feat(telemetry): aggregate task completion telemetry with delta installments

packages/telemetry/src/TelemetryService.ts

@@ -5,6 +5,7 @@ import {
 	type TelemetryPropertiesProvider,
 	TelemetryEventName,
 	type TelemetrySetting,
+	type ToolUsage,
 } from "@roo-code/types"
 
 /**
@@ -86,8 +87,31 @@ export class TelemetryService {
 		this.captureEvent(TelemetryEventName.TASK_RESTARTED, { taskId })
 	}
 
-	public captureTaskCompleted(taskId: string): void {
-		this.captureEvent(TelemetryEventName.TASK_COMPLETED, { taskId })
+	/**
+	 * Captures task completion, summarizing per-task tool and message counts that
+	 * were previously reported as separate per-turn events to reduce event volume.
+	 *
+	 * A single task may emit this more than once (e.g. an "idle" or "shutdown"
+	 * installment followed by a final "attempt_completion" one). toolsUsed and
+	 * messageCount are always deltas since the previous emission for that task,
+	 * not running totals -- summing installments for a taskId reconstructs the
+	 * full-task counts without double-counting.
+	 *
+	 * Note: "attempt_completion" means the model called that tool, not that the
+	 * user accepted the result.
+	 */
+	public captureTaskCompleted(
+		taskId: string,
+		toolsUsed?: ToolUsage,
+		messageCount?: { user: number; assistant: number },
+		completionReason: "attempt_completion" | "idle" | "shutdown" = "attempt_completion",
+	): void {
+		this.captureEvent(TelemetryEventName.TASK_COMPLETED, {
+			taskId,
+			completionReason,
+			...(toolsUsed !== undefined && { toolsUsed }),
+			...(messageCount !== undefined && { messageCount }),
+		})
 	}
 
 	public captureConversationMessage(taskId: string, source: "user" | "assistant"): void {

packages/telemetry/src/__tests__/TelemetryService.task-completed.test.ts

@@ -0,0 +1,66 @@
+// pnpm --filter @roo-code/telemetry test src/__tests__/TelemetryService.task-completed.test.ts
+
+import { TelemetryEventName, type TelemetryClient } from "@roo-code/types"
+
+import { TelemetryService } from "../TelemetryService"
+
+describe("TelemetryService.captureTaskCompleted", () => {
+	let mockClient: TelemetryClient
+
+	beforeEach(() => {
+		mockClient = {
+			setProvider: vi.fn(),
+			capture: vi.fn().mockResolvedValue(undefined),
+			captureException: vi.fn().mockResolvedValue(undefined),
+			updateTelemetryState: vi.fn(),
+			isTelemetryEnabled: vi.fn().mockReturnValue(true),
+			shutdown: vi.fn().mockResolvedValue(undefined),
+		}
+	})
+
+	it("captures Task Completed with the taskId and a default 'attempt_completion' completionReason when no summary is provided", () => {
+		const service = new TelemetryService([mockClient])
+
+		service.captureTaskCompleted("task_1")
+
+		expect(mockClient.capture).toHaveBeenCalledWith({
+			event: TelemetryEventName.TASK_COMPLETED,
+			properties: { taskId: "task_1", completionReason: "attempt_completion" },
+		})
+	})
+
+	it("includes toolsUsed and messageCount summaries when provided", () => {
+		const service = new TelemetryService([mockClient])
+
+		service.captureTaskCompleted(
+			"task_1",
+			{ read_file: { attempts: 3, failures: 0 }, apply_diff: { attempts: 1, failures: 1 } },
+			{ user: 4, assistant: 5 },
+		)
+
+		expect(mockClient.capture).toHaveBeenCalledWith({
+			event: TelemetryEventName.TASK_COMPLETED,
+			properties: {
+				taskId: "task_1",
+				completionReason: "attempt_completion",
+				toolsUsed: { read_file: { attempts: 3, failures: 0 }, apply_diff: { attempts: 1, failures: 1 } },
+				messageCount: { user: 4, assistant: 5 },
+			},
+		})
+	})
+
+	it("includes the given completionReason for idle/shutdown installments", () => {
+		const service = new TelemetryService([mockClient])
+
+		service.captureTaskCompleted("task_1", { read_file: { attempts: 1, failures: 0 } }, undefined, "idle")
+
+		expect(mockClient.capture).toHaveBeenCalledWith({
+			event: TelemetryEventName.TASK_COMPLETED,
+			properties: {
+				taskId: "task_1",
+				completionReason: "idle",
+				toolsUsed: { read_file: { attempts: 1, failures: 0 } },
+			},
+		})
+	})
+})

