From af88310f313da36a3fb0a02844460a3eb32d9657 Mon Sep 17 00:00:00 2001
From: lawrence3699 <lawrence3699@users.noreply.github.com>
Date: Fri, 17 Apr 2026 14:47:11 +1000
Subject: [PATCH] fix(agents): error on failed tts tool synthesis

---
 src/agents/tools/tts-tool.test.ts | 13 +++++++++++++
 src/agents/tools/tts-tool.ts      | 10 +---------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/src/agents/tools/tts-tool.test.ts b/src/agents/tools/tts-tool.test.ts
index f559166d7bb..7faa0790950 100644
--- a/src/agents/tools/tts-tool.test.ts
+++ b/src/agents/tools/tts-tool.test.ts
@@ -41,4 +41,17 @@ describe("createTtsTool", () => {
     });
     expect(JSON.stringify(result.content)).not.toContain("MEDIA:");
   });
+
+  it("throws when synthesis fails so the agent records a tool error", async () => {
+    textToSpeechSpy.mockResolvedValue({
+      success: false,
+      error: "TTS conversion failed: openai: not configured",
+    });
+
+    const tool = createTtsTool();
+
+    await expect(tool.execute("call-1", { text: "hello" })).rejects.toThrow(
+      "TTS conversion failed: openai: not configured",
+    );
+  });
 });
diff --git a/src/agents/tools/tts-tool.ts b/src/agents/tools/tts-tool.ts
index 38ac7b4e65f..ba37c73e0c4 100644
--- a/src/agents/tools/tts-tool.ts
+++ b/src/agents/tools/tts-tool.ts
@@ -49,15 +49,7 @@ export function createTtsTool(opts?: {
         };
       }
 
-      return {
-        content: [
-          {
-            type: "text",
-            text: result.error ?? "TTS conversion failed",
-          },
-        ],
-        details: { error: result.error },
-      };
+      throw new Error(result.error ?? "TTS conversion failed");
     },
   };
 }