diff --git a/src/core/task/Task.ts b/src/core/task/Task.ts
index 1b63ba9f4cc..6e52d7a7758 100644
--- a/src/core/task/Task.ts
+++ b/src/core/task/Task.ts
@@ -100,7 +100,6 @@ export type ClineEvents = {
 export type TaskOptions = {
 	provider: ClineProvider
 	apiConfiguration: ProviderSettings
-	customInstructions?: string
 	enableDiff?: boolean
 	enableCheckpoints?: boolean
 	fuzzyMatchThreshold?: number
@@ -134,7 +133,6 @@ export class Task extends EventEmitter<ClineEvents> {
 	isPaused: boolean = false
 	pausedModeSlug: string = defaultModeSlug
 	private pauseInterval: NodeJS.Timeout | undefined
-	customInstructions?: string
 
 	// API
 	readonly apiConfiguration: ProviderSettings
@@ -194,7 +192,6 @@ export class Task extends EventEmitter<ClineEvents> {
 	constructor({
 		provider,
 		apiConfiguration,
-		customInstructions,
 		enableDiff = false,
 		enableCheckpoints = true,
 		fuzzyMatchThreshold = 1.0,
@@ -234,7 +231,6 @@ export class Task extends EventEmitter<ClineEvents> {
 
 		this.urlContentFetcher = new UrlContentFetcher(provider.context)
 		this.browserSession = new BrowserSession(provider.context)
-		this.customInstructions = customInstructions
 		this.diffEnabled = enableDiff
 		this.fuzzyMatchThreshold = fuzzyMatchThreshold
 		this.consecutiveMistakeLimit = consecutiveMistakeLimit
@@ -1417,6 +1413,7 @@ export class Task extends EventEmitter<ClineEvents> {
 			browserViewportSize,
 			mode,
 			customModePrompts,
+			customInstructions,
 			experiments,
 			enableMcpServerCreation,
 			browserToolEnabled,
@@ -1442,7 +1439,7 @@ export class Task extends EventEmitter<ClineEvents> {
 				mode,
 				customModePrompts,
 				customModes,
-				this.customInstructions,
+				customInstructions,
 				this.diffEnabled,
 				experiments,
 				enableMcpServerCreation,
diff --git a/src/core/task/__tests__/Task.test.ts b/src/core/task/__tests__/Task.test.ts
index a5a6efa63e2..84756b8a2de 100644
--- a/src/core/task/__tests__/Task.test.ts
+++ b/src/core/task/__tests__/Task.test.ts
@@ -275,13 +275,11 @@ describe("Cline", () => {
 			const cline = new Task({
 				provider: mockProvider,
 				apiConfiguration: mockApiConfig,
-				customInstructions: "custom instructions",
 				fuzzyMatchThreshold: 0.95,
 				task: "test task",
 				startTask: false,
 			})
 
-			expect(cline.customInstructions).toBe("custom instructions")
 			expect(cline.diffEnabled).toBe(false)
 		})
 
@@ -289,7 +287,6 @@ describe("Cline", () => {
 			const cline = new Task({
 				provider: mockProvider,
 				apiConfiguration: mockApiConfig,
-				customInstructions: "custom instructions",
 				enableDiff: true,
 				fuzzyMatchThreshold: 0.95,
 				task: "test task",
diff --git a/src/core/webview/ClineProvider.ts b/src/core/webview/ClineProvider.ts
index 84366274aaf..1c63c951968 100644
--- a/src/core/webview/ClineProvider.ts
+++ b/src/core/webview/ClineProvider.ts
@@ -18,7 +18,7 @@ import { supportPrompt } from "../../shared/support-prompt"
 import { GlobalFileNames } from "../../shared/globalFileNames"
 import { HistoryItem } from "../../shared/HistoryItem"
 import { ExtensionMessage } from "../../shared/ExtensionMessage"
-import { Mode, PromptComponent, defaultModeSlug } from "../../shared/modes"
+import { Mode, defaultModeSlug } from "../../shared/modes"
 import { experimentDefault } from "../../shared/experiments"
 import { formatLanguage } from "../../shared/language"
 import { Terminal } from "../../integrations/terminal/Terminal"
@@ -449,33 +449,21 @@ export class ClineProvider extends EventEmitter<ClineProviderEvents> implements
 		options: Partial<
 			Pick<
 				TaskOptions,
-				| "customInstructions"
-				| "enableDiff"
-				| "enableCheckpoints"
-				| "fuzzyMatchThreshold"
-				| "consecutiveMistakeLimit"
-				| "experiments"
+				"enableDiff" | "enableCheckpoints" | "fuzzyMatchThreshold" | "consecutiveMistakeLimit" | "experiments"
 			>
 		> = {},
 	) {
 		const {
 			apiConfiguration,
-			customModePrompts,
 			diffEnabled: enableDiff,
 			enableCheckpoints,
 			fuzzyMatchThreshold,
-			mode,
-			customInstructions: globalInstructions,
 			experiments,
 		} = await this.getState()
 
