diff --git a/packages/types/src/experiment.ts b/packages/types/src/experiment.ts
index 10384db8ed..b455a170b7 100644
--- a/packages/types/src/experiment.ts
+++ b/packages/types/src/experiment.ts
@@ -6,7 +6,7 @@ import type { Keys, Equals, AssertEqual } from "./type-fu.js"
  * ExperimentId
  */
 
-export const experimentIds = ["powerSteering", "multiFileApplyDiff"] as const
+export const experimentIds = ["powerSteering", "multiFileApplyDiff", "readFileDeduplication"] as const
 
 export const experimentIdsSchema = z.enum(experimentIds)
 
@@ -19,6 +19,7 @@ export type ExperimentId = z.infer<typeof experimentIdsSchema>
 export const experimentsSchema = z.object({
 	powerSteering: z.boolean().optional(),
 	multiFileApplyDiff: z.boolean().optional(),
+	readFileDeduplication: z.boolean().optional(),
 })
 
 export type Experiments = z.infer<typeof experimentsSchema>
diff --git a/src/core/task/Task.ts b/src/core/task/Task.ts
index fe8fd0f68f..57d639b7cd 100644
--- a/src/core/task/Task.ts
+++ b/src/core/task/Task.ts
@@ -340,6 +340,140 @@ export class Task extends EventEmitter<ClineEvents> {
 		await this.saveApiConversationHistory()
 	}
 
+	public async deduplicateReadFileHistory(): Promise<void> {
+		// Check if the experimental feature is enabled
+		const state = await this.providerRef.deref()?.getState()
+		if (!state?.experiments || !experiments.isEnabled(state.experiments, EXPERIMENT_IDS.READ_FILE_DEDUPLICATION)) {
+			return
+		}
+
+		// Track files we've seen and their most recent location
+		const fileLastSeen = new Map<string, { messageIndex: number; blockIndex: number }>()
+		const blocksToRemove = new Map<number, Set<number>>() // messageIndex -> Set of blockIndices to remove
+
+		// Iterate through messages in reverse order (newest first)
+		for (let i = this.apiConversationHistory.length - 1; i >= 0; i--) {
+			const message = this.apiConversationHistory[i]
+
+			// Only process user messages
+			if (message.role !== "user") continue
+
+			const content = Array.isArray(message.content) ? message.content : [{ type: "text", text: message.content }]
+
+			// Track blocks to remove within this message
+			const blockIndicesToRemove = new Set<number>()
+
+			// Iterate through blocks in reverse order within the message
+			for (let j = content.length - 1; j >= 0; j--) {
+				const block = content[j]
+				if (block.type !== "text") continue
+
+				const text = block.text
+
+				// Check if this is a read_file result
+				if (!text.startsWith("[read_file") || !text.includes("Result:")) continue
+
+				// Extract file paths from the result
+				const filePaths = this.extractFilePathsFromReadResult(text)
+
+				// For each file path, check if we've seen it before
+				for (const filePath of filePaths) {
+					const lastSeen = fileLastSeen.get(filePath)
+					if (lastSeen) {
+						// We've seen this file before
+						if (lastSeen.messageIndex === i) {
+							// It's in the same message, mark the older block for removal
+							blockIndicesToRemove.add(j)
+						} else {
+							// It's in a different message, mark this specific block for removal
+							if (!blocksToRemove.has(i)) {
+								blocksToRemove.set(i, new Set())
+							}
+							blocksToRemove.get(i)!.add(j)
+						}
+					} else {
+						// First time seeing this file (going backwards), record it
+						fileLastSeen.set(filePath, { messageIndex: i, blockIndex: j })
+					}
+				}
+			}
+
+			// If we have blocks to remove from this message, add them to the map
+			if (blockIndicesToRemove.size > 0) {
+				if (!blocksToRemove.has(i)) {
+					blocksToRemove.set(i, new Set())
+				}
+				blockIndicesToRemove.forEach((idx) => blocksToRemove.get(i)!.add(idx))
+			}
+		}
+
+		// Apply the removals
+		if (blocksToRemove.size > 0) {
+			let modified = false
+
+			// Create a new conversation history with duplicates removed
+			this.apiConversationHistory = this.apiConversationHistory
+				.map((message, messageIndex) => {
+					const blocksToRemoveForMessage = blocksToRemove.get(messageIndex)
+					if (!blocksToRemoveForMessage || blocksToRemoveForMessage.size === 0) {
+						return message
+					}
+
+					// This message has blocks to remove
+					const content = Array.isArray(message.content)
+						? message.content
+						: [{ type: "text", text: message.content }]
+
+					// Check if this is a string content (legacy format)
+					if (!Array.isArray(message.content)) {
+						// For string content, we can only remove the entire message if it's a duplicate
+						if (blocksToRemoveForMessage.has(0)) {
+							modified = true
+							return null
+						}
+						return message
+					}
+
+					const newContent = content.filter((_, blockIndex) => !blocksToRemoveForMessage.has(blockIndex))
+
+					// If all content was removed, filter out this message entirely
+					if (newContent.length === 0) {
+						modified = true
+						return null
+					}
+
+					modified = true
+					return { ...message, content: newContent }
+				})
+				.filter((message) => message !== null) as ApiMessage[]
+
+			if (modified) {
+				await this.saveApiConversationHistory()
+			}
+		}
+	}
+
+	private extractFilePathsFromReadResult(text: string): string[] {
+		const paths: string[] = []
+
+		// Match file paths in the XML structure
+		// Handles both single file and multi-file formats
+		const filePathRegex = /<file>\s*<path>([^<]+)<\/path>/g
+		let match
+
+		while ((match = filePathRegex.exec(text)) !== null) {
+			paths.push(match[1].trim())
+		}
+
+		// Also handle legacy format where path might be in the header
+		const headerMatch = text.match(/\[read_file for '([^']+)'\]/)
+		if (headerMatch && paths.length === 0) {
+			paths.push(headerMatch[1])
+		}
+
+		return paths
+	}
+
 	private async saveApiConversationHistory() {
 		try {
 			await saveApiMessages({
@@ -1254,6 +1388,9 @@ export class Task extends EventEmitter<ClineEvents> {
 		await this.addToApiConversationHistory({ role: "user", content: finalUserContent })
 		TelemetryService.instance.captureConversationMessage(this.taskId, "user")
 
