diff --git a/src/agents/tools/nodes-tool.ts b/src/agents/tools/nodes-tool.ts
index 1528726b8..699122c82 100644
--- a/src/agents/tools/nodes-tool.ts
+++ b/src/agents/tools/nodes-tool.ts
@@ -454,7 +454,9 @@ export function createNodesTool(options?: {
                 invokeParams = JSON.parse(invokeParamsJson);
               } catch (err) {
                 const message = err instanceof Error ? err.message : String(err);
-                throw new Error(`invokeParamsJson must be valid JSON: ${message}`);
+                throw new Error(`invokeParamsJson must be valid JSON: ${message}`, {
+                  cause: err,
+                });
               }
             }
             const invokeTimeoutMs = parseTimeoutMs(params.invokeTimeoutMs);
diff --git a/src/auto-reply/reply/commands-ptt.ts b/src/auto-reply/reply/commands-ptt.ts
index 037c3043f..f104b3f17 100644
--- a/src/auto-reply/reply/commands-ptt.ts
+++ b/src/auto-reply/reply/commands-ptt.ts
@@ -187,10 +187,7 @@ export const handlePTTCommand: CommandHandler = async (params, allowTextCommands
       params: invokeParams,
       config: cfg,
     });
-    const payload =
-      res.payload && typeof res.payload === "object"
-        ? (res.payload as Record<string, unknown>)
-        : {};
+    const payload = res.payload && typeof res.payload === "object" ? res.payload : {};
 
     const lines = [`PTT ${actionKey} → ${nodeId}`];
     if (typeof payload.status === "string") {