feat: implement workspace-specific index settings storage

- Add workspace storage methods to ContextProxy
- Update CodeIndexConfigManager to use workspace storage instead of global
- Add migration logic to move existing global settings to workspace
- Update webview message handler to save settings per workspace
- Add comprehensive tests for workspace-specific storage functionality

Fixes #6406

src/core/config/ContextProxy.ts

@@ -128,6 +128,22 @@ export class ContextProxy {
 		return Object.fromEntries(GLOBAL_STATE_KEYS.map((key) => [key, this.getGlobalState(key)]))
 	}
 
+	/**
+	 * ExtensionContext.workspaceState
+	 * https://code.visualstudio.com/api/references/vscode-api#ExtensionContext.workspaceState
+	 */
+
+	getWorkspaceState<T = any>(key: string): T | undefined
+	getWorkspaceState<T = any>(key: string, defaultValue: T): T
+	getWorkspaceState<T = any>(key: string, defaultValue?: T): T | undefined {
+		const value = this.originalContext.workspaceState.get<T>(key)
+		return value !== undefined ? value : defaultValue
+	}
+
+	updateWorkspaceState<T = any>(key: string, value: T) {
+		return this.originalContext.workspaceState.update(key, value)
+	}
+
 	/**
 	 * ExtensionContext.secrets
 	 * https://code.visualstudio.com/api/references/vscode-api#ExtensionContext.secrets

src/core/webview/webviewMessageHandler.ts

@@ -1990,12 +1990,12 @@ export const webviewMessageHandler = async (
 
 			try {
 				// Check if embedder provider has changed
-				const currentConfig = getGlobalState("codebaseIndexConfig") || {}
+				const currentConfig = provider.contextProxy.getWorkspaceState("codebaseIndexConfig") || {}
 				const embedderProviderChanged =
 					currentConfig.codebaseIndexEmbedderProvider !== settings.codebaseIndexEmbedderProvider
 
-				// Save global state settings atomically
-				const globalStateConfig = {
+				// Save workspace state settings atomically
+				const workspaceStateConfig = {
 					...currentConfig,
 					codebaseIndexEnabled: settings.codebaseIndexEnabled,
 					codebaseIndexQdrantUrl: settings.codebaseIndexQdrantUrl,
@@ -2008,8 +2008,8 @@ export const webviewMessageHandler = async (
 					codebaseIndexSearchMinScore: settings.codebaseIndexSearchMinScore,
 				}
 
-				// Save global state first
-				await updateGlobalState("codebaseIndexConfig", globalStateConfig)
+				// Save workspace state first
+				await provider.contextProxy.updateWorkspaceState("codebaseIndexConfig", workspaceStateConfig)
 
 				// Save secrets directly using context proxy
 				if (settings.codeIndexOpenAiKey !== undefined) {
@@ -2041,7 +2041,7 @@ export const webviewMessageHandler = async (
 				await provider.postMessageToWebview({
 					type: "codeIndexSettingsSaved",
 					success: true,
-					settings: globalStateConfig,
+					settings: workspaceStateConfig,
 				})
 