-		const modePrompt = customModePrompts?.[mode] as PromptComponent
-		const effectiveInstructions = [globalInstructions, modePrompt?.customInstructions].filter(Boolean).join("\n\n")
-
 		const cline = new Task({
 			provider: this,
 			apiConfiguration,
-			customInstructions: effectiveInstructions,
 			enableDiff,
 			enableCheckpoints,
 			fuzzyMatchThreshold,
@@ -503,22 +491,15 @@ export class ClineProvider extends EventEmitter<ClineProviderEvents> implements
 
 		const {
 			apiConfiguration,
-			customModePrompts,
 			diffEnabled: enableDiff,
 			enableCheckpoints,
 			fuzzyMatchThreshold,
-			mode,
-			customInstructions: globalInstructions,
 			experiments,
 		} = await this.getState()
 
-		const modePrompt = customModePrompts?.[mode] as PromptComponent
-		const effectiveInstructions = [globalInstructions, modePrompt?.customInstructions].filter(Boolean).join("\n\n")
-
 		const cline = new Task({
 			provider: this,
 			apiConfiguration,
-			customInstructions: effectiveInstructions,
 			enableDiff,
 			enableCheckpoints,
 			fuzzyMatchThreshold,
@@ -962,11 +943,6 @@ export class ClineProvider extends EventEmitter<ClineProviderEvents> implements
 	async updateCustomInstructions(instructions?: string) {
 		// User may be clearing the field.
 		await this.updateGlobalState("customInstructions", instructions || undefined)
-
-		if (this.getCurrentCline()) {
-			this.getCurrentCline()!.customInstructions = instructions || undefined
-		}
-
 		await this.postStateToWebview()
 	}
 
diff --git a/src/core/webview/__tests__/ClineProvider.test.ts b/src/core/webview/__tests__/ClineProvider.test.ts
index 3bd3a11db45..1f950808a13 100644
--- a/src/core/webview/__tests__/ClineProvider.test.ts
+++ b/src/core/webview/__tests__/ClineProvider.test.ts
@@ -806,45 +806,6 @@ describe("ClineProvider", () => {
 		expect(mockPostMessage).toHaveBeenCalled()
 	})
 
-	test("uses mode-specific custom instructions in Cline initialization", async () => {
-		// Setup mock state
-		const modeCustomInstructions = "Code mode instructions"
-		const mockApiConfig = {
-			apiProvider: "openrouter",
-		}
-
-		jest.spyOn(provider, "getState").mockResolvedValue({
-			apiConfiguration: mockApiConfig,
-			customModePrompts: {
-				code: { customInstructions: modeCustomInstructions },
-			},
-			mode: "code",
-			diffEnabled: true,
-			enableCheckpoints: false,
-			fuzzyMatchThreshold: 1.0,
-			experiments: experimentDefault,
-		} as any)
-
-		// Initialize Cline with a task
-		await provider.initClineWithTask("Test task")
-
-		// Verify Cline was initialized with mode-specific instructions
-		expect(Task).toHaveBeenCalledWith({
-			provider,
-			apiConfiguration: mockApiConfig,
-			customInstructions: modeCustomInstructions,
-			enableDiff: true,
-			enableCheckpoints: false,
-			fuzzyMatchThreshold: 1.0,
-			task: "Test task",
-			experiments: experimentDefault,
-			rootTask: undefined,
-			parentTask: undefined,
-			taskNumber: 1,
-			onCreated: expect.any(Function),
-		})
-	})
-
 	test("handles mode-specific custom instructions updates", async () => {
 		await provider.resolveWebviewView(mockWebviewView)
 		const messageHandler = (mockWebviewView.webview.onDidReceiveMessage as jest.Mock).mock.calls[0][0]