src/__tests__/history-resume-delegation.spec.ts

@@ -1255,6 +1255,7 @@ describe("History resume delegation - parent metadata transitions", () => {
 				userMessageContent: [],
 				consecutiveMistakeCount: 0,
 				emitFinalTokenUsageUpdate: vi.fn(),
+				flushTelemetryInstallment: vi.fn(),
 			} as unknown as import("../core/task/Task").Task
 
 			const block = {

src/__tests__/nested-delegation-resume.spec.ts

@@ -203,6 +203,7 @@ describe("Nested delegation resume (A → B → C)", () => {
 			userMessageContent: [],
 			consecutiveMistakeCount: 0,
 			emitFinalTokenUsageUpdate: vi.fn(),
+			flushTelemetryInstallment: vi.fn(),
 		} as unknown as Task
 
 		const blockC = {
@@ -250,6 +251,7 @@ describe("Nested delegation resume (A → B → C)", () => {
 			userMessageContent: [],
 			consecutiveMistakeCount: 0,
 			emitFinalTokenUsageUpdate: vi.fn(),
+			flushTelemetryInstallment: vi.fn(),
 		} as unknown as Task
 
 		const blockB = {

src/core/task/Task.ts

@@ -135,6 +135,7 @@ import { MessageManager } from "../message-manager"
 import { validateAndFixToolResultIds } from "./validateToolResultIds"
 import { mergeConsecutiveApiMessages } from "./mergeConsecutiveApiMessages"
 import { prepareApiConversationMessage } from "./apiConversationHistory"
+import { shouldAddUserMessageToHistory } from "./messageCounting"
 
 const MAX_EXPONENTIAL_BACKOFF_SECONDS = 600 // 10 minutes
 const DEFAULT_USAGE_COLLECTION_TIMEOUT_MS = 5000 // 5 seconds
@@ -322,6 +323,25 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 	consecutiveNoAssistantMessagesCount: number = 0
 	toolUsage: ToolUsage = {}
 
+	// Conversation message counts, summarized once per Task Completed
+	// installment instead of emitting a separate telemetry event per turn.
+	messageCounts: { user: number; assistant: number } = { user: 0, assistant: 0 }
+
+	// Idle/shutdown telemetry flush: reports toolUsage/messageCounts for tasks that
+	// go quiet or get torn down without the model ever calling attempt_completion
+	// (or without the user accepting it), so long-running/abandoned tasks aren't
+	// invisible to telemetry. Each flush reports only what changed since the previous
+	// one, tracked via telemetryToolUsageBaseline/telemetryMessageCountsBaseline --
+	// task.toolUsage/messageCounts themselves are never mutated by this, since they're
+	// also read as running totals by the public TaskCompleted API event and the UI.
+	// Checked on an interval rather than hooked into every say()/ask() call site.
+	private static readonly IDLE_TELEMETRY_CHECK_INTERVAL_MS = 5 * 60 * 1000
+	private static readonly IDLE_TELEMETRY_THRESHOLD_MS = 30 * 60 * 1000
+	private idleTelemetryCheckInterval?: NodeJS.Timeout
+	private lastTelemetryFlushAt: number = Date.now()
+	private telemetryToolUsageBaseline: ToolUsage = {}
+	private telemetryMessageCountsBaseline: { user: number; assistant: number } = { user: 0, assistant: 0 }
+
 	// Checkpoints
 	enableCheckpoints: boolean
 	checkpointTimeout: number
@@ -601,6 +621,7 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 
 		if (startTask) {
 			this._started = true
+			this.startIdleTelemetryCheck()
 			if (task || images) {
 				void this.startTask(task, images).catch((error) => {
 					console.error("[Task#constructor] startTask failed:", error)
@@ -1878,6 +1899,7 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 			return
 		}
 		this._started = true
+		this.startIdleTelemetryCheck()
 
 		const { task, images } = this.metadata
 
@@ -2270,6 +2292,17 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 	public dispose(): void {
 		console.log(`[Task#dispose] disposing task ${this.taskId}.${this.instanceId}`)
 
