Update app.py

app.py

@@ -45,36 +45,21 @@ def navigate(screenshot, task: str, platform: str, history):
     """
 
     # ───────────────────── normalise history input ──────────────────────────
+    messages=None
     if history in (None, ""):
         history_list = []
     else:
         if isinstance(history, str):
             try:
-                history_list = ast.literal_eval(history)
+                messages= ast.literal_eval(history)
             except Exception as exc:
                 raise ValueError("`history` must be a JSON/Python list: " + str(exc))
         else:
-            history_list = history
+            messages = history
 
         if not isinstance(history_list, list):
             raise ValueError("`history` must be a list of messages.")
 
-    # ─────────────────── construct current user message ─────────────────────
-    prompt_header = (
-        "You are a GUI agent. You are given a task and your action history, "
-        "with screenshots. You need to perform the next action to complete "
-        "the task.\n\n## Output Format\n```\nThought: ...\nAction: ...\n```\n\n"
-        "## Action Space\nclick(start_box='...') / type(...)\n\n"
-        f"### Task\n{task}"
-    )
-
-    current_content = [
-        {"type": "text", "text": prompt_header},
-        {"type": "image_url", "image_url": screenshot},
-    ]
-
-    messages = history_list + [{"role": "user", "content": current_content}]
-
     # ─────────────────────────── model forward ─────────────────────────────
     text = processor.apply_chat_template(
         messages, tokenize=False, add_generation_prompt=True
@@ -128,7 +113,7 @@ demo = gr.Interface(
         gr.Image(label="With Click Point"),
         gr.Textbox(label="Raw Action JSON"),
     ],
-    title="ShowUI‑2B Navigation Demo",
+    title="UI-Tars Navigation Demo",
 )
 
 demo.launch(