cli/btw: tell the model side questions are unsaved and tool-scoped

src/plyngent/agent/chat.py

@@ -603,19 +603,24 @@ class ChatAgent:
         tools: ToolRegistry | bool | None = False,
         max_rounds: int | None = None,
         system_prompt: str | None = None,
+        notice: Notice | None = None,
         instance_state: object | None = None,
         session_state: object | None = None,
     ) -> AsyncIterator[AgentEvent]:
         """Run a side turn that does not mutate this agent or its memory.
 
         - Message list is forked (optional history copy); never written back.
-        - ``memory`` / ``session_id`` are unset on the side agent (no DB).
+        - ``memory`` / ``session_id`` are unset on the side agent (no DB), so a
+          *notice* stays local to this exchange.
         - ``todo_stack`` is unset (no nags / main stack thrash).
         - Tools default **off**. ``tools=True`` clones this agent's registry with
           a **fresh session** bag (unless *session_state* is passed) and the
           given *instance_state* (CLI typically shares the host instance for
           workspace identity). A caller-built :class:`ToolRegistry` (e.g. a
           ``clone(read_only_only=True)`` subset) is used as-is.
+        - *notice* is appended after the forked history, i.e. right before the
+          side question, so the model knows this exchange's rules (unsaved,
+          read-only tools, …).
         """
         text = user_text.strip()
         if not text:
@@ -640,6 +645,8 @@ class ChatAgent:
             session_state=aside_session,
         )
         history = list(self.messages) if include_history else []
+        if notice is not None:
+            history.append(notice.to_message())
         rounds = self.max_rounds if max_rounds is None else max_rounds
         if aside_tools is None and max_rounds is None:
             rounds = 1

src/plyngent/cli/slash.py

@@ -980,10 +980,13 @@ def btw_cmd(
             return
         tools_mode = "no"
 
-    from plyngent.cli.display import render_events
+    from plyngent.agent import aside_notice
+    from plyngent.cli.display import echo_notice, render_events
     from plyngent.cli.retry import run_cancellable
     from plyngent.tools.context import SessionState, read_only_context
 
+    aside = aside_notice(tools_mode=tools_mode)
+    echo_notice(aside)
     click.secho("btw: ", fg="magenta", nl=False)
     click.echo(text)
     if tools_mode == "no":
@@ -1008,6 +1011,7 @@ def btw_cmd(
                 text,
                 include_history=not fresh,
                 tools=tools_arg,
+                notice=aside,
                 instance_state=aside_instance,
                 session_state=aside_session,
             )