Propagate context window options from Copilot models to the picker#320905
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Pull request overview
Propagates Copilot model “long context” tier metadata through the agent host model configuration schema so the chat model picker can surface a Context Size selector when using agent host sessions.
Changes:
- Add
contextTiermodel configuration schema generation for agent-host Copilot models based on runtime billingtokenPrices. - Wire
contextTierthrough session launch and model switching (setModel) so the selected tier is applied. - Move
formatTokenCountintovs/base/common/numbersand relocate its unit tests accordingly.
Show a summary per file
| File | Description |
|---|---|
| src/vs/workbench/contrib/chat/test/browser/widget/input/chatModelPicker.test.ts | Removes formatTokenCount coverage from picker tests after extracting utility. |
| src/vs/workbench/contrib/chat/browser/widget/input/chatModelPicker.ts | Imports shared formatTokenCount from base numbers utility. |
| src/vs/workbench/contrib/chat/browser/chatManagement/chatModelsWidget.ts | Switches formatTokenCount import to the shared base utility. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostLanguageModelProvider.ts | Groups contextTier under the picker’s tokens config group for UI surfacing. |
| src/vs/platform/agentHost/test/node/copilotAgent.test.ts | Adds coverage for emitted config schema (thinking level vs. context tier behavior). |
| src/vs/platform/agentHost/node/copilot/copilotSessionLauncher.ts | Adds contextTier config key and passes it into session creation config. |
| src/vs/platform/agentHost/node/copilot/copilotAgentSession.ts | Extends setModel to forward contextTier into the SDK session model switch call. |
| src/vs/platform/agentHost/node/copilot/copilotAgent.ts | Builds combined model config schema including contextTier based on billing token tiers; applies it on model changes. |
| src/vs/base/test/common/numbers.test.ts | Adds formatTokenCount unit tests in the base numbers test suite. |
| src/vs/base/common/numbers.ts | Introduces shared formatTokenCount utility for compact token-count display. |
Copilot's findings
- Files reviewed: 10/10 changed files
- Comments generated: 1
DonJayamanne
approved these changes
Jun 11, 2026
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Fixes #320824