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Rename Ensemble to Fusion across the codebase - #341932
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SteVen Batten (sbatten) merged 4 commits intoOct 16, 2026
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🟡 Changes recommended
Persisted configuration, mixed-version metadata compatibility, and resumed-session tier reporting regressions remain unresolved.
3 open findings
What changed in this PR
Renames Ensemble to Fusion across Agent Host and chat model selection, while retaining rollout setting IDs.
Changes:
- Updates model labels, metadata, configuration identifiers, and accessibility text.
- Renames displayed tiers to Lite, Balance, and Max.
- Aligns per-chat configuration with Fusion presentation and updates tests.
| File | Description |
|---|---|
| src/vs/workbench/contrib/chat/test/browser/widget/input/modelPicker/modelPickerTelemetry.test.ts | Updates routing and telemetry expectations. |
| src/vs/workbench/contrib/chat/test/browser/widget/input/modelPicker/modelPickerTabbedWidget.test.ts | Updates tier-selection expectations. |
| src/vs/workbench/contrib/chat/test/browser/widget/input/modelPicker/modelPickerHover.test.ts | Updates Fusion hover fixtures. |
| src/vs/workbench/contrib/chat/test/browser/widget/input/chatInputModelSelectionController.test.ts | Renames selection fixtures and comments. |
| src/vs/workbench/contrib/chat/test/browser/agentSessions/agentHostLanguageModelProvider.test.ts | Updates metadata expectations. |
| src/vs/workbench/contrib/chat/test/browser/agentSessions/agentHostCopilotCliSettingsContribution.test.ts | Updates settings-forwarding tests. |
| src/vs/workbench/contrib/chat/test/browser/agentSessions/agentHostChatContribution.test.ts | Updates response-footer expectations. |
| src/vs/workbench/contrib/chat/test/browser/accessibility/chatAccessibilityHelp.test.ts | Updates accessibility text expectations. |
| src/vs/workbench/contrib/chat/common/languageModels.ts | Renames metadata and descriptions. |
| src/vs/workbench/contrib/chat/browser/widget/input/modelPicker/modelPickerWidget.ts | Renames routing helpers and metadata accesses. |
| src/vs/workbench/contrib/chat/browser/widget/input/modelPicker/modelPickerTabbedWidget.ts | Updates Fusion grouping and descriptions. |
| src/vs/workbench/contrib/chat/browser/widget/input/modelPicker/modelPickerPresentation.ts | Updates tier-label resolution. |
| src/vs/workbench/contrib/chat/browser/widget/input/modelPicker/modelPickerHover.ts | Uses renamed metadata. |
| src/vs/workbench/contrib/chat/browser/widget/input/modelPicker/modelPickerCard.ts | Updates Fusion description handling. |
| src/vs/workbench/contrib/chat/browser/widget/input/chatInputModelSelectionController.ts | Updates a presentation comment only. |
| src/vs/workbench/contrib/chat/browser/chat.shared.contribution.ts | Updates setting descriptions and identifiers. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostSessionHandler.ts | Updates response-footer naming. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostLanguageModelProvider.ts | Consumes Fusion metadata. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostCopilotCliSettingsContribution.ts | Updates forwarded configuration references. |
| src/vs/workbench/contrib/chat/browser/actions/chatAccessibilityHelp.ts | Describes Fusion tiers. |
| src/vs/sessions/contrib/chat/test/browser/sessionModelSelection.test.ts | Updates a test comment only. |
| src/vs/platform/agentHost/test/node/providerIntegration/copilotAutoTier.integrationTest.ts | Renames a policy preflight key. |
| src/vs/platform/agentHost/test/node/e2e/README.md | Updates policy-testing terminology. |
| src/vs/platform/agentHost/test/node/copilotSessionLauncher.test.ts | Updates configuration fixtures. |
| src/vs/platform/agentHost/test/node/copilotAgentSession.test.ts | Updates experimental-mode test naming. |
| src/vs/platform/agentHost/test/node/copilotAgent.test.ts | Updates catalog tests and adds configuration coverage. |
| src/vs/platform/agentHost/node/copilot/copilotSessionLauncher.ts | Renames tier and feature-gate helpers. |
| src/vs/platform/agentHost/node/copilot/copilotAgentSession.ts | Uses renamed configuration member. |
| src/vs/platform/agentHost/node/copilot/copilotAgent.ts | Updates presentation and per-chat model schemas. |
| src/vs/platform/agentHost/common/meta/vscode/agentModelFusionMeta.ts | Adds Fusion metadata reader and writer. |
| src/vs/platform/agentHost/common/meta/vscode/agentModelEnsembleMeta.ts | Removes previous metadata implementation. |
| src/vs/platform/agentHost/common/meta/agentModelMeta.ts | Exports renamed metadata helpers. |
| src/vs/platform/agentHost/common/copilotCliConfig.ts | Renames root keys; preserves rollout setting IDs. |
| src/vs/platform/agentHost/common/autoModeTiers.ts | Defines Lite and Balance display labels. |
🧠 Review effort: Balanced
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Bhavya U (bhavyaus)
previously approved these changes
Oct 16, 2026
SteVen Batten (sbatten)
marked this pull request as ready for review
October 16, 2026 03:20
SteVen Batten (sbatten)
enabled auto-merge (squash)
October 16, 2026 03:21
# Conflicts: # src/vs/platform/agentHost/node/copilot/copilotAgent.ts
Dmitriy Vasyura (dmitrivMS)
previously approved these changes
Oct 16, 2026
# Conflicts: # src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostSessionHandler.ts # src/vs/workbench/contrib/chat/browser/chat.shared.contribution.ts
Justin Chen (justschen)
approved these changes
Oct 16, 2026
Karthik Nadig (karthiknadig)
approved these changes
Oct 16, 2026
Contributor
Screenshot ChangesBase: Changed (1)
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SteVen Batten (sbatten)
deleted the
agents/rename-ensemble-to-fusion-strings
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October 16, 2026 05:24
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This pull request implements a comprehensive rename of "Ensemble" to "Fusion" throughout the codebase, while preserving specific setting IDs related to the current rollout. The changes include:
Note: The setting IDs related to the rollout remain unchanged to avoid impacting current functionality. The type check and linting pass without errors, and existing tests show no new failures related to these changes.