fix(comfy): wrap malformed workflow json

CHANGELOG.md

@@ -78,6 +78,7 @@ Docs: https://docs.openclaw.ai
 - Telnyx voice-call: use the raw `client_state` fallback when webhook state is malformed base64 instead of using silently corrupted decoded text.
 - Google Meet: report malformed node-host params JSON with plugin-owned errors instead of leaking raw JSON parser failures.
 - CLI/export-trajectory: report malformed encoded request JSON with a stable CLI error instead of leaking raw parser output.
+- ComfyUI: report malformed workflow API JSON responses with owned errors instead of leaking raw parser failures.
 - Twilio voice-call: report malformed successful API JSON responses with provider-owned errors instead of leaking raw parser failures.
 - Voice-call provider APIs: report malformed successful guarded JSON responses with provider-prefixed errors instead of leaking raw parser failures.
 - Realtime transcription: report malformed provider websocket JSON frames with owned parser errors instead of leaking raw `SyntaxError` objects.

extensions/comfy/image-generation-provider.test.ts

@@ -201,6 +201,36 @@ describe("comfy image-generation provider", () => {
     });
   });
 
+  it("reports malformed local workflow submit JSON as a provider error", async () => {
+    _setComfyFetchGuardForTesting(fetchWithSsrFGuardMock);
+    const release = vi.fn(async () => {});
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({
+      response: new Response("{ nope", {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release,
+    });
+
+    const provider = buildComfyImageGenerationProvider();
+    await expect(
+      provider.generateImage({
+        provider: "comfy",
+        model: "workflow",
+        prompt: "draw a lobster",
+        cfg: buildComfyConfig({
+          workflow: {
+            "6": { inputs: { text: "" } },
+            "9": { inputs: {} },
+          },
+          promptNodeId: "6",
+          outputNodeId: "9",
+        }),
+      }),
+    ).rejects.toThrow("Comfy workflow submit failed: malformed JSON response");
+    expect(release).toHaveBeenCalledTimes(1);
+  });
+
   it("uploads reference images for local edit workflows", async () => {
     _setComfyFetchGuardForTesting(fetchWithSsrFGuardMock);
     fetchWithSsrFGuardMock

extensions/comfy/workflow-runtime.ts

@@ -299,7 +299,11 @@ async function readJsonResponse<T>(params: {
   });
   try {
     await assertOkOrThrowHttpError(response, params.errorPrefix);
-    return (await response.json()) as T;
+    try {
+      return (await response.json()) as T;
+    } catch (cause) {
+      throw new Error(`${params.errorPrefix}: malformed JSON response`, { cause });
+    }
   } finally {
     await release();
   }