earendil-works/pi · error · Error

Cannot submit a prompt while compaction is in progress. Wait

Error message

Cannot submit a prompt while compaction is in progress. Wait for compaction to finish and retry.

What it means

Error "Cannot submit a prompt while compaction is in progress. Wait for compaction to finish and retry." thrown in earendil-works/pi.

Source

Thrown at packages/coding-agent/src/core/agent-session.ts:1145

	async prompt(text: string, options?: PromptOptions): Promise<void> {
		const expandPromptTemplates = options?.expandPromptTemplates ?? true;
		const preflightResult = options?.preflightResult;
		let messages: AgentMessage[] | undefined;

		try {
			// Handle extension commands first (execute immediately, even during streaming)
			// Extension commands manage their own LLM interaction via pi.sendMessage()
			if (expandPromptTemplates && text.startsWith("/")) {
				const handled = await this._tryExecuteExtensionCommand(text);
				if (handled) {
					// Extension command executed, no prompt to send
					preflightResult?.(true);
					return;
				}
			}

			if (this._compactionAbortController !== undefined) {
				throw new Error(
					"Cannot submit a prompt while compaction is in progress. Wait for compaction to finish and retry.",
				);
			}

			// Emit input event for extension interception (before skill/template expansion)
			let currentText = text;
			let currentImages = options?.images;
			if (this._extensionRunner.hasHandlers("input")) {
				const inputResult = await this._extensionRunner.emitInput(
					currentText,
					currentImages,
					options?.source ?? "interactive",
					this.isStreaming ? options?.streamingBehavior : undefined,
				);
				if (inputResult.action === "handled") {
					preflightResult?.(true);
					return;
				}

View on GitHub (pinned to 4af9d21d3b)

When it happens

Trigger: Thrown at packages/coding-agent/src/core/agent-session.ts:1145 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of earendil-works/pi@4af9d21d3b (2026-08-24). Data as JSON: /api/errors/401964107aea9020. Report an issue: GitHub.