Add some comments

Signed-off-by: gaobinlong <[email protected]>

public/components/agent_framework_traces.tsx

@@ -64,6 +64,7 @@ ${result}
         <h3>Response</h3>
       </EuiText>
       {traces
+        // if origin exists, it indicates that the trace was generated by a tool, we only show the non-empty traces of tools
         .filter((trace) => trace.origin && (trace.input || trace.output))
         .map((trace, i) => {
           const stepContent = `Step ${i + 1}`;