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feat(desktop): gate ACP tool summaries behind a preview experiment

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Two-layer prod-safe gate for the acpToolSummaries experiment, default OFF:

UI gate: buildCompactToolSummary now takes summaryTitleEnabled (default
off) and only consults the agent-provided friendly phrase when the
experiment is on. ToolItem and BotActivityBar/getActivityHeadline read
useFeatureEnabled('acpToolSummaries') and thread the flag through.
Failure-precedence behavior is unchanged: failed rows always paint the
failure label regardless of the gate.

Runtime/cost gate: the frontend mirrors preview-experiment overrides to
experiments.json via the new set_desktop_experiments command (AppShell
mirrors on boot and on every toggle); spawn_agent_child sets
BUZZ_AGENT_NO_TOOL_SUMMARY=1 when the experiment is off so disabled
agents never spend the async LLM summary call. All spawn paths (start,
create, app-startup restore) funnel through spawn_agent_child, and
missing/unknown mirror state resolves to off — restore-time respawns
before the webview loads stay on the safe side. Experiment-on leaves
the env untouched, so a user-provided kill switch still wins.

Co-authored-by: Taylor Ho <taylorkmho@gmail.com>
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>
This commit is contained in:
npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w
2026-07-07 00:28:45 -07:00
parent 8720b5d1ef
commit d4b625037e
19 changed files with 392 additions and 14 deletions
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9
desktop/scripts/check-file-sizes.mjs
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@@ -99,7 +99,10 @@ const overrides = new Map([
// +1 for agent_pubkey field in setup payload (config-nudge card wire).
// persona-blank-fallback: resolve_effective_prompt_model_provider gains a
// record_provider param + applies persona_field_with_record_fallback. +5 lines.
["src-tauri/src/managed_agents/runtime.rs", 2213],
// acp-tool-summaries experiment gate: apply_tool_summary_gate helper +
// spawn-time kill-switch wiring (~23 lines incl. off/on env tests context).
// Load-bearing prod-safety gate, queued to split.
["src-tauri/src/managed_agents/runtime.rs", 2236],
// config-bridge setup-payload env-boundary fix adds readiness wiring in
// spawn_agent_child; load-bearing security fix, queued to split.
["src-tauri/src/managed_agents/config_bridge/reader.rs", 1016],
@@ -127,7 +130,9 @@ const overrides = new Map([
// baked-env-required-badge: getBakedBuildEnvKeys wrapper adds ~16 lines. Queued to split.
// restart-badge: started the queued split — start/stopManagedAgent moved to
// tauriManagedAgents.ts; limit ratcheted down 1388 → 1380 to bank the headroom.
["src/shared/api/tauri.ts", 1380],
// acp-tool-summaries: setDesktopExperiments binding (+11 lines) mirrors
// preview-experiment overrides to Rust for spawn-time gating.
["src/shared/api/tauri.ts", 1391],
// readiness-gate: PersonaDialog.tsx threads computeLocalModeGate +
// requiredCredentialEnvKeys + RequiredFieldLabel so the "New agent" dialog
// shows required markers and credential amber rows (parity with