+		// Stop the idle telemetry check and report any unflushed activity as a
+		// shutdown installment, so a task torn down mid-work (panel closed, task
+		// switched, extension deactivated) isn't invisible to telemetry.
+		try {
+			clearInterval(this.idleTelemetryCheckInterval)
+			this.idleTelemetryCheckInterval = undefined
+			this.flushTelemetryInstallment("shutdown")
+		} catch (error) {
+			console.error("Error flushing shutdown telemetry:", error)
+		}
+
 		// Cancel any in-progress HTTP request
 		try {
 			this.cancelCurrentRequest()
@@ -2629,18 +2662,16 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 			// Add environment details as its own text block, separate from tool
 			// results.
 			const finalUserContent = [...contentWithoutEnvDetails, { type: "text" as const, text: environmentDetails }]
-			// Only add user message to conversation history if:
-			// 1. This is the first attempt (retryAttempt === 0), AND
-			// 2. The original userContent was not empty (empty signals delegation resume where
-			//    the user message with tool_result and env details is already in history), OR
-			// 3. The message was removed in a previous iteration (userMessageWasRemoved === true)
-			// This prevents consecutive user messages while allowing re-add when needed
+			// See shouldAddUserMessageToHistory for the full add/skip rules (retry/empty/removed).
 			const isEmptyUserContent = currentUserContent.length === 0
-			const shouldAddUserMessage =
-				((currentItem.retryAttempt ?? 0) === 0 && !isEmptyUserContent) || currentItem.userMessageWasRemoved
+			const shouldAddUserMessage = shouldAddUserMessageToHistory({
+				retryAttempt: currentItem.retryAttempt,
+				isEmptyUserContent,
+				userMessageWasRemoved: currentItem.userMessageWasRemoved,
+			})
 			if (shouldAddUserMessage) {
 				await this.addToApiConversationHistory({ role: "user", content: finalUserContent })
-				TelemetryService.instance.captureConversationMessage(this.taskId, "user")
+				this.messageCounts.user++
 			}
 
 			// Since we sent off a placeholder api_req_started message to update the
@@ -3557,7 +3588,7 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 					)
 					this.assistantMessageSavedToHistory = true
 
-					TelemetryService.instance.captureConversationMessage(this.taskId, "assistant")
+					this.messageCounts.assistant++
 				}
 
 				// Present any partial blocks that were just completed.
@@ -3661,8 +3692,19 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 					if (this.apiConversationHistory.length > 0) {
 						const lastMessage = this.apiConversationHistory[this.apiConversationHistory.length - 1]
 						if (lastMessage.role === "user") {
-							// Remove the last user message that we added earlier
+							// Remove the last user message that we added earlier. Decrement
+							// messageCounts.user to match -- both retry branches below mark
+							// userMessageWasRemoved so the message (and its count) is restored
+							// exactly once when the retry succeeds, keeping the total symmetric
+							// regardless of how many empty-response cycles occur first.
+							// Guard: only reverse a count this iteration actually added. The
+							// popped message may predate this turn (resumed history, or a
+							// message appended by flushPendingToolResultsToHistory, neither
+							// of which incremented messageCounts.user).
 							this.apiConversationHistory.pop()
+							if (shouldAddUserMessage) {
+								this.messageCounts.user--
+							}
 						}
 					}
 
@@ -3706,32 +3748,45 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 						if (response === "yesButtonClicked") {
 							await this.say("api_req_retried")
 
-							// Push the same content back to retry
+							// Push the same content back to retry. Mark that user message was
+							// removed (same as the auto-retry path above) so it gets re-added --
+							// and messageCounts.user re-incremented -- on the retried attempt;
+							// otherwise shouldAddUserMessageToHistory sees retryAttempt > 0 with
+							// userMessageWasRemoved unset and skips re-adding it entirely.
 							stack.push({
 								userContent: currentUserContent,
 								includeFileDetails: false,
 								retryAttempt: (currentItem.retryAttempt ?? 0) + 1,
+								userMessageWasRemoved: true,
 							})
 
