diff --git a/__init__.py b/__init__.py
index 2d2cca4..d1274bc 100644
--- a/__init__.py
+++ b/__init__.py
@@ -265,6 +265,10 @@ def register_routes():
 
     from PIL import Image
 
+    from .repl import setup_custom_web_routes
+
+    setup_custom_web_routes(PromptServer.instance.app)
+
     with contextlib.suppress(ImportError):
         from cachetools import TTLCache
 
diff --git a/features.json b/features.json
new file mode 100644
index 0000000..9a58c45
--- /dev/null
+++ b/features.json
@@ -0,0 +1,3 @@
+{
+  "use_repl": false
+}
diff --git a/repl.py b/repl.py
new file mode 100644
index 0000000..b85391c
--- /dev/null
+++ b/repl.py
@@ -0,0 +1,637 @@
+import base64
+import code
+import io
+import re
+import sys
+from contextlib import redirect_stderr, redirect_stdout
+
+# import matplotlib.pyplot as plt
+import numpy as np
+import torch
+from aiohttp import web
+from PIL import Image
+from rich.console import Console
+from rich.traceback import Traceback
+
+from .log import log
+
+try:
+    import pyflakes.api
+    import pyflakes.reporter
+
+    _HAS_LINT = True
+except ImportError:
+    print(
+        "ComfyREPL: pyflakes not found. Linting will be disabled. Install with 'pip install pyflakes'."
+    )
+    _HAS_LINT = False
+
+# --- Linting Library ---
+# try:
+#     import ruff
+#     import ruff.lint
+#     import ruff.lint.linter
+#     import ruff.settings
+#
+#     _HAS_LINT = True
+# except ImportError:
+#     print(
+#         "ComfyREPL: ruff not found. Linting will be disabled. Install with 'pip install ruff'."
+#     )
+#     _HAS_LINT = False
+
+# --- Audio/Video Libraries ---
+try:
+    import scipy.io.wavfile
+
+    _HAS_SCIPY = True
+except ImportError:
+    print(
+        "ComfyREPL: SciPy not found. Audio display will be disabled. Install with 'pip install scipy'."
+    )
+    _HAS_SCIPY = False
+
+try:
+    import imageio
+    import imageio.plugins.ffmpeg  # Ensure ffmpeg plugin is available
+
+    _HAS_IMAGEIO = True
+except ImportError:
+    print(
+        "ComfyREPL: Imageio or imageio-ffmpeg not found. Video display will be disabled. Install with 'pip install imageio imageio-ffmpeg'."
+    )
+    _HAS_IMAGEIO = False
+
+
+# --- Audio Display ---
+class AudioDisplay:
+    def __init__(self, samples, sample_rate):
+        if not _HAS_SCIPY:
+            raise ImportError("Audio display requires scipy and numpy.")
+        if not isinstance(samples, (np.ndarray, torch.Tensor)):
+            raise TypeError(
+                "Audio samples must be a numpy array or torch tensor."
+            )
+        if isinstance(samples, torch.Tensor):
+            samples = samples.detach().cpu().numpy()
+
+        # Ensure samples are in a format scipy.io.wavfile can handle (e.g., int16, float32)
+        if samples.dtype == np.float64:
+            samples = samples.astype(np.float32)
+        elif samples.dtype == np.int64:
+            # Or scale to int32 if range requires
+            samples = samples.astype(np.int16)
+
+        self.samples = samples
+        self.sample_rate = sample_rate
+
+    def _to_wav_base64(self):
+        buffer = io.BytesIO()
+        try:
+            scipy.io.wavfile.write(buffer, self.sample_rate, self.samples)
+            audio_base64 = base64.b64encode(buffer.getvalue()).decode("utf-8")
+            return audio_base64
+        except Exception as e:
+            return f"<div style='color: red;'>Error encoding audio: {e}</div>"
+
+    def _repr_html_(self):
+        base64_data = self._to_wav_base64()
+        if base64_data.startswith("<div"):
+            return base64_data
+        return f'<audio controls src="data:audio/wav;base64,{base64_data}" style="margin: 5px 0;"/>'
+
+
+def render_audio(samples, sample_rate):
+    """
+    Render audio samples as an HTML audio player.
+
+    Args:
+        samples (np.ndarray or torch.Tensor): Audio samples.
+        sample_rate (int): Sample rate in Hz.
+
+    Returns
+    -------
+        AudioDisplay: An object that will render as an HTML audio player.
+    """
+    return AudioDisplay(samples, sample_rate)
+
+
+# --- Display Classes ---
+class VideoDisplay:
+    def __init__(self, frames, fps=24, options=None):
+        if not _HAS_IMAGEIO:  # numpy/PIL/torch needed for frames
+            raise ImportError(
+                "Video display requires imageio, imageio-ffmpeg, and image libraries (numpy, Pillow, torch)."
