diff --git a/python/functions/notebook/README.md b/python/functions/notebook/README.txt
similarity index 100%
rename from python/functions/notebook/README.md
rename to python/functions/notebook/README.txt
diff --git a/python/functions/notebook/jupyter_exec.md b/python/functions/notebook/jupyter_exec.md
index f6637544..f2b89ca6 100644
--- a/python/functions/notebook/jupyter_exec.md
+++ b/python/functions/notebook/jupyter_exec.md
@@ -102,4 +102,6 @@ Output siempre JSON. En error retorna `{"error": "..."}` por stderr con exit cod
 - `jupyter_kernel_execute` es sincrona directamente porque `KernelClient.execute` es bloqueante.
 - El token puede ser cadena vacia si el servidor tiene autenticacion deshabilitada.
 - `NbModelClient` requiere que el servidor tenga habilitado el endpoint colaborativo (`/api/collaboration/`), disponible en JupyterLab >= 4 con `jupyter-collaboration` instalado.
+- **Auto-init**: `jupyter_append_execute` crea el notebook automaticamente si no existe (via REST PUT /api/contents) y arranca una sesion con kernel si no hay ninguna activa para ese notebook (via POST /api/sessions). No es necesario abrir el notebook manualmente en el navegador.
+- **Auto-session**: `jupyter_execute_cell` tambien garantiza que exista una sesion con kernel antes de ejecutar.
 - **Fix Issue 006**: `jupyter_execute_cell` normaliza la celda antes de ejecutar. Las celdas creadas manualmente (no via la UI de Jupyter) pueden carecer de `outputs` o `execution_count` en el modelo CRDT, lo que causaba `KeyError: 'outputs'` dentro de `execute_cell` al hacer `del ycell["outputs"][:]`. El fix lee la celda con `nb[cell_index]`, detecta los campos faltantes, y reemplaza la celda via `nb[cell_index] = _normalize_code_cell(cell)` — que usa `set_cell` internamente para re-crear el mapa CRDT completo preservando el source original.
diff --git a/python/functions/notebook/jupyter_exec.py b/python/functions/notebook/jupyter_exec.py
index fa14f5e6..01fb7e13 100644
--- a/python/functions/notebook/jupyter_exec.py
+++ b/python/functions/notebook/jupyter_exec.py
@@ -10,7 +10,7 @@ import asyncio
 import json
 from functools import partial
 from typing import Any
-from urllib.error import URLError
+from urllib.error import HTTPError, URLError
 from urllib.request import Request, urlopen
 
 from jupyter_kernel_client import KernelClient
@@ -23,6 +23,80 @@ from nbformat import NotebookNode
 # ---------------------------------------------------------------------------
 
