refactor(loop): remove interim text retry, use system prompt constraint instead

nanobot/agent/context.py

@@ -106,6 +106,7 @@ Only use the 'message' tool when you need to send a message to a specific chat c
 For normal conversation, just respond with text - do not call the message tool.
 
 Always be helpful, accurate, and concise. Before calling tools, briefly tell the user what you're about to do (one short sentence in the user's language).
+If you need to use tools, call them directly — never send a preliminary message like "Let me check" without actually calling a tool.
 When remembering something important, write to {workspace_path}/memory/MEMORY.md
 To recall past events, grep {workspace_path}/memory/HISTORY.md"""
     

nanobot/agent/loop.py

@@ -202,8 +202,6 @@ class AgentLoop:
         iteration = 0
         final_content = None
         tools_used: list[str] = []
-        text_only_retried = False
-        interim_content: str | None = None  # Fallback if retry produces nothing
 
         while iteration < self.max_iterations:
             iteration += 1
@@ -249,19 +247,6 @@ class AgentLoop:
                     )
             else:
                 final_content = self._strip_think(response.content)
-                # Some models send an interim text response before tool calls.
-                # Give them one retry; save the content as fallback in case
-                # the retry produces nothing useful (e.g. model already answered).
-                if not tools_used and not text_only_retried and final_content:
-                    text_only_retried = True
-                    interim_content = final_content
-                    logger.debug("Interim text response (no tools used yet), retrying: {}", final_content[:80])
-                    final_content = None
-                    continue
-                # Fall back to interim content if retry produced nothing
-                # and no tools were used (if tools ran, interim was truly interim)
-                if not final_content and interim_content and not tools_used:
-                    final_content = interim_content
                 break
 
         return final_content, tools_used