pywebview DevTools Helper

pywebview-devtools is the optional native helper package for pywebview-devtools-mcp.

Install it in the same Python environment as your pywebview app:

pip install pywebview-devtools

Enable it before creating pywebview windows:

import pywebview_devtools
import webview

pywebview_devtools.enable()

remote_port = pywebview_devtools.remote_debugging_port()
if remote_port:
    webview.settings["REMOTE_DEBUGGING_PORT"] = remote_port

window = webview.create_window("Demo", "https://example.com")
webview.start(debug=True)

The helper only starts when PYWEBVIEW_DEVTOOLS is enabled. Launch mode in the MCP server sets this automatically. For manual attach mode, set PYWEBVIEW_DEVTOOLS=1 before starting the app and provide stable helper connection values with PYWEBVIEW_DEVTOOLS_HOST, PYWEBVIEW_DEVTOOLS_PORT, and PYWEBVIEW_DEVTOOLS_TOKEN when needed.

The helper listens on a local HTTP endpoint and requires a Bearer token. Treat the token as sensitive and avoid enabling the helper in production builds unless you have a deliberate debugging workflow.