+            )
+
+        self.frames = []
+        for frame in frames:
+            if isinstance(frame, Image.Image):
+                self.frames.append(np.array(frame))
+            elif isinstance(frame, np.ndarray):
+                # Ensure HWC and uint8
+                if frame.ndim == 3 and frame.shape[0] in [1, 3, 4]:  # CHW
+                    frame = np.transpose(frame, (1, 2, 0))
+                if frame.dtype != np.uint8:
+                    frame = (
+                        (frame * 255).astype(np.uint8)
+                        if frame.max() <= 1.0
+                        else frame.astype(np.uint8)
+                    )
+                self.frames.append(frame)
+            elif isinstance(frame, torch.Tensor):
+                np_frame = frame.detach().cpu().numpy()
+                if np_frame.ndim == 3 and np_frame.shape[0] in [
+                    1,
+                    3,
+                    4,
+                ]:  # CHW
+                    np_frame = np.transpose(np_frame, (1, 2, 0))
+                if np_frame.dtype != np.uint8:
+                    np_frame = (
+                        (np_frame * 255).astype(np.uint8)
+                        if np_frame.max() <= 1.0
+                        else np_frame.astype(np.uint8)
+                    )
+                self.frames.append(np_frame)
+            else:
+                raise TypeError(
+                    f"Unsupported frame type: {type(frame)}. Must be PIL.Image, numpy.ndarray, or torch.Tensor."
+                )
+
+        self.fps = fps
+        self.options = options if options is not None else {}
+
+    def _to_mp4_base64(self):
+        buffer = io.BytesIO()
+        try:
+            # Use imageio to write frames to an in-memory MP4 file
+            imageio.mimwrite(
+                buffer,
+                self.frames,
+                format="mp4",
+                fps=self.fps,
+                codec="libx264",
+                quality=8,
+            )  # quality 1-10
+            video_base64 = base64.b64encode(buffer.getvalue()).decode("utf-8")
+            return video_base64
+        except Exception as e:
+            return f"<div style='color: red;'>Error encoding video: {e}</div>"
+
+    def _repr_html_(self):
+        base64_data = self._to_mp4_base64()
+        if base64_data.startswith("<div"):  # Check if it's an error message
+            return base64_data
+
+        # Build HTML options string
+        option_str = ""
+        for key, value in self.options.items():
+            if isinstance(value, bool) and value:
+                option_str += f" {key}"
+            elif isinstance(value, str):
+                option_str += f' {key}="{value}"'
+            else:
+                option_str += f' {key}="{value}"'  # Fallback for numbers etc.
+
+        return f'<video controls src="data:video/mp4;base64,{base64_data}" style="max-width: 100%; height: auto; border: 1px solid #555; margin: 5px 0;"{option_str}/>'
+
+
+def render_video(batch_tensor_or_array_of_pil_images, fps=24, options=None):
+    """
+    Render video frames as an HTML video player.
+
+    Args:
+        batch_tensor_or_array_of_pil_images (list of PIL.Image, np.ndarray, or torch.Tensor):
+            A list of frames, or a single batch tensor/array (B, H, W, C) or (B, C, H, W).
+        fps (int): Frames per second.
+        options (dict): Dictionary of HTML <video> tag attributes (e.g., {"loop": True, "autoplay": True}).
+
+    Returns
+    -------
+        VideoDisplay: An object that will render as an HTML video player.
+    """
+    frames_list = []
+    if isinstance(
+        batch_tensor_or_array_of_pil_images, (np.ndarray, torch.Tensor)
+    ):
+        # Assume it's a batch tensor/array
+        for i in range(batch_tensor_or_array_of_pil_images.shape[0]):
+            frames_list.append(batch_tensor_or_array_of_pil_images[i])
+    elif isinstance(batch_tensor_or_array_of_pil_images, list):
+        frames_list = batch_tensor_or_array_of_pil_images
+    else:
+        raise TypeError(
+            "Input for render_video must be a list of frames or a batch tensor/array."
+        )
+
+    return VideoDisplay(frames_list, fps, options)
+
+
+class ComfyREPLBackend:
+    def __init__(self):
+        self.repl_consoles: dict[str, code.InteractiveConsole] = {}
+        # self.repl_console = None
+        self.image_outputs = []
+        self.audio_outputs = []
+        self.video_outputs = []
+        self._original_displayhook = sys.displayhook
+        # self._init_repl_console()
+
+    @staticmethod
+    def _init_repl_console():
+        """Define the globals that will be available in the REPL session."""
+        repl_globals = {"__builtins__": __builtins__}
+        # repl_globals["plt"] = plt
+        repl_globals["np"] = np
+        repl_globals["Image"] = Image
+        repl_globals["torch"] = torch
+
+        repl_globals["repl_display"] = _repl_display_image
+        if _HAS_SCIPY:
+            repl_globals["render_audio"] = render_audio
+        if _HAS_IMAGEIO:
+            repl_globals["render_video"] = render_video
+
+        return code.InteractiveConsole(locals=repl_globals)
+
+    def _custom_displayhook(self, value):
+        """
+        Displayhook that capture and process image, audio, video objects.
+
+        For other objects, it fallsback to the original displayhook.
+        """
+        if value is None:
+            return
+
+        # Attempt to handle as an image
+        if (
+            isinstance(value, (Image.Image, np.ndarray, torch.Tensor))
+            # or (
+            #     hasattr(value, "figure")
+            #     and isinstance(value.figure, plt.Figure)
+            # )
+            # or isinstance(value, plt.Figure)
+        ):
+            img_html = _repl_display_image(value)
+            self.image_outputs.append(img_html)
+            return
+
+        # Attempt to handle as audio
+        elif isinstance(value, AudioDisplay):
+            audio_html = value._repr_html_()
+            self.audio_outputs.append(audio_html)
+            return
+
+        # Attempt to handle as video
+        elif isinstance(value, VideoDisplay):
+            video_html = value._repr_html_()
+            self.video_outputs.append(video_html)
+            return
+
+        else:
+            # If not a special media type, let the original displayhook handle it.
+            self._original_displayhook(value)
+
+    def _console_to_html(
+        self, stream: io.StringIO | Traceback, width: int = 120
+    ) -> str:
+        if isinstance(stream, io.StringIO):
+            captured_text_output = stream.getvalue()
+        else:
+            captured_text_output = Traceback
+
+        html_console = Console(
+            file=io.StringIO(), record=True, force_terminal=True, width=width
+        )
+        html_console.print(captured_text_output)
+
+        return html_console.export_html(inline_styles=True)
+
+    def get_console(self, node_name: str):
+        console = self.repl_consoles.get(node_name)
+        if console:
+            return console
+
+        console = self._init_repl_console()
+        self.repl_consoles[node_name] = console
+        return self.repl_consoles[node_name]
+
+    def execute_code(self, node_name: str, code: str):
+        # Clear outputs from previous execution
+        self.image_outputs = []
+        self.audio_outputs = []
+        self.video_outputs = []
+
+        output_html = ""
+        error_message = None
+
+        repl_console = self.get_console(node_name)
+
+        string_io = io.StringIO()
+
+        # Temporarily patch sys.displayhook
+        sys.displayhook = self._custom_displayhook
+
+        try:
+            with redirect_stdout(string_io), redirect_stderr(string_io):
+                for line in code.splitlines():
+                    repl_console.push(line)
+
+            full_rich_html = self._console_to_html(string_io)
+            match = re.search(
+                r"<body.*?>(.*?)</body>", full_rich_html, re.DOTALL
+            )
+            if match:
+                output_html = match.group(1)
+            else:
+                output_html = full_rich_html
+
+            # Append any captured media HTML *after* the rich text output
+            for img_html in self.image_outputs:
+                output_html += img_html
+            for audio_html in self.audio_outputs:
+                output_html += audio_html
+            for video_html in self.video_outputs:
+                output_html += video_html
+
+        except Exception as e:
+            exc_type, exc_value, exc_traceback = sys.exc_info()
+            rich_traceback = Traceback.from_exception(
+                exc_type,
+                exc_value,
+                exc_traceback,
+                show_locals=True,
+                suppress=[__file__],
+            )
+            # error_console = Console(
+            # file=io.StringIO(), record=True, force_terminal=True, width=120
+            # )
+            # error_console.print(rich_traceback)
+            # full_error_html = error_console.export_html(inline_styles=True)
+
+            full_error_html = self._console_to_html(rich_traceback)
+
+            match = re.search(
+                r"<body.*?>(.*?)</body>", full_error_html, re.DOTALL
+            )
+            output_html = match.group(1) if match else full_error_html
+
+            error_message = str(e)
+        finally:
+            sys.displayhook = (
+                self._original_displayhook
+            )  # Always restore original displayhook
+
+        return {"output_html": output_html, "error": error_message}
+
+    def lint_code(self, node_name: str, code: str):
+        diagnostics = []
+
+        if not _HAS_LINT:
+            diagnostics.append(
+                {
+                    "row": 0,
+                    "column": 0,
+                    "text": "Pyflakes not installed. Linting disabled. Install with 'uv add pyflakes'.",
+                    "type": "warning",
+                }
+            )
+            return web.json_response({"diagnostics": diagnostics})
+
+        # Use a custom reporter to capture messages
+        class PyflakesReporter(pyflakes.reporter.Reporter):
+            def __init__(self):
+                self.messages = []
+                # Suppress stdout/stderr from pyflakes itself
+                self._stdout = io.StringIO()
+                self._stderr = io.StringIO()
+                super().__init__(self._stdout, self._stderr)
+
+            def flake(self, message):
+                # Ace editor expects 0-indexed row, pyflakes gives 1-indexed lineno
+                self.messages.append(
+                    {
+                        "row": message.lineno - 1,
+                        "column": message.col,
+                        "text": str(message),
+                        "type": "warning",  # pyflakes usually gives warnings
+                    }
+                )
+
+            def unexpectedError(self, filename, msg):
+                self.messages.append(
+                    {
+                        "row": 0,
+                        "column": 0,
+                        "text": f"Pyflakes internal error: {msg}",
+                        "type": "error",
+                    }
+                )
+
+            def syntaxError(self, filename, msg, lineno, offset, text):
+                log.info(f"Received {text} to syntax error")
+                self.messages.append(
+                    {
+                        "row": lineno - 1,  # Ace is 0-indexed
+                        "column": offset,
+                        "text": f"Syntax Error: {msg}",
+                        "type": "error",
+                    }
+                )
+
+        reporter = PyflakesReporter()
+        pyflakes.api.check(code, node_name, reporter)
+
+        return {"diagnostics": reporter.messages}
+
+    def lint_code_ruff(self, code: str):
+        diagnostics = []
+
+        if not _HAS_LINT:
+            diagnostics.append(
+                {
+                    "row": 0,
+                    "column": 0,
+                    "text": "Ruff not installed. Linting disabled. Install with 'pip install ruff'.",
+                    "type": "warning",
+                }
+            )
+            return {"diagnostics": diagnostics}
+
+        # Define the builtins/globals that Ruff should recognize
+        # These are the names we inject into the REPL's scope
+        repl_builtins = [
+            "repl_display",
+            "render_audio",
+            "render_video",
+            # "plt",
+            "np",
+            "Image",
+            "torch",
+        ]
+
+        try:
+            # Lint the code using Ruff's programmatic API
+            result = ruff.lint.linter.lint_stdin(
+                code.encode("utf-8"),
+                path="<stdin>",
+                builtins=repl_builtins,
+            )
+
+            for diagnostic in result.diagnostics:
+                diag_type = "warning"  # Default
+                # Ruff's error codes: F (Pyflakes), E (Pycodestyle), W (Pycodestyle warning), I (isort), N (naming), etc.
+                # F821: Undefined name (often an error)
+                if (
+                    diagnostic.kind.code.startswith("E")
+                    or diagnostic.kind.code == "F821"
+                ):
+                    diag_type = "error"
+                elif diagnostic.kind.code.startswith("W"):
+                    diag_type = "warning"
+
+                diagnostics.append(
+                    {
+                        "row": diagnostic.location.row - 1,  # Ace is 0-indexed
+                        "column": diagnostic.location.column
+                        - 1,  # Ace is 0-indexed
+                        "text": diagnostic.message,
+                        "type": diag_type,
+                    }
+                )
+
+        except Exception as e:
+            diagnostics.append(
+                {
+                    "row": 0,
+                    "column": 0,
+                    "text": f"Ruff internal error: {e}",
+                    "type": "error",
+                }
+            )
+
+        return {"diagnostics": diagnostics}
+
+
+def _repl_display_image(img_data):
+    """
+    Internal function to convert image data (PIL, numpy, torch, matplotlib) to base64 HTML.
+    """
+    pil_img = None
+    # fig = None
+
+    if isinstance(img_data, Image.Image):
+        pil_img = img_data
+    elif isinstance(img_data, np.ndarray):
+        # Handle different numpy array shapes (HWC, CHW)
+        if img_data.ndim == 3:
+            if img_data.shape[0] in [1, 3, 4]:  # Likely CHW
+                if img_data.shape[0] == 1:  # Grayscale
+                    img_data = img_data.squeeze(0)
+                else:  # Color
+                    img_data = np.transpose(img_data, (1, 2, 0))  # CHW to HWC
+            # Ensure it's uint8 for PIL, assuming float [0,1] or int [0,255]
+            if img_data.dtype != np.uint8:
+                img_data = (
+                    (img_data * 255).astype(np.uint8)
+                    if img_data.max() <= 1.0
+                    else img_data.astype(np.uint8)
+                )
+        pil_img = Image.fromarray(img_data)
+    elif isinstance(img_data, torch.Tensor):
+        # Move to CPU, convert to numpy
+        np_img = img_data.detach().cpu().numpy()
+        # Handle different tensor shapes (CHW, HWC)
+        if np_img.ndim == 3:
+            if np_img.shape[0] in [1, 3, 4]:  # Likely CHW
+                if np_img.shape[0] == 1:  # Grayscale
+                    np_img = np_img.squeeze(0)
+                else:  # Color
+                    np_img = np.transpose(np_img, (1, 2, 0))  # CHW to HWC
+            # Ensure it's uint8 for PIL, assuming float [0,1] or int [0,255]
+            if np_img.dtype != np.uint8:
+                np_img = (
+                    (np_img * 255).astype(np.uint8)
+                    if np_img.max() <= 1.0
+                    else np_img.astype(np.uint8)
+                )
+        pil_img = Image.fromarray(np_img)
+    # elif hasattr(img_data, "figure") and isinstance(
+    #     img_data.figure, plt.Figure
+    # ):
+    #     # If it's a matplotlib Axes object, get its figure
+    #     fig = img_data.figure
+    # elif isinstance(img_data, plt.Figure):
+    #     fig = img_data
+    else:
+        return f"<div style='color: red;'>Unsupported image type for display: {type(img_data)}</div>"
+
+    buffer = io.BytesIO()
+    try:
+        if pil_img:
+            pil_img.save(buffer, format="PNG")
+        # elif fig:
+        #     fig.savefig(
+        #         buffer, format="PNG", bbox_inches="tight", pad_inches=0.1
+        #     )
+        #     plt.close(
+        #         fig
+        #     )  # Close the figure to prevent it from showing up in other contexts
+        else:
+            return (
+                "<div style='color: red;'>Could not process image data.</div>"
+            )
+    except Exception as e:
+        return f"<div style='color: red;'>Error saving image: {e}</div>"
+
+    img_base64 = base64.b64encode(buffer.getvalue()).decode("utf-8")
+    return f'<img src="data:image/png;base64,{img_base64}" style="max-width: 100%; height: auto; border: 1px solid #555; margin: 5px 0;"/>'
+
+
+# Instantiate the backend class globally
+_comfy_repl_backend = ComfyREPLBackend()
+
+
+# Update aiohttp handlers to use the backend instance
+async def repl_execute_code_handler(request):
+    data = await request.json()
+
+    name = data.get("name")
+
+    if name is None:  # we send an error
+        return web.Response(
+            status=417, reason="Expectation Failed", text="Missing name key"
+        )
+    code = data.get("code", "")
+    result = _comfy_repl_backend.execute_code(name, code)
+    return web.json_response(result)
+
+
+async def repl_lint_code_handler(request):
+    data = await request.json()
+    name = data.get("name")
+
+    if name is None:  # we send an error
+        return web.Response(
+            status=417, reason="Expectation Failed", text="Missing name key"
+        )
+        # raise web.HTTPExpectationFailed(
+        # reason="Missing name key (reason)", text="Missing name key (text)"
+        # )
+
+    code = data.get("code", "")
+    result = _comfy_repl_backend.lint_code(name, code)
+    return web.json_response(result)
+
+
+def setup_custom_web_routes(app: web.Application):
+    """
+    Function to register our custom web routes with the ComfyUI server.
+    """
+    log.info("ComfyREPL: Registering /mtb/execute route...")
+    app.router.add_post("/mtb/execute", repl_execute_code_handler)
+    app.router.add_post("/mtb/lint", repl_lint_code_handler)
+
+
+# You can add more routes here if needed, e.g., for clearing state.
diff --git a/web/mtb_repl.js b/web/mtb_repl.js
new file mode 100644
index 0000000..2dacb5c
--- /dev/null
+++ b/web/mtb_repl.js
@@ -0,0 +1,529 @@
+/** Python REPL for the frontend (uses rich)*/
+
+import { app } from '../../scripts/app.js'
+import * as shared from './comfy_shared.js'
+import * as mtb_ui from './mtb_ui.js'
+
+class ComfyREPL extends LiteGraph.LGraphNode {
+  constructor() {
+    super()
+
+    this.shape = LiteGraph.BOX_SHAPE
+    this.isVirtualNode = true
+    this.category = 'mtb/repl'
+    this.title = '🐍 REPL (mtb)'
+
+    this.uuid = shared.makeUUID()
+
+    this.size = [600, 400]
+
+    // Create a container for our custom widgets
+    this.widget = this.addDOMWidget('HTML', 'html', this.createREPLWidget())
+
+    this.loadAceEditor()
+
+    // Store input and output for persistence
+    this.properties = {
+      inputCode: '',
+      outputHistory: '',
+    }
+
+    this.outputArea.innerHTML = this.properties.outputHistory
+    this.outputArea.scrollTop = this.outputArea.scrollHeight
+
+    // Debounced linting function
+    this.debouncedLint = shared.debounce(this.lintCode.bind(this), 500)
+
+    // Resizing state variables
+    this.isResizing = false
+    this.initialMouseY = 0
+    this.initialInputHeight = 0
+    this.initialOutputHeight = 0
+  }
+
+  loadAceEditor() {
+    if (window.MTB?.ace_loaded) {
+      return
+    }
+    let NEED_PATCH = false
+    if (window.ace) {
+      shared.infoLogger(
+        'A global ace was found in scope, to avoid issues with it we will patch it',
+      )
+      NEED_PATCH = true
+      // window._backupAce = window.ace
+      // window.ace = null
+    }
+
+    shared
+      .loadScript('/mtb_async/ace/ace.js')
+      .then((m) => {
+        shared.infoLogger('ACE was loaded', m)
+        // window.MTB_ACE = window.ace
+        window.MTB.ace_loaded = true
+        this.initAceEditor()
+
+        this.aceEditor.setValue(this.properties.inputCode, -1)
+      })
+      .catch((e) => {
+        shared.errorLogger(e)
+      })
+      .finally(() => {
+        if (NEED_PATCH) {
+          console.log('Patching back window object')
+          window.ace = window._backupAce
+        }
+      })
+  }
+
+  initAceEditor() {
+    if (!window.MTB.ace_loaded) {
+      console.error('ACE editor not loaded. Cannot set up editors.')
+      return
+    }
+
+    if (!this.inputDiv) {
+      console.error('Input div not found for Ace editor initialization.')
+      return
+    }
+    this.aceEditor = ace.edit(this.inputDiv)
+    this.aceEditor.setTheme('ace/theme/monokai') //"ace/theme/dracula", "ace/theme/github"
+    this.aceEditor.session.setMode('ace/mode/python')
+    this.aceEditor.setOptions({
+      enableBasicAutocompletion: true,
+      enableLiveAutocompletion: true,
+      enableSnippets: true,
+      fontSize: '14px',
+      fontFamily: 'monospace',
+      showPrintMargin: false,
+      wrap: true,
+      tabSize: 4,
+      useSoftTabs: true,
+      highlightActiveLine: true,
+      highlightSelectedWord: true,
+      cursorStyle: 'ace', // "ace" | "slim" | "smooth" | "wide"
+      behavioursEnabled: true,
+      displayIndentGuides: true,
+      fixedWidthGutter: true,
+      scrollPastEnd: 0.5,
+    })
+
+    // Custom keybinding for Ctrl+Enter
+    this.aceEditor.commands.addCommand({
+      name: 'runCode',
+      bindKey: { win: 'Ctrl-Enter', mac: 'Command-Enter' },
+      exec: () => this.executeCode(),
+    })
+
+    // Listen for changes to trigger linting
+    let lintDisabled = false
+    this.aceEditor.session.on('change', () => {
+      if (!lintDisabled) {
+        this.debouncedLint()
+      }
+    })
+
+    this.outputArea.scrollTop = this.outputArea.scrollHeight
+  }
+
+  addOutput(html) {
+    this.outputArea.innerHTML += html
+    this.properties.outputHistory += html
+    this.outputArea.scrollTop = this.outputArea.scrollHeight
+  }
+
+  createREPLWidget() {
+    const container = mtb_ui.makeElement('div', {
+      display: 'flex',
+      flexDirection: 'column',
+      width: '100%',
+      height: '100%',
+      boxSizing: 'border-box',
+      padding: '5px',
+    })
+
+    this.inputDiv = mtb_ui.makeElement(
+      'div',
+      {
+        width: 'calc(100% - 10px)',
+        height: '100px',
+        backgroundColor: '#333',
+        color: '#eee',
+        border: '1px solid #555',
+        borderRadius: '4px',
+        marginBottom: '5px',
+        boxSizing: 'border-box',
+        overflow: 'hidden',
+      },
+      container,
+    )
+    // Resizable Handle
+    this.handleDiv = mtb_ui.makeElement(
+      'div',
+      {
+        width: '100%',
+        height: '5px',
+        backgroundColor: '#666',
+        cursor: 'ns-resize',
+        marginBottom: '5px',
+        borderRadius: '2px',
+      },
+      container,
+    )
+    this.handleDiv.addEventListener('mousedown', this.startResizing.bind(this))
+
+    // Run Button
+    this.runButton = mtb_ui.makeElement(
+      'button',
+      {
+        width: '100%',
+        padding: '8px',
+        backgroundColor: '#555',
+        color: '#fff',
+        border: 'none',
+        borderRadius: '4px',
+        cursor: 'pointer',
+        marginBottom: '5px',
+        fontSize: '14px',
+      },
+      container,
+    )
+    this.runButton.textContent = 'Run Code (Ctrl+Enter)'
+    this.runButton.onclick = () => this.executeCode()
+
+    // Clear Button
+    this.clearButton = mtb_ui.makeElement(
+      'button',
+      {
+        width: '100%',
+        padding: '8px',
+        backgroundColor: '#555',
+        color: '#fff',
+        border: 'none',
+        borderRadius: '4px',
+        cursor: 'pointer',
+        marginBottom: '5px',
+        fontSize: '14px',
+      },
+      container,
+    )
+    this.clearButton.textContent = 'Clear Output'
+    this.clearButton.onclick = () => {
+      this.outputArea.innerHTML = ''
+      this.properties.outputHistory = ''
+    }
+
+    // Output Area
+    this.outputArea = mtb_ui.makeElement(
+      'div',
+      {
+        flexGrow: '1',
+        width: 'calc(100% - 10px)',
+        backgroundColor: '#222',
+        color: '#ddd',
+        border: '1px solid #555',
+        borderRadius: '4px',
+        padding: '5px',
+        fontFamily: 'monospace',
+        fontSize: '14px',
+        overflowY: 'auto',
+        whiteSpace: 'pre-wrap',
+        boxSizing: 'border-box',
+      },
+      container,
+    )
+
+    return container
+  }
+
+  // --- Resizing Logic ---
+  startResizing(e) {
+    if (!this.inputDiv) {
+      shared.infoLogger("The input div isn't ready", this)
+      shared.errorLogger("The input div isn't ready")
+      return
+    }
+    this.isResizing = true
+    this.initialMouseY = e.clientY
+    this.initialInputHeight = this.inputDiv.offsetHeight
+    this.initialOutputHeight = this.outputArea.offsetHeight
+
+    document.addEventListener('mousemove', this.doResize.bind(this))
+    document.addEventListener('mouseup', this.stopResizing.bind(this))
+    document.body.style.cursor = 'ns-resize' // Change cursor globally
+  }
+  doResize(e) {
+    if (!this.isResizing) return
+
+    const deltaY = e.clientY - this.initialMouseY
+
+    let new_input_height = this.initialInputHeight + deltaY
+    let new_output_height = this.initialOutputHeight - deltaY
+
+    const minInputHeight = 50 // Minimum height for Ace editor
+    const minOutputHeight = 50 // Minimum height for output area
+
+    // Clamp heights to minimums
+    if (new_input_height < minInputHeight) {
+      new_input_height = minInputHeight
+      new_output_height =
+        this.initialInputHeight + this.initialOutputHeight - minInputHeight
+    }
+    if (new_output_height < minOutputHeight) {
+      new_output_height = minOutputHeight
+      new_input_height =
+        this.initialInputHeight + this.initialOutputHeight - minOutputHeight
+    }
+
+    this.inputDiv.style.height = `${new_input_height}px`
+    this.outputArea.style.height = `${new_output_height}px`
+
+    // Update the stored ratio for persistence
+    const totalDynamicHeight =
+      this.inputDiv.offsetHeight + this.outputArea.offsetHeight
+    if (totalDynamicHeight > 0) {
+      this.properties.inputHeightRatio = new_input_height / totalDynamicHeight
+    }
+
+    this.aceEditor.resize() // Important for Ace to redraw
+  }
+
+  stopResizing() {
+    this.isResizing = false
+    document.removeEventListener('mousemove', this.doResize)
+    document.removeEventListener('mouseup', this.stopResizing)
+    document.body.style.cursor = '' // Restore default cursor
+  }
+  // --- End Resizing Logic ---
+
+  async executeCode() {
+    const code = this.aceEditor.getValue()
+
+    if (!code.trim()) {
+      return
+    }
+
+    const inputPrompt = `<div style="color:#888; margin-top: 10px;">>>> ${code}</div>`
+
+    this.addOutput(inputPrompt)
+
+    try {
+      const response = await fetch('/mtb/execute', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({ code: code, name: this.uuid }),
+      })
+
+      if (!response.ok) {
+        throw new Error(`HTTP error! status: ${response.status}`)
+      }
+
+      const result = await response.json()
+      console.debug('Received from backend', result)
+      const outputHtml = result.output_html || ''
+      const error = result.error
+
+      if (error) {
+        this.addOutput(
+          `<div style="color: #f00; font-weight: bold;">Error:</div>${outputHtml}`,
+        )
+      } else {
+        this.addOutput(outputHtml)
+      }
+    } catch (e) {
+      const errorMessage = `<div style="color: #f00;">Frontend Error: ${e.message}</div>`
+
+      this.addOutput(errorMessage)
+      console.error('ComfyREPL Frontend Error:', e)
+    } finally {
+      // Not clearing
+      // this.inputArea.value = '' // Clear input after execution
+      // this.properties.inputCode = '' // Clear persisted input
+    }
+  }
+
+  async lintCode() {
+    if (!this.aceEditor) {
+      return
+    }
+    const code = this.aceEditor.getValue()
+    if (!code.trim()) {
+      this.aceEditor.session.setAnnotations([]) // Clear annotations if empty
+      return
+    }
+
+    try {
+      const response = await fetch('/mtb/lint', {
+        // New linting endpoint
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({ code: code, name: this.uuid }),
+      })
+
+      if (!response.ok) {
+        console.log(response)
+        throw new Error(
+          `HTTP error! status: ${response.status} ${response.statusText}`,
+        )
+      }
+
+      const result = await response.json()
+      // result.diagnostics should be an array of {row, column, text, type}
+      this.aceEditor.session.setAnnotations(result.diagnostics)
+    } catch (e) {
+      console.error('ComfyREPL Linting Error:', e)
+      this.aceEditor.session.setAnnotations([
+        {
+          row: 0,
+          column: 0,
+          text: `Linting failed: ${e.message}`,
+          type: 'error',
+        },
+      ])
+    }
+  }
+
+  // Restore properties when loading a graph
+  onConfigure() {
+    if (this.properties.inputCode && this.aceEditor) {
+      this.aceEditor.setValue(this.properties.inputCode, -1)
+    }
+    // if (this.properties.inputCode) {
+    //   this.inputArea.value = this.properties.inputCode
+    // }
+    if (this.properties.outputHistory) {
+      this.outputArea.innerHTML = this.properties.outputHistory
+      this.outputArea.scrollTop = this.outputArea.scrollHeight
+    }
+    if (this.properties.uuid) {
+      this.uuid = this.properties.uuid
+    }
+    this.debouncedLint()
+    this.onResize(this.size)
+  }
+
+  // Save properties when saving a graph
+  onSerialize(o) {
+    if (this.aceEditor) {
+      o.properties.inputCode = this.aceEditor.getValue() //this.inputArea.value
+    }
+    o.properties.outputHistory = this.outputArea.innerHTML
+    o.properties.uuid = this.uuid
+    o.properties.inputHeightRatio = this.properties.inputHeightRatio
+  }
+
+  onRemoved() {
+    // Clean up DOM elements when node is removed
+    if (this.widget?.element?.parentNode) {
+      this.widget.element.parentNode.removeChild(this.widget.element)
+    }
+    // Destroy Ace editor instance to prevent memory leaks
+    if (this.aceEditor) {
+      this.aceEditor.destroy()
+      this.aceEditor.container.remove() // Remove the Ace container div from DOM
+    }
+    // Clean up global event listeners if node is removed while resizing
+    document.removeEventListener('mousemove', this.doResize)
+    document.removeEventListener('mouseup', this.stopResizing)
+    document.body.style.cursor = ''
+  }
+  // LiteGraph method to handle node resizing
+  onResize(size) {
+    // Call parent method if it exists (important for LiteGraph's internal sizing)
+    if (super.onResize) {
+      super.onResize(size)
+    }
+
+    // Adjust container size
+    const container = this.widget.element
+    container.style.width = `${size[0] - 10}px` // Account for padding
+    container.style.height = `${size[1] - 10}px`
+
+    // Adjust input and output area widths
+    this.inputDiv.style.width = 'calc(100% - 10px)'
+    this.outputArea.style.width = 'calc(100% - 10px)'
+    //
+    // const old = () => {
+    //   // Calculate remaining height for output area
+    //   // Ace editor manages its own height within this.inputDiv, so we use offsetHeight
+    //   const inputHeight = this.inputDiv.offsetHeight
+    //   const runButtonHeight = this.runButton.offsetHeight
+    //   const clearButtonHeight = this.clearButton.offsetHeight
+    //   const totalFixedHeight =
+    //     inputHeight + runButtonHeight + clearButtonHeight + 15 // 15 for margins/padding
+    //
+    //   const remainingHeight = size[1] - 10 - totalFixedHeight
+    //   this.outputArea.style.height = `${Math.max(50, remainingHeight)}px` // Min height 50px
+    // }
+    // Calculate dynamic heights
+    const containerHeight = size[1] - 10
+    const handleHeight = this.handleDiv.offsetHeight
+    const buttonHeights =
+      this.runButton.offsetHeight + this.clearButton.offsetHeight + 15 // Sum of button heights + margins
+
+    const dynamicContentHeight = containerHeight - buttonHeights - handleHeight
+
+    const minInputHeight = 50
+    const minOutputHeight = 50
+
+    let inputHeight = Math.max(
+      minInputHeight,
+      dynamicContentHeight * (this.properties.inputHeightRatio || 1.0),
+    )
+    let outputHeight = Math.max(
+      minOutputHeight,
+      dynamicContentHeight - inputHeight,
+    )
+    //
+    // // Re-distribute if one hits its minimum
+    // if (
+    //   inputHeight === minInputHeight &&
+    //   dynamicContentHeight - minInputHeight > minOutputHeight
+    // ) {
+    //   outputHeight = dynamicContentHeight - minInputHeight
+    // } else if (
+    //   outputHeight === minOutputHeight &&
+    //   dynamicContentHeight - minOutputHeight > minInputHeight
+    // ) {
+    //   inputHeight = dynamicContentHeight - minOutputHeight
+    // }
+    //
+    // // Final check to ensure total height matches available dynamic space
+    // const currentTotal = inputHeight + outputHeight
+    // if (currentTotal !== dynamicContentHeight) {
+    //   // Adjust one of them if there's a small discrepancy due to rounding
+    //   if (inputHeight > minInputHeight) {
+    //     inputHeight += dynamicContentHeight - currentTotal
+    //   } else if (outputHeight > minOutputHeight) {
+    //     outputHeight += dynamicContentHeight - currentTotal
+    //   }
+    // }
+
+    this.inputDiv.style.height = `${inputHeight}px`
+    this.outputArea.style.height = `${outputHeight}px`
+
+    // Update the ratio based on the actual heights set
+    if (dynamicContentHeight > 0) {
+      this.properties.inputHeightRatio = inputHeight / dynamicContentHeight
+    }
+
+    // Inform Ace editor about the resize so it can redraw its content
+    if (this.aceEditor) {
+      this.aceEditor.resize()
+    }
+  }
+}
+
+const repl = {
+  name: 'mtb.repl',
+
+  registerCustomNodes() {
+    LiteGraph.registerNodeType('Python REPL', ComfyREPL)
+  },
+}
+
+app.registerExtension(repl)