make a single agent

app/agents/note_agent.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import re
 from typing import Any
 
 from langchain_core.tools import tool
@@ -9,6 +10,14 @@ from langchain_core.tools import tool
 from app.core.llm import embed
 from app.core.ws_context import execute_on_client
 
+_UUID_RE = re.compile(
+    r"^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-5][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$"
+)
+
+
+def _is_uuid(value: str) -> bool:
+    return bool(_UUID_RE.match(value))
+
 NOTE_SYSTEM_PROMPT = (
     "You are a note-taking assistant. You help users create, retrieve, update,\n"
     "and delete Markdown notes in their workspace.\n\n"
@@ -19,6 +28,7 @@ NOTE_SYSTEM_PROMPT = (
     "    before appending or replacing sections\n"
     "  - list_notes without project_id returns all notes; scope with project_id\n"
     "    when the user is working within a specific project\n"
+    "  - project_id must be a UUID; if you only know a project name, do not pass it as project_id\n"
     "  - Do not fabricate note content — reflect what the user provides or what\n"
     "    is already in the note (retrieved via get_note)."
 )
@@ -27,10 +37,11 @@ NOTE_SYSTEM_PROMPT = (
 @tool
 async def list_notes(project_id: str = "") -> str:
     """List notes, optionally scoped to a project by project_id."""
+    normalized_project_id = project_id if (project_id and _is_uuid(project_id)) else ""
     result = await execute_on_client(
         action="select",
         table="notes",
-        filters={"projectId": project_id or None},
+        filters={"projectId": normalized_project_id or None},
     )
     rows = result.get("rows", [])
     if not rows: