feat: remove assistantMessageParser experiment flag and enable for all users (#7300)

- Remove assistantMessageParser from experiment definitions in packages/types
- Remove ASSISTANT_MESSAGE_PARSER from shared experiments configuration
- Update Task.ts to always initialize and use AssistantMessageParser
- Remove conditional logic that checked for experiment flag
- Remove unused parseAssistantMessage import
- Update test files to remove assistantMessageParser references
- All tests passing successfully

Co-authored-by: Roo Code <roomote@roocode.com>

packages/types/src/experiment.ts

@@ -6,12 +6,7 @@ import type { Keys, Equals, AssertEqual } from "./type-fu.js"
  * ExperimentId
  */
 
-export const experimentIds = [
-	"powerSteering",
-	"multiFileApplyDiff",
-	"preventFocusDisruption",
-	"assistantMessageParser",
-] as const
+export const experimentIds = ["powerSteering", "multiFileApplyDiff", "preventFocusDisruption"] as const
 
 export const experimentIdsSchema = z.enum(experimentIds)
 
@@ -25,7 +20,6 @@ export const experimentsSchema = z.object({
 	powerSteering: z.boolean().optional(),
 	multiFileApplyDiff: z.boolean().optional(),
 	preventFocusDisruption: z.boolean().optional(),
-	assistantMessageParser: z.boolean().optional(),
 })
 
 export type Experiments = z.infer<typeof experimentsSchema>

src/core/task/Task.ts

@@ -80,7 +80,7 @@ import { ToolRepetitionDetector } from "../tools/ToolRepetitionDetector"
 import { FileContextTracker } from "../context-tracking/FileContextTracker"
 import { RooIgnoreController } from "../ignore/RooIgnoreController"
 import { RooProtectedController } from "../protect/RooProtectedController"
-import { type AssistantMessageContent, presentAssistantMessage, parseAssistantMessage } from "../assistant-message"
+import { type AssistantMessageContent, presentAssistantMessage } from "../assistant-message"
 import { AssistantMessageParser } from "../assistant-message/AssistantMessageParser"
 import { truncateConversationIfNeeded } from "../sliding-window"
 import { ClineProvider } from "../webview/ClineProvider"
@@ -270,8 +270,7 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 	didRejectTool = false
 	didAlreadyUseTool = false
 	didCompleteReadingStream = false
-	assistantMessageParser?: AssistantMessageParser
-	isAssistantMessageParserEnabled = false
+	assistantMessageParser: AssistantMessageParser
 	private lastUsedInstructions?: string
 	private skipPrevResponseIdOnce: boolean = false
 
@@ -355,6 +354,9 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 			TelemetryService.instance.captureTaskCreated(this.taskId)
 		}
 
+		// Initialize the assistant message parser
+		this.assistantMessageParser = new AssistantMessageParser()
+
 		// Only set up diff strategy if diff is enabled.
 		if (this.diffEnabled) {
 			// Default to old strategy, will be updated if experiment is enabled.
@@ -1751,9 +1753,7 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 				this.didAlreadyUseTool = false
 				this.presentAssistantMessageLocked = false
 				this.presentAssistantMessageHasPendingUpdates = false
-				if (this.assistantMessageParser) {
-					this.assistantMessageParser.reset()
-				}
+				this.assistantMessageParser.reset()
 
 				await this.diffViewProvider.reset()
 
@@ -1794,12 +1794,7 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 
 								// Parse raw assistant message chunk into content blocks.
 								const prevLength = this.assistantMessageContent.length
-								if (this.isAssistantMessageParserEnabled && this.assistantMessageParser) {
-									this.assistantMessageContent = this.assistantMessageParser.processChunk(chunk.text)
-								} else {
-									// Use the old parsing method when experiment is disabled
-									this.assistantMessageContent = parseAssistantMessage(assistantMessage)
-								}
+								this.assistantMessageContent = this.assistantMessageParser.processChunk(chunk.text)
 
 								if (this.assistantMessageContent.length > prevLength) {
 									// New content we need to present, reset to
@@ -2058,11 +2053,8 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 				// this.assistantMessageContent.forEach((e) => (e.partial = false))
 
 				// Now that the stream is complete, finalize any remaining partial content blocks
-				if (this.isAssistantMessageParserEnabled && this.assistantMessageParser) {
-					this.assistantMessageParser.finalizeContentBlocks()
-					this.assistantMessageContent = this.assistantMessageParser.getContentBlocks()
-				}
-				// When using old parser, no finalization needed - parsing already happened during streaming
+				this.assistantMessageParser.finalizeContentBlocks()
+				this.assistantMessageContent = this.assistantMessageParser.getContentBlocks()
 
 				if (partialBlocks.length > 0) {
 					// If there is content to update then it will complete and
@@ -2081,9 +2073,7 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 				await this.providerRef.deref()?.postStateToWebview()
 
 				// Reset parser after each complete conversation round
-				if (this.assistantMessageParser) {
-					this.assistantMessageParser.reset()
-				}
+				this.assistantMessageParser.reset()
 
 				// Now add to apiConversationHistory.
 				// Need to save assistant responses to file before proceeding to

src/shared/__tests__/experiments.spec.ts

@@ -29,7 +29,6 @@ describe("experiments", () => {
 				powerSteering: false,
 				multiFileApplyDiff: false,
 				preventFocusDisruption: false,
-				assistantMessageParser: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.POWER_STEERING)).toBe(false)
 		})
@@ -39,7 +38,6 @@ describe("experiments", () => {
 				powerSteering: true,
 				multiFileApplyDiff: false,
 				preventFocusDisruption: false,
-				assistantMessageParser: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.POWER_STEERING)).toBe(true)
 		})
@@ -49,7 +47,6 @@ describe("experiments", () => {
 				powerSteering: false,
 				multiFileApplyDiff: false,
 				preventFocusDisruption: false,
-				assistantMessageParser: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.POWER_STEERING)).toBe(false)
 		})

src/shared/experiments.ts

@@ -4,7 +4,6 @@ export const EXPERIMENT_IDS = {
 	MULTI_FILE_APPLY_DIFF: "multiFileApplyDiff",
 	POWER_STEERING: "powerSteering",
 	PREVENT_FOCUS_DISRUPTION: "preventFocusDisruption",
-	ASSISTANT_MESSAGE_PARSER: "assistantMessageParser",
 } as const satisfies Record<string, ExperimentId>
 
 type _AssertExperimentIds = AssertEqual<Equals<ExperimentId, Values<typeof EXPERIMENT_IDS>>>
@@ -19,7 +18,6 @@ export const experimentConfigsMap: Record<ExperimentKey, ExperimentConfig> = {
 	MULTI_FILE_APPLY_DIFF: { enabled: false },
 	POWER_STEERING: { enabled: false },
 	PREVENT_FOCUS_DISRUPTION: { enabled: false },
-	ASSISTANT_MESSAGE_PARSER: { enabled: false },
 }
 
 export const experimentDefault = Object.fromEntries(

webview-ui/src/context/__tests__/ExtensionStateContext.spec.tsx

@@ -229,7 +229,6 @@ describe("mergeExtensionState", () => {
 				concurrentFileReads: true,
 				multiFileApplyDiff: true,
 				preventFocusDisruption: false,
-				assistantMessageParser: false,
 				newTaskRequireTodos: false,
 			} as Record<ExperimentId, boolean>,
 		}
@@ -248,7 +247,6 @@ describe("mergeExtensionState", () => {
 			concurrentFileReads: true,
 			multiFileApplyDiff: true,
 			preventFocusDisruption: false,
-			assistantMessageParser: false,
 			newTaskRequireTodos: false,
 		})
 	})