I18n

.roomodes

@@ -0,0 +1,29 @@
+{
+  "customModes": [
+    {
+      "slug": "translate",
+      "name": "Translate",
+      "roleDefinition": "You are Roo, a linguistic specialist focused on translating and managing localization files. Your responsibility is to help maintain and update translation files for the application, ensuring consistency and accuracy across all language resources.",
+      "groups": [
+        "read",
+        ["edit", { "fileRegex": "src/i18n/locales/", "description": "Translation files only" }]
+      ],
+      "customInstructions": "When translating content:\n- Maintain consistent terminology across all translations\n- Respect the JSON structure of translation files\n- Consider context when translating UI strings\n- Watch for placeholders (like {{variable}}) and preserve them in translations\n- Be mindful of text length in UI elements when translating to languages that might require more characters\n- If you need context for a translation, use read_file to examine the components using these strings"
+    },
+    {
+      "slug": "test",
+      "name": "Test",
+      "roleDefinition": "You are Roo, a Jest testing specialist with deep expertise in:\n- Writing and maintaining Jest test suites\n- Test-driven development (TDD) practices\n- Mocking and stubbing with Jest\n- Integration testing strategies\n- TypeScript testing patterns\n- Code coverage analysis\n- Test performance optimization\n\nYour focus is on maintaining high test quality and coverage across the codebase, working primarily with:\n- Test files in __tests__ directories\n- Mock implementations in __mocks__\n- Test utilities and helpers\n- Jest configuration and setup\n\nYou ensure tests are:\n- Well-structured and maintainable\n- Following Jest best practices\n- Properly typed with TypeScript\n- Providing meaningful coverage\n- Using appropriate mocking strategies",
+      "groups": [
+        "read",
+        "browser",
+        "command",
+        ["edit", {
+          "fileRegex": "(__tests__/.*|__mocks__/.*|\\.test\\.(ts|tsx|js|jsx)$|/test/.*|jest\\.config\\.(js|ts)$)",
+          "description": "Test files, mocks, and Jest configuration"
+        }]
+      ],
+      "customInstructions": "When writing tests:\n- Always use describe/it blocks for clear test organization\n- Include meaningful test descriptions\n- Use beforeEach/afterEach for proper test isolation\n- Implement proper error cases\n- Add JSDoc comments for complex test scenarios\n- Ensure mocks are properly typed\n- Verify both positive and negative test cases"
+    }
+  ]
+}

src/__mocks__/vscode.js

@@ -1,4 +1,13 @@
 const vscode = {
+	env: {
+		language: "en", // Default language for tests
+		appName: "Visual Studio Code Test",
+		appHost: "desktop",
+		appRoot: "/test/path",
+		machineId: "test-machine-id",
+		sessionId: "test-session-id",
+		shell: "/bin/zsh",
+	},
 	window: {
 		showInformationMessage: jest.fn(),
 		showErrorMessage: jest.fn(),

src/core/Cline.ts

@@ -70,6 +70,7 @@ import { truncateConversationIfNeeded } from "./sliding-window"
 import { ClineProvider } from "./webview/ClineProvider"
 import { detectCodeOmission } from "../integrations/editor/detect-omission"
 import { BrowserSession } from "../services/browser/BrowserSession"
+import { formatLanguage } from "../shared/language"
 import { McpHub } from "../services/mcp/McpHub"
 import crypto from "crypto"
 import { insertGroups } from "./diff/insert-groups"
@@ -1102,7 +1103,6 @@ export class Cline {
 			browserViewportSize,
 			mode,
 			customModePrompts,
-			preferredLanguage,
 			experiments,
 			enableMcpServerCreation,
 			browserToolEnabled,
@@ -1124,7 +1124,6 @@ export class Cline {
 				customModePrompts,
 				customModes,
 				this.customInstructions,
-				preferredLanguage,
 				this.diffEnabled,
 				experiments,
 				enableMcpServerCreation,
@@ -3665,13 +3664,12 @@ export class Cline {
 			customModePrompts,
 			experiments = {} as Record<ExperimentId, boolean>,
 			customInstructions: globalCustomInstructions,
-			preferredLanguage,
 		} = (await this.providerRef.deref()?.getState()) ?? {}
 		const currentMode = mode ?? defaultModeSlug
 		const modeDetails = await getFullModeDetails(currentMode, customModes, customModePrompts, {
 			cwd,
 			globalCustomInstructions,
-			preferredLanguage,
+			language: formatLanguage(vscode.env.language),
 		})
 		details += `\n\n# Current Mode\n`
 		details += `<slug>${currentMode}</slug>\n`

