feat(tools): save large task outputs to file to prevent truncation

src/shared/task-output.ts

@@ -0,0 +1,41 @@
+import { existsSync, mkdirSync, writeFileSync } from "node:fs";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import { log } from "./logger";
+
+export const INLINE_OUTPUT_MAX_CHARS = 15000;
+
+export function getTaskOutputsDir(): string {
+	const dir = join(tmpdir(), "opencode-task-outputs");
+	if (!existsSync(dir)) {
+		try {
+			mkdirSync(dir, { recursive: true });
+		} catch (error) {
+			log(`[task-output] Failed to create output directory: ${error}`);
+		}
+	}
+	return dir;
+}
+
+export function saveOutputToFile(
+	toolName: string,
+	id: string,
+	content: string,
+): string | null {
+	try {
+		const outputDir = getTaskOutputsDir();
+		const timestamp = new Date().toISOString().replace(/[:.]/g, "-");
+		const filename = `${toolName}_${id}_${timestamp}.md`;
+		const filePath = join(outputDir, filename);
+		writeFileSync(filePath, content, "utf-8");
+		return filePath;
+	} catch (error) {
+		log(`[task-output] Failed to save output to file: ${error}`);
+		return null;
+	}
+}
+
+export function truncateText(text: string, maxLength: number): string {
+	if (text.length <= maxLength) return text;
+	return text.slice(0, maxLength) + "...";
+}