+		// Deduplicate read_file history after adding new content
+		await this.deduplicateReadFileHistory()
+
 		// Since we sent off a placeholder api_req_started message to update the
 		// webview while waiting to actually start the API request (to load
 		// potential details for example), we need to update the text of that
diff --git a/src/core/task/__tests__/Task.spec.ts b/src/core/task/__tests__/Task.spec.ts
index 9aa5a8d7a8..130e9a623a 100644
--- a/src/core/task/__tests__/Task.spec.ts
+++ b/src/core/task/__tests__/Task.spec.ts
@@ -1493,5 +1493,523 @@ describe("Cline", () => {
 				expect(noModelTask.apiConfiguration.apiProvider).toBe("openai")
 			})
 		})
+
+		describe("deduplicateReadFileHistory", () => {
+			let mockProvider: any
+			let mockApiConfig: any
+
+			beforeEach(() => {
+				vi.clearAllMocks()
+
+				mockApiConfig = {
+					apiProvider: "anthropic",
+					apiKey: "test-key",
+				}
+
+				mockProvider = {
+					context: {
+						globalStorageUri: { fsPath: "/test/storage" },
+					},
+					getState: vi.fn(),
+					postStateToWebview: vi.fn().mockResolvedValue(undefined),
+					postMessageToWebview: vi.fn().mockResolvedValue(undefined),
+					updateTaskHistory: vi.fn().mockResolvedValue(undefined),
+				}
+			})
+
+			it("should not deduplicate when experiment is disabled", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: false,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add duplicate read_file results
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>content1</content></file></files>",
+							},
+						],
+						ts: Date.now(),
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>content2</content></file></files>",
+							},
+						],
+						ts: Date.now(),
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should not remove any messages when experiment is disabled
+				expect(task.apiConversationHistory.length).toBe(2)
+			})
+
+			it("should deduplicate single file reads keeping the most recent", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add duplicate read_file results
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>old content</content></file></files>",
+							},
+						],
+						ts: Date.now() - 10000,
+					},
+					{
+						role: "assistant",
+						content: [{ type: "text", text: "I see the file content." }],
+						ts: Date.now() - 9000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>new content</content></file></files>",
+							},
+						],
+						ts: Date.now() - 5000,
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should remove the older duplicate
+				expect(task.apiConversationHistory.length).toBe(2)
+				expect(task.apiConversationHistory[0].role).toBe("assistant")
+				const content = task.apiConversationHistory[1].content
+				if (Array.isArray(content)) {
+					expect((content[0] as any).text).toContain("new content")
+				}
+			})
+
+			it("should handle multi-file reads correctly", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add multi-file read results
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'file1.ts', 'file2.ts'] Result:\n<files><file><path>file1.ts</path><content>content1</content></file><file><path>file2.ts</path><content>content2</content></file></files>",
+							},
+						],
+						ts: Date.now() - 10000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'file1.ts'] Result:\n<files><file><path>file1.ts</path><content>new content1</content></file></files>",
+							},
+						],
+						ts: Date.now() - 5000,
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should remove the older multi-file read that contains file1.ts
+				expect(task.apiConversationHistory.length).toBe(1)
+				const content = task.apiConversationHistory[0].content
+				if (Array.isArray(content)) {
+					expect((content[0] as any).text).toContain("new content1")
+				}
+			})
+
+			it("should handle legacy read_file format", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add legacy format read_file results
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'legacy.ts'] Result:\nFile content without XML wrapper",
+							},
+						],
+						ts: Date.now() - 10000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'legacy.ts'] Result:\n<files><file><path>legacy.ts</path><content>new content</content></file></files>",
+							},
+						],
+						ts: Date.now() - 5000,
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should remove the older legacy format
+				expect(task.apiConversationHistory.length).toBe(1)
+				const content = task.apiConversationHistory[0].content
+				if (Array.isArray(content)) {
+					expect((content[0] as any).text).toContain("new content")
+				}
+			})
+
+			it("should preserve non-read_file messages", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add mixed messages
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [{ type: "text", text: "Regular user message" }],
+						ts: Date.now() - 10000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path></file></files>",
+							},
+							{ type: "image", source: { type: "base64", media_type: "image/png", data: "base64data" } },
+						],
+						ts: Date.now() - 9000,
+					},
+					{
+						role: "assistant",
+						content: [{ type: "text", text: "Assistant response" }],
+						ts: Date.now() - 8000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path></file></files>",
+							},
+						],
+						ts: Date.now() - 7000,
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should preserve all messages but remove only the older duplicate read_file block
+				expect(task.apiConversationHistory.length).toBe(4)
+
+				// First message should be unchanged
+				const content0 = task.apiConversationHistory[0].content
+				if (Array.isArray(content0)) {
+					expect((content0[0] as any).text).toBe("Regular user message")
+				}
+
+				// Second message should only have the image block (read_file removed)
+				const content1 = task.apiConversationHistory[1].content
+				if (Array.isArray(content1)) {
+					expect(content1.length).toBe(1)
+					expect((content1[0] as any).type).toBe("image")
+				}
+
+				// Third message (assistant) should be unchanged
+				expect(task.apiConversationHistory[2].role).toBe("assistant")
+
+				// Fourth message should have the most recent read_file
+				const content3 = task.apiConversationHistory[3].content
+				if (Array.isArray(content3)) {
+					expect((content3[0] as any).text).toContain("[read_file for 'test.ts']")
+				}
+			})
+
+			it("should handle multiple different files without deduplication", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add different file reads
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'file1.ts'] Result:\n<files><file><path>file1.ts</path><content>content1</content></file></files>",
+							},
+						],
+						ts: Date.now() - 10000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'file2.ts'] Result:\n<files><file><path>file2.ts</path><content>content2</content></file></files>",
+							},
+						],
+						ts: Date.now() - 5000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'file3.ts'] Result:\n<files><file><path>file3.ts</path><content>content3</content></file></files>",
+							},
+						],
+						ts: Date.now() - 1000,
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should not remove any messages as they are all different files
+				expect(task.apiConversationHistory.length).toBe(3)
+			})
+
+			it("should handle empty conversation history", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				task.apiConversationHistory = []
+
+				await task.deduplicateReadFileHistory()
+
+				// Should not throw and history should remain empty
+				expect(task.apiConversationHistory.length).toBe(0)
+			})
+
+			it("should handle messages with string content", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add messages with string content (legacy format)
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content:
+							"[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>old</content></file></files>",
+						ts: Date.now() - 10000,
+					},
+					{
+						role: "user",
+						content:
+							"[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>new</content></file></files>",
+						ts: Date.now() - 5000,
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should handle string content and remove the older duplicate
+				expect(task.apiConversationHistory.length).toBe(1)
+				expect(task.apiConversationHistory[0].content).toContain("new")
+			})
+
+			it("should handle multiple read_file results in the same message", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add a message with multiple read_file results for the same file
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>content1</content></file></files>",
+							},
+							{
+								type: "text",
+								text: "Some other content",
+							},
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>content2</content></file></files>",
+							},
+							{
+								type: "text",
+								text: "[read_file for 'test.ts'] Result:\n<files><file><path>test.ts</path><content>content3</content></file></files>",
+							},
+						],
+						ts: Date.now(),
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should keep only the most recent read (last one) and the non-read_file content
+				expect(task.apiConversationHistory.length).toBe(1)
+				const content = task.apiConversationHistory[0].content
+				if (Array.isArray(content)) {
+					expect(content.length).toBe(2) // "Some other content" and the last read_file
+					expect((content[0] as any).text).toBe("Some other content")
+					expect((content[1] as any).text).toContain("content3")
+				}
+			})
+
+			it("should handle duplicates across different messages and within same message", async () => {
+				mockProvider.getState.mockResolvedValue({
+					experiments: {
+						[EXPERIMENT_IDS.READ_FILE_DEDUPLICATION]: true,
+					},
+				})
+
+				const task = new Task({
+					provider: mockProvider,
+					apiConfiguration: mockApiConfig,
+					task: "test task",
+					startTask: false,
+				})
+
+				// Add messages with duplicates both across messages and within a message
+				task.apiConversationHistory = [
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'file1.ts'] Result:\n<files><file><path>file1.ts</path><content>old1</content></file></files>",
+							},
+						],
+						ts: Date.now() - 10000,
+					},
+					{
+						role: "user",
+						content: [
+							{
+								type: "text",
+								text: "[read_file for 'file1.ts'] Result:\n<files><file><path>file1.ts</path><content>old2</content></file></files>",
+							},
+							{
+								type: "text",
+								text: "[read_file for 'file2.ts'] Result:\n<files><file><path>file2.ts</path><content>content2</content></file></files>",
+							},
+							{
+								type: "text",
+								text: "[read_file for 'file1.ts'] Result:\n<files><file><path>file1.ts</path><content>newest</content></file></files>",
+							},
+						],
+						ts: Date.now() - 5000,
+					},
+				]
+
+				await task.deduplicateReadFileHistory()
+
+				// Should remove the first message entirely and keep only the last read of file1.ts in the second message
+				expect(task.apiConversationHistory.length).toBe(1)
+				const content = task.apiConversationHistory[0].content
+				if (Array.isArray(content)) {
+					expect(content.length).toBe(2) // file2.ts and the newest file1.ts
+					expect((content[0] as any).text).toContain("file2.ts")
+					expect((content[1] as any).text).toContain("newest")
+				}
+			})
+		})
 	})
 })
diff --git a/src/shared/__tests__/experiments.spec.ts b/src/shared/__tests__/experiments.spec.ts
index 4a8f06d62a..cbd0d1d730 100644
--- a/src/shared/__tests__/experiments.spec.ts
+++ b/src/shared/__tests__/experiments.spec.ts
@@ -23,11 +23,21 @@ describe("experiments", () => {
 		})
 	})
 
