diff --git a/src/agent/context.rs b/src/agent/context.rs
index 68ebc63..17ebba0 100644
--- a/src/agent/context.rs
+++ b/src/agent/context.rs
@@ -449,7 +449,9 @@ fn parse_xml_tool_call(body: &str) -> Option<(String, String)> {
     let mut args = serde_json::Map::new();
     let mut rest = func_body;
     while let Some((key, val, remainder)) = parse_qwen_tag(rest, "parameter") {
-        args.insert(key.to_string(), serde_json::Value::String(val.to_string()));
+        let value = serde_json::from_str(val)
+            .unwrap_or(serde_json::Value::String(val.to_string()));
+        args.insert(key.to_string(), value);
         rest = remainder;
     }
     Some((func_name.to_string(), serde_json::to_string(&args).unwrap_or_default()))