079](a57a079)) ### Bug Fixes * **acp:** persist runtime model and mode into assistant preferences ([#482](#482)) ([b9bcad9](b9bcad9)) * harden ACP image path handling ([#477](#477)) ([c79b5a8](c79b5a8)) * **team:** retry handoff turns after runtime release ([#480](#480)) ([77d252f](77d252f)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
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Summary
set_config_optioninto the persisted assistant snapshot andassistant_preferencesso an assistant configured withdefault_*_mode = autoactually remembers the user's most recent pick across conversations.Observed—CommandAckonly acknowledges the request, and unrelated option ids (e.g.thought_level) have no preference mapping.warn!but do not roll back the user-facing config switch.Why
Before this change, switching the model inside an ACP conversation reached the running agent through
acpConversation.setConfigOption, but that code path forwarded straight toIAgentTask::set_config_optionand never touchedassistant_preferences.last_*. The next conversation seeded from the same assistant inautomode therefore re-used the previously persisted value, ignoring the user's most recent pick. The aionrs path already wrote back viaConversationService::update; this brings the ACP path to parity.Verification
cargo test -p aionui-conversation(270 lib + integration tests pass, including 3 newset_config_option_*cases)cargo clippy -p aionui-conversation --tests --no-deps -- -D warningscargo fmt -p aionui-conversation --check