Preserve configured-default intent through dialog agent changes

src/main/persistence/loading-store/normalize-loaded-global-settings.ts

@@ -134,7 +134,6 @@ export function normalizeLoadedGlobalSettings(
     // Why: rollback builds still read commitMessageAi, so refresh the legacy projection from sourceControlAi for compat.
     commitMessageAi: projectSourceControlAiToLegacyCommitMessageAi(
       migratedSourceControlAi,
-      piConfiguredDefaultModelState,
       parsed.settings?.commitMessageAi ?? defaults.settings.commitMessageAi
     ),
     voice: {

src/renderer/src/components/right-sidebar/SourceControlTextGenerationDialog.test.ts

@@ -212,6 +212,17 @@ describe('buildCommitMessageGenerationParams', () => {
     })
   })
 
+  it('encodes configured default when switching the dialog to Pi', () => {
+    expect(
+      buildCommitMessageGenerationParams({
+        agentId: 'pi',
+        commandTemplate: '{basePrompt}',
+        baseParams: null,
+        settings: null
+      })
+    ).toMatchObject({ model: 'github-copilot/gpt-5.4-mini', useConfiguredDefaultModel: true })
+  })
+
   it('preserves Pi configured-default intent through dialog reconstruction', () => {
     expect(
       buildCommitMessageGenerationParams({

src/renderer/src/components/right-sidebar/source-control/ai/text-generation-params.ts

@@ -1,5 +1,7 @@
 import {
   CUSTOM_AGENT_ID,
+  PI_DEFAULT_MODEL_ID,
+  PI_RETIRED_COPILOT_DEFAULT_MODEL_ID,
   getCommitMessageAgentCapability,
   isCustomAgentId
 } from '../../../../../../shared/commit-message-agent-spec'
@@ -41,6 +43,10 @@ export function buildCommitMessageGenerationParams(args: {
       ? args.baseParams.model
       : (capability.models.find((model) => model.id === capability.defaultModelId)?.id ??
         capability.defaultModelId)
+  const useConfiguredDefaultModel =
+    args.agentId === 'pi' &&
+    (modelId === PI_DEFAULT_MODEL_ID ||
+      (sameResolvedAgent && args.baseParams?.useConfiguredDefaultModel === true))
   const model = capability.models.find((candidate) => candidate.id === modelId)
   const thinkingLevel =
     sameResolvedAgent && args.baseParams?.thinkingLevel
@@ -50,10 +56,8 @@ export function buildCommitMessageGenerationParams(args: {
   const customAgentCommand = args.baseParams?.customAgentCommand ?? args.customAgentCommand
   return {
     agentId: args.agentId,
-    model: modelId,
-    ...(sameResolvedAgent && args.baseParams?.useConfiguredDefaultModel
-      ? { useConfiguredDefaultModel: true }
-      : {}),
+    model: useConfiguredDefaultModel ? PI_RETIRED_COPILOT_DEFAULT_MODEL_ID : modelId,
+    ...(useConfiguredDefaultModel ? { useConfiguredDefaultModel: true } : {}),
     ...(thinkingLevel ? { thinkingLevel } : {}),
     commandInputTemplate: args.commandTemplate,
     ...(args.agentArgs !== undefined ? { agentArgs: args.agentArgs } : {}),

src/shared/source-control-ai.ts

@@ -220,7 +220,7 @@ export function resolveSourceControlAiForOperation(
   const model =
     spec.models.find((candidate) => candidate.id === persistedModelId) ??
     discoveredModels.find((candidate) => candidate.id === persistedModelId) ??
-    (spec.modelSource === 'dynamic' && persistedModelId
+    (spec.id === 'pi' && persistedModelId
       ? { id: persistedModelId, label: persistedModelId }
       : undefined) ??
     getCommitMessageModel(resolvedAgent, spec.defaultModelId)