diff --git a/packages/coding-agent/test/tiny-models-cli.test.ts b/packages/coding-agent/test/tiny-models-cli.test.ts
index 363d1eeba..f3acdd520 100644
--- a/packages/coding-agent/test/tiny-models-cli.test.ts
+++ b/packages/coding-agent/test/tiny-models-cli.test.ts
@@ -50,4 +50,29 @@ describe("tiny-models download model resolution", () => {
 			results: [{ model: "lfm2-700m", ok: false, error: "Error: runtime install failed\n    at worker" }],
 		});
 	});
+
+	it("includes worker error details in text failures", async () => {
+		const output: string[] = [];
+		const isTtyDescriptor = Object.getOwnPropertyDescriptor(process.stdout, "isTTY");
+		Object.defineProperty(process.stdout, "isTTY", { configurable: true, value: false });
+		spyOn(process.stdout, "write").mockImplementation((chunk: string | Uint8Array) => {
+			output.push(typeof chunk === "string" ? chunk : new TextDecoder().decode(chunk));
+			return true;
+		});
+		spyOn(tinyTitleClient, "downloadModel").mockResolvedValue({
+			ok: false,
+			error: "Error: runtime install failed\n    at worker",
+		});
+
+		try {
+			await expect(
+				runTinyModelsCommand({ action: "download", model: "lfm2-700m", flags: {} }),
+			).rejects.toThrow("One or more tiny title models failed to download");
+		} finally {
+			if (isTtyDescriptor) Object.defineProperty(process.stdout, "isTTY", isTtyDescriptor);
+			else delete (process.stdout as typeof process.stdout & { isTTY?: boolean }).isTTY;
+		}
+
+		expect(output.join("")).toContain("Failed to download LFM2 700M: runtime install failed.");
+	});
 });