diff --git a/src/auto-reply/commands-args.ts b/src/auto-reply/commands-args.ts
index 63f73c468..7122d5457 100644
--- a/src/auto-reply/commands-args.ts
+++ b/src/auto-reply/commands-args.ts
@@ -4,14 +4,20 @@ export type CommandArgsFormatter = (values: CommandArgValues) => string | undefi
 
 function normalizeArgValue(value: unknown): string | undefined {
   if (value == null) return undefined;
+  let text: string;
   if (typeof value === "string") {
-    const trimmed = value.trim();
-    return trimmed ? trimmed : undefined;
+    text = value.trim();
+  } else if (typeof value === "number" || typeof value === "boolean" || typeof value === "bigint") {
+    text = String(value).trim();
+  } else if (typeof value === "symbol") {
+    text = value.toString().trim();
+  } else if (typeof value === "function") {
+    text = value.toString().trim();
+  } else {
+    // Objects and arrays
+    text = JSON.stringify(value);
   }
-  if (typeof value === "number" || typeof value === "boolean" || typeof value === "bigint") {
-    return String(value);
-  }
-  return undefined;
+  return text ? text : undefined;
 }
 
 const formatConfigArgs: CommandArgsFormatter = (values) => {
diff --git a/src/auto-reply/commands-registry.ts b/src/auto-reply/commands-registry.ts
index 5edc677d2..4da2f9869 100644
--- a/src/auto-reply/commands-registry.ts
+++ b/src/auto-reply/commands-registry.ts
@@ -137,13 +137,25 @@ function formatPositionalArgs(
   for (const definition of definitions) {
     const value = values[definition.name];
     if (value == null) continue;
+    let rendered: string;
     if (typeof value === "string") {
-      const trimmed = value.trim();
-      if (!trimmed) continue;
-      parts.push(trimmed);
-    } else if (typeof value === "number" || typeof value === "boolean" || typeof value === "bigint") {
-      parts.push(String(value));
+      rendered = value.trim();
+    } else if (
+      typeof value === "number" ||
+      typeof value === "boolean" ||
+      typeof value === "bigint"
+    ) {
+      rendered = String(value);
+    } else if (typeof value === "symbol") {
+      rendered = value.toString();
+    } else if (typeof value === "function") {
+      rendered = value.toString();
+    } else {
+      // Objects and arrays
+      rendered = JSON.stringify(value);
     }
+    if (!rendered) continue;
+    parts.push(rendered);
     if (definition.captureRemaining) break;
   }
   return parts.length > 0 ? parts.join(" ") : undefined;
diff --git a/src/auto-reply/templating.ts b/src/auto-reply/templating.ts
index e110e5a9b..647088460 100644
--- a/src/auto-reply/templating.ts
+++ b/src/auto-reply/templating.ts
@@ -84,6 +84,9 @@ function formatTemplateValue(value: unknown): string {
   if (typeof value === "number" || typeof value === "boolean" || typeof value === "bigint") {
     return String(value);
   }
+  if (typeof value === "symbol" || typeof value === "function") {
+    return value.toString();
+  }
   if (Array.isArray(value)) {
     return value
       .flatMap((entry) => {
@@ -96,6 +99,9 @@ function formatTemplateValue(value: unknown): string {
       })
       .join(",");
   }
+  if (typeof value === "object") {
+    return JSON.stringify(value);
+  }
   return "";
 }