 
+def _notebook_exists(notebook_path: str, server_url: str, token: str) -> bool:
+    """Comprueba si un notebook existe en el servidor Jupyter via HEAD /api/contents."""
+    headers = {"Accept": "application/json"}
+    if token:
+        headers["Authorization"] = f"token {token}"
+    check_url = f"{server_url}/api/contents/{notebook_path}"
+    req = Request(check_url, headers=headers, method="HEAD")
+    try:
+        with urlopen(req, timeout=5):
+            return True
+    except HTTPError as e:
+        if e.code == 404:
+            return False
+        raise
+
+
+def _create_notebook(notebook_path: str, server_url: str, token: str, kernel_name: str = "python3") -> None:
+    """Crea un notebook vacio via PUT /api/contents si no existe."""
+    if _notebook_exists(notebook_path, server_url, token):
+        return
+    headers = {
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    if token:
+        headers["Authorization"] = f"token {token}"
+    kernel_display = {"python3": "Python 3 (ipykernel)", "python": "Python 3"}.get(kernel_name, kernel_name)
+    notebook_content = {
+        "nbformat": 4,
+        "nbformat_minor": 5,
+        "metadata": {
+            "kernelspec": {"name": kernel_name, "display_name": kernel_display, "language": "python"},
+            "language_info": {"name": "python"},
+        },
+        "cells": [],
+    }
+    body = json.dumps({"type": "notebook", "content": notebook_content}).encode("utf-8")
+    url = f"{server_url}/api/contents/{notebook_path}"
+    req = Request(url, data=body, headers=headers, method="PUT")
+    with urlopen(req, timeout=10) as resp:
+        resp.read()
+
+
+def _ensure_session(server_url: str, token: str, notebook_path: str, kernel_name: str = "python3") -> str:
+    """Garantiza que exista una sesion para el notebook. Retorna el kernel_id.
+
+    Si ya hay una sesion activa, retorna su kernel_id. Si no, crea una nueva
+    via POST /api/sessions (lo cual tambien arranca un kernel).
+    """
+    kernel_id = _resolve_kernel_id(server_url, token, notebook_path)
+    if kernel_id:
+        return kernel_id
+
+    headers = {
+        "Accept": "application/json",
+        "Content-Type": "application/json",
+    }
+    if token:
+        headers["Authorization"] = f"token {token}"
+
+    body = json.dumps({
+        "path": notebook_path,
+        "type": "notebook",
+        "kernel": {"name": kernel_name},
+    }).encode("utf-8")
+
+    url = f"{server_url}/api/sessions"
+    req = Request(url, data=body, headers=headers, method="POST")
+    with urlopen(req, timeout=10) as resp:
+        session = json.loads(resp.read())
+
+    return session.get("kernel", {}).get("id", "")
+
+
 def _api_get(url: str, token: str = "") -> dict | list | None:
     """GET a Jupyter REST API endpoint."""
     headers = {"Accept": "application/json"}
@@ -112,13 +186,14 @@ async def _async_append_execute(
     server_url: str,
     token: str,
 ) -> dict[str, Any]:
+    _create_notebook(notebook_path, server_url, token)
+    kernel_id = _ensure_session(server_url, token, notebook_path)
+
     ws_url = get_jupyter_notebook_websocket_url(
         server_url,
         notebook_path,
         token or None,
     )
-
-    kernel_id = _resolve_kernel_id(server_url, token, notebook_path)
     username = _resolve_collab_username(server_url, token)
 
     async with NbModelClient(ws_url, username=username) as nb:
@@ -149,12 +224,13 @@ async def _async_execute_cell(
     server_url: str,
     token: str,
 ) -> dict[str, Any]:
+    kernel_id = _ensure_session(server_url, token, notebook_path)
+
     ws_url = get_jupyter_notebook_websocket_url(
         server_url,
         notebook_path,
         token or None,
     )
-    kernel_id = _resolve_kernel_id(server_url, token, notebook_path)
     username = _resolve_collab_username(server_url, token)
 
     async with NbModelClient(ws_url, username=username) as nb:
diff --git a/python/functions/notebook/jupyter_kernel.md b/python/functions/notebook/jupyter_kernel.md
index 8c53b1b6..c529ec0b 100644
--- a/python/functions/notebook/jupyter_kernel.md
+++ b/python/functions/notebook/jupyter_kernel.md
@@ -6,8 +6,8 @@ domain: notebook
 version: "1.0.0"
 purity: impure
 signature: "def jupyter_kernel_list(server_url: str = \"http://localhost:8888\", token: str = \"\") -> list[dict]"
-description: "CRUD completo de kernels Jupyter via REST API. Expone seis operaciones: list, start, restart, interrupt, shutdown y sessions. Usa solo stdlib (urllib, json), sin dependencias externas."
-tags: [jupyter, notebook, kernel, api, http, rest, sessions, crud]
+description: "CRUD completo de kernels Jupyter via REST API. Expone ocho operaciones: list, start, restart, interrupt, shutdown, sessions, cleanup y shutdown-all. Usa solo stdlib (urllib, json), sin dependencias externas."
+tags: [jupyter, notebook, kernel, api, http, rest, sessions, crud, cleanup]
 uses_functions: []
 uses_types: []
 returns: []
@@ -31,6 +31,8 @@ file_path: "python/functions/notebook/jupyter_kernel.py"
 | `jupyter_kernel_interrupt(server_url, token, kernel_id)` | `POST /api/kernels/{id}/interrupt` | Interrumpe ejecucion |
 | `jupyter_kernel_shutdown(server_url, token, kernel_id)` | `DELETE /api/kernels/{id}` | Apaga y elimina un kernel |
 | `jupyter_kernel_sessions(server_url, token)` | `GET /api/sessions` | Lista sesiones activas |
+| `jupyter_kernel_cleanup(server_url, token, idle_seconds)` | `GET + DELETE` | Apaga kernels inactivos |
+| `jupyter_kernel_shutdown_all(server_url, token)` | `GET + DELETE` | Apaga todos los kernels |
 
 ## Ejemplo
 
@@ -88,6 +90,12 @@ python python/functions/notebook/jupyter_kernel.py shutdown abc123-...
 
 # Listar sesiones
 python python/functions/notebook/jupyter_kernel.py sessions
+
+# Limpiar kernels inactivos (default: 1h sin actividad)
+python python/functions/notebook/jupyter_kernel.py cleanup --idle-seconds 1800
+
+# Apagar todos los kernels
+python python/functions/notebook/jupyter_kernel.py shutdown-all
 ```
 
 Todos los subcomandos aceptan `--server` y `--token`. El output es siempre JSON.
diff --git a/python/functions/notebook/jupyter_kernel.py b/python/functions/notebook/jupyter_kernel.py
index 7b603502..1e1bc89e 100644
--- a/python/functions/notebook/jupyter_kernel.py
+++ b/python/functions/notebook/jupyter_kernel.py
@@ -196,6 +196,80 @@ def jupyter_kernel_sessions(
     return sessions
 
 
+def jupyter_kernel_cleanup(
+    server_url: str = "http://localhost:8888",
+    token: str = "",
+    idle_seconds: int = 3600,
+) -> list[dict]:
+    """Apaga todos los kernels que llevan mas de idle_seconds sin actividad.
+
+    Util para liberar recursos en servidores con muchos notebooks abiertos.
+    Por defecto cierra kernels inactivos desde hace mas de 1 hora.
+
+    Args:
+        server_url: URL base del servidor Jupyter.
+        token: Token de autenticacion. Vacio si el servidor no requiere auth.
+        idle_seconds: Segundos de inactividad para considerar un kernel ocioso.
+
+    Returns:
+        Lista de dicts con los kernels apagados (id, name, last_activity, idle_seconds).
+
+    Raises:
+        urllib.error.HTTPError: Si la respuesta HTTP indica un error.
+        urllib.error.URLError: Si no se puede conectar al servidor.
+    """
+    from datetime import datetime, timezone
+
+    kernels = jupyter_kernel_list(server_url, token)
+    now = datetime.now(timezone.utc)
+    shutdown_list = []
+
+    for k in kernels:
+        last_activity = k.get("last_activity", "")
+        if not last_activity:
+            continue
+        try:
+            last_dt = datetime.fromisoformat(last_activity.replace("Z", "+00:00"))
+            idle = (now - last_dt).total_seconds()
+        except (ValueError, TypeError):
+            continue
+        if idle >= idle_seconds:
+            jupyter_kernel_shutdown(server_url, token, k["id"])
+            shutdown_list.append({
+                "id": k["id"],
+                "name": k.get("name", ""),
+                "last_activity": last_activity,
+                "idle_seconds": int(idle),
+            })
+
+    return shutdown_list
+
+
+def jupyter_kernel_shutdown_all(
+    server_url: str = "http://localhost:8888",
+    token: str = "",
+) -> list[dict]:
+    """Apaga todos los kernels activos del servidor.
+
+    Args:
+        server_url: URL base del servidor Jupyter.
+        token: Token de autenticacion. Vacio si el servidor no requiere auth.
+
+    Returns:
+        Lista de dicts con los kernels apagados (id, name).
+
+    Raises:
+        urllib.error.HTTPError: Si la respuesta HTTP indica un error.
+        urllib.error.URLError: Si no se puede conectar al servidor.
+    """
+    kernels = jupyter_kernel_list(server_url, token)
+    shutdown_list = []
+    for k in kernels:
+        jupyter_kernel_shutdown(server_url, token, k["id"])
+        shutdown_list.append({"id": k["id"], "name": k.get("name", "")})
+    return shutdown_list
+
+
 # ---------------------------------------------------------------------------
 # CLI
 # ---------------------------------------------------------------------------
@@ -248,6 +322,18 @@ if __name__ == "__main__":
     # sessions
     subparsers.add_parser("sessions", help="Lista las sesiones activas.")
 
+    # cleanup
+    sp_cleanup = subparsers.add_parser("cleanup", help="Apaga kernels inactivos.")
+    sp_cleanup.add_argument(
+        "--idle-seconds",
+        type=int,
+        default=3600,
+        help="Segundos de inactividad para considerar ocioso (default: 3600)",
+    )
+
+    # shutdown-all
+    subparsers.add_parser("shutdown-all", help="Apaga todos los kernels activos.")
+
     args = parser.parse_args()
 
     try:
@@ -267,6 +353,10 @@ if __name__ == "__main__":
             result = {"status": "shutdown", "kernel_id": args.kernel_id}
         elif args.command == "sessions":
             result = jupyter_kernel_sessions(args.server, args.token)
+        elif args.command == "cleanup":
+            result = jupyter_kernel_cleanup(args.server, args.token, args.idle_seconds)
+        elif args.command == "shutdown-all":
+            result = jupyter_kernel_shutdown_all(args.server, args.token)
         else:
             parser.print_help()
             sys.exit(1)
diff --git a/python/functions/notebook/jupyter_write.md b/python/functions/notebook/jupyter_write.md
index 1504a0f3..9f768d54 100644
--- a/python/functions/notebook/jupyter_write.md
+++ b/python/functions/notebook/jupyter_write.md
@@ -153,4 +153,5 @@ python -m notebook.jupyter_write delete notebooks/01.ipynb 3
 - NO ejecuta celdas — solo modifica la estructura. Para ejecutar, usar `jupyter_exec`.
 - `server_url` y `token` tienen defaults convenientes para desarrollo local (`http://localhost:8888`, token vacio).
 - El campo `cell_index` en el resultado refleja la posicion final de la celda en el notebook.
-- Patron tipico: `create` para crear el notebook, luego `batch` para poblar las celdas iniciales.
+- `append_code`, `append_markdown` y `batch` crean el notebook automaticamente si no existe (auto-create via REST). No es necesario llamar a `create` previamente.
+- Patron tipico: `batch` para poblar las celdas iniciales (crea el notebook si no existe), o `create` + `batch` si se necesita control explicito.
diff --git a/python/functions/notebook/jupyter_write.py b/python/functions/notebook/jupyter_write.py
index 9a8d3ba5..751aadfa 100644
--- a/python/functions/notebook/jupyter_write.py
+++ b/python/functions/notebook/jupyter_write.py
@@ -30,6 +30,35 @@ def _resolve_collab_username(server_url: str, token: str) -> str:
         return "Anonymous"
 
 
+# ---------------------------------------------------------------------------
+# Helpers internos
+# ---------------------------------------------------------------------------
+
+
+def _notebook_exists(notebook_path: str, server_url: str, token: str) -> bool:
+    """Comprueba si un notebook existe en el servidor Jupyter via HEAD /api/contents."""
+    headers = {"Accept": "application/json"}
+    if token:
+        headers["Authorization"] = f"token {token}"
+    check_url = f"{server_url}/api/contents/{notebook_path}"
+    req = Request(check_url, headers=headers, method="HEAD")
+    try:
+        with urlopen(req, timeout=5):
+            return True
+    except HTTPError as e:
+        if e.code == 404:
+            return False
+        raise
+
+
+def _auto_create_notebook(notebook_path: str, server_url: str, token: str) -> bool:
+    """Crea el notebook si no existe. Retorna True si fue creado."""
+    if not _notebook_exists(notebook_path, server_url, token):
+        jupyter_create_notebook(notebook_path, server_url=server_url, token=token)
+        return True
+    return False
+
+
 # ---------------------------------------------------------------------------
 # Helpers internos async
 # ---------------------------------------------------------------------------
@@ -42,6 +71,7 @@ async def _append_cell(
     server_url: str,
     token: str,
 ) -> dict:
+    _auto_create_notebook(notebook_path, server_url, token)
     ws_url = get_jupyter_notebook_websocket_url(
         server_url=server_url,
         token=token,
@@ -139,6 +169,7 @@ async def _batch_write(
     token: str,
 ) -> dict:
     """Anade multiples celdas en una sola conexion WebSocket."""
+    _auto_create_notebook(notebook_path, server_url, token)
     ws_url = get_jupyter_notebook_websocket_url(
         server_url=server_url,
         token=token,