Method handleContextWindowExceededError

src/core/task/Task.ts:3803–3935

()

	}

	private async handleContextWindowExceededError(): Promise<void> {
		const state = await this.providerRef.deref()?.getState()
		const { profileThresholds = {}, mode, apiConfiguration } = state ?? {}

		const { contextTokens } = this.getTokenUsage()
		const modelInfo = this.api.getModel().info

		const maxTokens = getModelMaxOutputTokens({
			modelId: this.api.getModel().id,
			model: modelInfo,
			settings: this.apiConfiguration,
		})

		// vscode-lm condenses against its static-table maxInputTokens (not the inflated live window);
		// only it implements getCondenseContextWindow, so others fall back to the full contextWindow.
		const contextWindow = this.api.getCondenseContextWindow?.() ?? modelInfo.contextWindow
		const useAvailableInputForContextPercent = typeof this.api.getCondenseContextWindow === "function"

		// Get the current profile ID using the helper method
		const currentProfileId = this.getCurrentProfileId(state)

		// Log the context window error for debugging
		console.warn(
			`[Task#${this.taskId}] Context window exceeded for model ${this.api.getModel().id}. ` +
				`Current tokens: ${contextTokens}, Context window: ${contextWindow}. ` +
				`Forcing truncation to ${FORCED_CONTEXT_REDUCTION_PERCENT}% of current context.`,
		)
		// Send condenseTaskContextStarted to show in-progress indicator
		await this.providerRef.deref()?.postMessageToWebview({ type: "condenseTaskContextStarted", text: this.taskId })

		// Build tools for condensing metadata (same tools used for normal API calls)
		const provider = this.providerRef.deref()
		let allTools: import("openai").default.Chat.ChatCompletionTool[] = []
		if (provider) {
			const toolsResult = await buildNativeToolsArrayWithRestrictions({
				provider,
				cwd: this.cwd,
				mode,
				customModes: state?.customModes,
				experiments: state?.experiments,
				apiConfiguration,
				disabledTools: state?.disabledTools,
				modelInfo,
				includeAllToolsWithRestrictions: false,
			})
			allTools = toolsResult.tools
		}

		// Build metadata with tools and taskId for the condensing API call
		const metadata: ApiHandlerCreateMessageMetadata = {
			mode,
			taskId: this.taskId,
			...(this.currentRequestAbortController?.signal
				? {
						abortSignal: this.currentRequestAbortController.signal,
					}
				: {}),
			...(allTools.length > 0