+	describe("READ_FILE_DEDUPLICATION", () => {
+		it("is configured correctly", () => {
+			expect(EXPERIMENT_IDS.READ_FILE_DEDUPLICATION).toBe("readFileDeduplication")
+			expect(experimentConfigsMap.READ_FILE_DEDUPLICATION).toMatchObject({
+				enabled: false,
+			})
+		})
+	})
+
 	describe("isEnabled", () => {
 		it("returns false when POWER_STEERING experiment is not enabled", () => {
 			const experiments: Record<ExperimentId, boolean> = {
 				powerSteering: false,
 				multiFileApplyDiff: false,
+				readFileDeduplication: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.POWER_STEERING)).toBe(false)
 		})
@@ -36,6 +46,7 @@ describe("experiments", () => {
 			const experiments: Record<ExperimentId, boolean> = {
 				powerSteering: true,
 				multiFileApplyDiff: false,
+				readFileDeduplication: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.POWER_STEERING)).toBe(true)
 		})
@@ -44,8 +55,27 @@ describe("experiments", () => {
 			const experiments: Record<ExperimentId, boolean> = {
 				powerSteering: false,
 				multiFileApplyDiff: false,
+				readFileDeduplication: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.POWER_STEERING)).toBe(false)
 		})
+
+		it("returns false when READ_FILE_DEDUPLICATION experiment is not enabled", () => {
+			const experiments: Record<ExperimentId, boolean> = {
+				powerSteering: false,
+				multiFileApplyDiff: false,
+				readFileDeduplication: false,
+			}
+			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.READ_FILE_DEDUPLICATION)).toBe(false)
+		})
+
+		it("returns true when experiment READ_FILE_DEDUPLICATION is enabled", () => {
+			const experiments: Record<ExperimentId, boolean> = {
+				powerSteering: false,
+				multiFileApplyDiff: false,
+				readFileDeduplication: true,
+			}
+			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.READ_FILE_DEDUPLICATION)).toBe(true)
+		})
 	})
 })
diff --git a/src/shared/experiments.ts b/src/shared/experiments.ts
index 1edadf654f..f5f490c228 100644
--- a/src/shared/experiments.ts
+++ b/src/shared/experiments.ts
@@ -3,6 +3,7 @@ import type { AssertEqual, Equals, Keys, Values, ExperimentId, Experiments } fro
 export const EXPERIMENT_IDS = {
 	MULTI_FILE_APPLY_DIFF: "multiFileApplyDiff",
 	POWER_STEERING: "powerSteering",
+	READ_FILE_DEDUPLICATION: "readFileDeduplication",
 } as const satisfies Record<string, ExperimentId>
 
 type _AssertExperimentIds = AssertEqual<Equals<ExperimentId, Values<typeof EXPERIMENT_IDS>>>
@@ -16,6 +17,7 @@ interface ExperimentConfig {
 export const experimentConfigsMap: Record<ExperimentKey, ExperimentConfig> = {
 	MULTI_FILE_APPLY_DIFF: { enabled: false },
 	POWER_STEERING: { enabled: false },
+	READ_FILE_DEDUPLICATION: { enabled: false },
 }
 
 export const experimentDefault = Object.fromEntries(
diff --git a/webview-ui/src/context/__tests__/ExtensionStateContext.spec.tsx b/webview-ui/src/context/__tests__/ExtensionStateContext.spec.tsx
index 1e5867d3fc..abe1725003 100644
--- a/webview-ui/src/context/__tests__/ExtensionStateContext.spec.tsx
+++ b/webview-ui/src/context/__tests__/ExtensionStateContext.spec.tsx
@@ -226,6 +226,7 @@ describe("mergeExtensionState", () => {
 				disableCompletionCommand: false,
 				concurrentFileReads: true,
 				multiFileApplyDiff: true,
+				readFileDeduplication: false,
 			} as Record<ExperimentId, boolean>,
 		}