 				// Update webview state

src/services/code-index/__tests__/config-manager.spec.ts

@@ -30,6 +30,8 @@ describe("CodeIndexConfigManager", () => {
 		// Setup mock ContextProxy
 		mockContextProxy = {
 			getGlobalState: vi.fn(),
+			getWorkspaceState: vi.fn(),
+			updateWorkspaceState: vi.fn(),
 			getSecret: vi.fn().mockReturnValue(undefined),
 			refreshSecrets: vi.fn().mockResolvedValue(undefined),
 			updateGlobalState: vi.fn(),
@@ -1811,4 +1813,89 @@ describe("CodeIndexConfigManager", () => {
 			})
 		})
 	})
+
+	describe("workspace-specific storage", () => {
+		it("should use workspace storage instead of global storage", async () => {
+			const mockWorkspaceConfig = {
+				codebaseIndexEnabled: true,
+				codebaseIndexQdrantUrl: "http://workspace-qdrant.local",
+				codebaseIndexEmbedderProvider: "openai",
+				codebaseIndexEmbedderModelId: "text-embedding-3-large",
+			}
+
+			mockContextProxy.getWorkspaceState.mockReturnValue(mockWorkspaceConfig)
+			mockContextProxy.getGlobalState.mockReturnValue(undefined)
+			setupSecretMocks({
+				codeIndexOpenAiKey: "test-openai-key",
+				codeIndexQdrantApiKey: "test-qdrant-key",
+			})
+
+			const result = await configManager.loadConfiguration()
+
+			expect(mockContextProxy.getWorkspaceState).toHaveBeenCalledWith("codebaseIndexConfig")
+			expect(result.currentConfig.qdrantUrl).toBe("http://workspace-qdrant.local")
+			expect(result.currentConfig.modelId).toBe("text-embedding-3-large")
+		})
+
+		it("should migrate global config to workspace storage when workspace config doesn't exist", async () => {
+			const mockGlobalConfig = {
+				codebaseIndexEnabled: true,
+				codebaseIndexQdrantUrl: "http://global-qdrant.local",
+				codebaseIndexEmbedderProvider: "openai",
+				codebaseIndexEmbedderModelId: "text-embedding-3-small",
+			}
+
+			mockContextProxy.getWorkspaceState.mockReturnValue(undefined)
+			mockContextProxy.getGlobalState.mockReturnValue(mockGlobalConfig)
+			setupSecretMocks({
+				codeIndexOpenAiKey: "test-openai-key",
+			})
+
+			const result = await configManager.loadConfiguration()
+
+			// Should have migrated global config to workspace
+			expect(mockContextProxy.updateWorkspaceState).toHaveBeenCalledWith("codebaseIndexConfig", mockGlobalConfig)
+			expect(result.currentConfig.qdrantUrl).toBe("http://global-qdrant.local")
+			expect(result.currentConfig.modelId).toBe("text-embedding-3-small")
+		})
+
+		it("should use default config when neither workspace nor global config exists", async () => {
+			mockContextProxy.getWorkspaceState.mockReturnValue(undefined)
+			mockContextProxy.getGlobalState.mockReturnValue(undefined)
+			mockContextProxy.getSecret.mockReturnValue(undefined)
+
+			const result = await configManager.loadConfiguration()
+
+			expect(result.currentConfig.qdrantUrl).toBe("http://localhost:6333")
+			expect(result.currentConfig.embedderProvider).toBe("openai")
+			expect(result.currentConfig.isConfigured).toBe(false)
+		})
+
+		it("should prefer workspace config over global config when both exist", async () => {
+			const mockWorkspaceConfig = {
+				codebaseIndexEnabled: true,
+				codebaseIndexQdrantUrl: "http://workspace-qdrant.local",
+				codebaseIndexEmbedderProvider: "ollama",
+				codebaseIndexEmbedderBaseUrl: "http://workspace-ollama.local",
+			}
+
+			const mockGlobalConfig = {
+				codebaseIndexEnabled: true,
+				codebaseIndexQdrantUrl: "http://global-qdrant.local",
+				codebaseIndexEmbedderProvider: "openai",
+				codebaseIndexEmbedderModelId: "text-embedding-3-small",
+			}
+
+			mockContextProxy.getWorkspaceState.mockReturnValue(mockWorkspaceConfig)
+			mockContextProxy.getGlobalState.mockReturnValue(mockGlobalConfig)
+
+			const result = await configManager.loadConfiguration()
+
+			// Should use workspace config, not global
+			expect(result.currentConfig.qdrantUrl).toBe("http://workspace-qdrant.local")
+			expect(result.currentConfig.embedderProvider).toBe("ollama")
+			// Should NOT have called updateWorkspaceState since workspace config already exists
+			expect(mockContextProxy.updateWorkspaceState).not.toHaveBeenCalled()
+		})
+	})
 })

src/services/code-index/config-manager.ts

@@ -41,15 +41,28 @@ export class CodeIndexConfigManager {
 	 * This eliminates code duplication between initializeWithCurrentConfig() and loadConfiguration().
 	 */
 	private _loadAndSetConfiguration(): void {
-		// Load configuration from storage
-		const codebaseIndexConfig = this.contextProxy?.getGlobalState("codebaseIndexConfig") ?? {
-			codebaseIndexEnabled: true,
-			codebaseIndexQdrantUrl: "http://localhost:6333",
-			codebaseIndexEmbedderProvider: "openai",
-			codebaseIndexEmbedderBaseUrl: "",
-			codebaseIndexEmbedderModelId: "",
-			codebaseIndexSearchMinScore: undefined,
-			codebaseIndexSearchMaxResults: undefined,
+		// Load configuration from workspace storage first, then fall back to global storage for migration
+		let codebaseIndexConfig = this.contextProxy?.getWorkspaceState("codebaseIndexConfig")
+
+		// If no workspace config exists, check for global config and migrate it
+		if (!codebaseIndexConfig) {
+			const globalConfig = this.contextProxy?.getGlobalState("codebaseIndexConfig")
+			if (globalConfig) {
+				// Migrate global config to workspace
+				this.contextProxy?.updateWorkspaceState("codebaseIndexConfig", globalConfig)
+				codebaseIndexConfig = globalConfig
+			} else {
+				// Use default configuration
+				codebaseIndexConfig = {
+					codebaseIndexEnabled: true,
+					codebaseIndexQdrantUrl: "http://localhost:6333",
+					codebaseIndexEmbedderProvider: "openai",
+					codebaseIndexEmbedderBaseUrl: "",
+					codebaseIndexEmbedderModelId: "",
+					codebaseIndexSearchMinScore: undefined,
+					codebaseIndexSearchMaxResults: undefined,
+				}
+			}
 		}
 
 		const {