Tool calls in chat

app/src/main/java/ai/javaclaw/chat/ChatChannel.java

@@ -1,7 +1,7 @@
 package ai.javaclaw.chat;
 
 import ai.javaclaw.agent.Agent;
-import ai.javaclaw.agent.ResponseListener;
+import ai.javaclaw.agent.AgentEvent;
 import ai.javaclaw.channels.Channel;
 import ai.javaclaw.channels.ChannelMessageReceivedEvent;
 import ai.javaclaw.channels.ChannelRegistry;
@@ -143,27 +143,29 @@ public List<String> loadHistoryAsHtml(String conversationId) {
     /**
      * Handles a chat message from the web UI for the given conversationId.
      * The response is streamed to the WebSocket session as JSON frames
-     * ({@code chunk}/{@code done}/{@code error}); the full response text is returned.
+     * ({@code chunk}/{@code toolCall}/{@code toolResult}/{@code done}/{@code error}).
      */
-    public String chat(String conversationId, String message) {
+    public void chat(String conversationId, String message) {
         channelRegistry.publishMessageReceivedEvent(new ChannelMessageReceivedEvent(getName(), message));
 
-        return agent.respondTo(conversationId, message, ResponseListener.of(
-                token -> sendChunkFrame(conversationId, token),
-                () -> sendDoneFrame(conversationId),
-                error -> sendErrorFrame(conversationId, error)));
-    }
-
-    private void sendChunkFrame(String conversationId, String token) {
-        sendFrame(frame(StreamFrameType.CHUNK, conversationId, token));
-    }
-
-    private void sendDoneFrame(String conversationId) {
-        sendFrame(frame(StreamFrameType.DONE, conversationId, null));
-    }
-
-    private void sendErrorFrame(String conversationId, String error) {
-        sendFrame(frame(StreamFrameType.ERROR, conversationId, error == null ? "Unknown error" : error));
+        agent.respondTo(conversationId, message, event -> sendFrame(switch (event) {
+            case AgentEvent.Token t -> frame(StreamFrameType.CHUNK, conversationId, t.text());
+            case AgentEvent.ToolCall c -> frame(StreamFrameType.TOOL_CALL, conversationId,
+                    toolData(c.id(), c.name(), "input", c.input()));
+            case AgentEvent.ToolResult r -> frame(StreamFrameType.TOOL_RESULT, conversationId,
+                    toolData(r.id(), r.name(), "output", r.output()));
+            case AgentEvent.Done ignored -> frame(StreamFrameType.DONE, conversationId, null);
+            case AgentEvent.Failed f -> frame(StreamFrameType.ERROR, conversationId,
+                    f.message() == null ? "Unknown error" : f.message());
+        }));
+    }
+
+    private static Map<String, Object> toolData(String id, String name, String payloadKey, String payload) {
+        Map<String, Object> data = new LinkedHashMap<>();
+        data.put("id", id);
+        data.put("name", name);
+        data.put(payloadKey, payload == null ? "" : payload);
+        return data;
     }
 
     private static Map<String, Object> frame(StreamFrameType type, String conversationId, Object payload) {

app/src/main/java/ai/javaclaw/chat/StreamFrameType.java

@@ -6,6 +6,8 @@
  */
 public enum StreamFrameType {
     CHUNK("chunk"),
+    TOOL_CALL("toolCall"),
+    TOOL_RESULT("toolResult"),
     DONE("done"),
     ERROR("error");