 							// Continue to retry the request
 							continue
 						} else {
 							// User declined to retry
-							// Re-add the user message we removed.
+							// Re-add the user message we removed (see messageCounts.user-- above)
+							// and increment messageCounts.user to match, same as the normal
+							// add-to-history path -- otherwise this abandoned-task path
+							// permanently undercounts by one.
 							await this.addToApiConversationHistory({
 								role: "user",
 								content: currentUserContent,
 							})
+							this.messageCounts.user++
 
 							await this.say(
 								"error",
 								"Unexpected API Response: The language model did not provide any assistant messages. This may indicate an issue with the API or the model's output.",
 							)
 
+							// Synthetic assistant message recording the failure -- increment
+							// messageCounts.assistant to match, same as the normal
+							// assistant-message-saved path.
 							await this.addToApiConversationHistory({
 								role: "assistant",
 								content: [{ type: "text", text: "Failure: I did not provide a response." }],
 							})
+							this.messageCounts.assistant++
 						}
 					}
 				}
@@ -4679,6 +4734,69 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 		}
 	}
 
+	/**
+	 * Emits a Task Completed installment for whatever toolUsage/messageCounts have
+	 * changed since the previous installment (from any reason), then advances the
+	 * telemetry baseline so a later installment reports only its own delta. Does
+	 * NOT touch task.toolUsage/messageCounts themselves -- those stay running totals
+	 * for the public TaskCompleted API event and the UI. No-ops if nothing changed
+	 * since the last installment, so idle/shutdown checks don't emit empty events
+	 * for tasks that were already fully reported (e.g. right after attempt_completion).
+	 */
+	public flushTelemetryInstallment(reason: "attempt_completion" | "idle" | "shutdown"): void {
+		const toolUsageDelta: ToolUsage = {}
+
+		for (const [toolName, usage] of Object.entries(this.toolUsage) as [ToolName, ToolUsage[ToolName]][]) {
+			if (!usage) {
+				continue
+			}
+
+			const baseline = this.telemetryToolUsageBaseline[toolName]
+			const attempts = usage.attempts - (baseline?.attempts ?? 0)
+			const failures = usage.failures - (baseline?.failures ?? 0)
+
+			if (attempts > 0 || failures > 0) {
+				toolUsageDelta[toolName] = { attempts, failures }
+			}
+		}
+
+		const messageCountDelta = {
+			user: Math.max(0, this.messageCounts.user - this.telemetryMessageCountsBaseline.user),
+			assistant: Math.max(0, this.messageCounts.assistant - this.telemetryMessageCountsBaseline.assistant),
+		}
+
+		const hasToolUsageDelta = Object.keys(toolUsageDelta).length > 0
+		const hasMessageDelta = messageCountDelta.user > 0 || messageCountDelta.assistant > 0
+
+		if (!hasToolUsageDelta && !hasMessageDelta) {
+			return
+		}
+
+		this.emitFinalTokenUsageUpdate()
+		TelemetryService.instance.captureTaskCompleted(this.taskId, toolUsageDelta, messageCountDelta, reason)
+
+		this.telemetryToolUsageBaseline = JSON.parse(JSON.stringify(this.toolUsage))
+		this.telemetryMessageCountsBaseline = { ...this.messageCounts }
+		this.lastTelemetryFlushAt = Date.now()
+	}
+
+	startIdleTelemetryCheck(): void {
+		this.idleTelemetryCheckInterval = setInterval(() => {
+			// Measure idleness from the later of the last activity and the last flush.
+			// Using lastMessageTs alone would keep the condition true forever after the
+			// first idle flush, re-running the empty-delta check on every interval tick.
+			const lastEventAt = Math.max(this.lastMessageTs ?? 0, this.lastTelemetryFlushAt)
+			const idleForMs = Date.now() - lastEventAt
+
+			if (idleForMs >= Task.IDLE_TELEMETRY_THRESHOLD_MS) {
+				this.flushTelemetryInstallment("idle")
+			}
+		}, Task.IDLE_TELEMETRY_CHECK_INTERVAL_MS)
+
+		// Don't hold the process open just for this timer.
+		this.idleTelemetryCheckInterval?.unref?.()
+	}
+
 	// Getters
 
 	public get taskStatus(): TaskStatus {