src/core/prompts/__tests__/custom-system-prompt.test.ts

@@ -46,8 +46,6 @@ const mockContext = {
 } as unknown as vscode.ExtensionContext
 
 describe("File-Based Custom System Prompt", () => {
-	const experiments = {}
-
 	beforeEach(() => {
 		// Reset mocks before each test
 		jest.clearAllMocks()
@@ -66,18 +64,17 @@ describe("File-Based Custom System Prompt", () => {
 		const prompt = await SYSTEM_PROMPT(
 			mockContext,
 			"test/path", // Using a relative path without leading slash
-			false,
-			undefined,
-			undefined,
-			undefined,
-			defaultModeSlug,
-			customModePrompts,
-			undefined,
-			undefined,
-			undefined,
-			undefined,
-			experiments,
-			true,
+			false, // supportsComputerUse
+			undefined, // mcpHub
+			undefined, // diffStrategy
+			undefined, // browserViewportSize
+			defaultModeSlug, // mode
+			customModePrompts, // customModePrompts
+			undefined, // customModes
+			undefined, // globalCustomInstructions
+			undefined, // diffEnabled
+			undefined, // experiments
+			true, // enableMcpServerCreation
 		)
 
 		// Should contain default sections
@@ -101,26 +98,24 @@ describe("File-Based Custom System Prompt", () => {
 		const prompt = await SYSTEM_PROMPT(
 			mockContext,
 			"test/path", // Using a relative path without leading slash
-			false,
-			undefined,
-			undefined,
-			undefined,
-			defaultModeSlug,
-			undefined,
-			undefined,
-			undefined,
-			undefined,
-			undefined,
-			experiments,
-			true,
+			false, // supportsComputerUse
+			undefined, // mcpHub
+			undefined, // diffStrategy
+			undefined, // browserViewportSize
+			defaultModeSlug, // mode
+			undefined, // customModePrompts
+			undefined, // customModes
+			undefined, // globalCustomInstructions
+			undefined, // diffEnabled
+			undefined, // experiments
+			true, // enableMcpServerCreation
 		)
 
 		// Should contain role definition and file-based system prompt
 		expect(prompt).toContain(modes[0].roleDefinition)
 		expect(prompt).toContain(fileCustomSystemPrompt)
 
 		// Should not contain any of the default sections
-		expect(prompt).not.toContain("TOOL USE")
 		expect(prompt).not.toContain("CAPABILITIES")
 		expect(prompt).not.toContain("MODES")
 	})
@@ -146,26 +141,24 @@ describe("File-Based Custom System Prompt", () => {
 		const prompt = await SYSTEM_PROMPT(
 			mockContext,
 			"test/path", // Using a relative path without leading slash
-			false,
-			undefined,
-			undefined,
-			undefined,
-			defaultModeSlug,
-			customModePrompts,
-			undefined,
-			undefined,
-			undefined,
-			undefined,
-			experiments,
-			true,
+			false, // supportsComputerUse
+			undefined, // mcpHub
+			undefined, // diffStrategy
+			undefined, // browserViewportSize
+			defaultModeSlug, // mode
+			customModePrompts, // customModePrompts
+			undefined, // customModes
+			undefined, // globalCustomInstructions
+			undefined, // diffEnabled
+			undefined, // experiments
+			true, // enableMcpServerCreation
 		)
 
 		// Should contain custom role definition and file-based system prompt
 		expect(prompt).toContain(customRoleDefinition)
 		expect(prompt).toContain(fileCustomSystemPrompt)
 
 		// Should not contain any of the default sections
-		expect(prompt).not.toContain("TOOL USE")
 		expect(prompt).not.toContain("CAPABILITIES")
 		expect(prompt).not.toContain("MODES")
 	})

src/core/prompts/__tests__/sections.test.ts

@@ -3,20 +3,20 @@ import { getCapabilitiesSection } from "../sections/capabilities"
 import { DiffStrategy, DiffResult } from "../../diff/types"
 
 describe("addCustomInstructions", () => {
-	test("adds preferred language to custom instructions", async () => {
+	test("adds vscode language to custom instructions", async () => {
 		const result = await addCustomInstructions(
 			"mode instructions",
 			"global instructions",
 			"/test/path",
 			"test-mode",
-			{ preferredLanguage: "French" },
+			{ language: "fr" },
 		)
 
 		expect(result).toContain("Language Preference:")
-		expect(result).toContain("You should always speak and think in the French language")
+		expect(result).toContain('You should always speak and think in the "fr" language')
 	})
 
-	test("works without preferred language", async () => {
+	test("works without vscode language", async () => {
 		const result = await addCustomInstructions(
 			"mode instructions",
 			"global instructions",