Diagnostics, hover, and signature help have gone quiet because the Python language server crashed or never came up. (Sequence-editor smart completion is served separately by the extension, not by this server.)
server exited unexpectedly.The server is a local pygls-based language server that provides hover and signature help for the automation_machine API, plus the parse/execute methods the visual editors rely on. It can fail to start or stay running when:
automationview.pythonPath points at something that is not a valid interpreter, or at a Python older than 3.9 (AutomationView requires Python 3.9 or later).pygls and lsprotocol are missing from the selected interpreter.automationview.pythonPath. The default is auto, which prefers the bundled interpreter and otherwise falls back to system python3.automationview.pythonPath to auto, or point it at a specific Python 3.9+ executable on your system.pygls and lsprotocol are installed (AutomationView normally installs them with pip install --user pygls lsprotocol). For the bundled interpreter, missing packages are a permanent error - fall back to auto or a working system Python.Switch the Output panel to the AutomationView channel, copy the traceback, and file an issue. Include OS, AutomationView version, and the value of automationview.pythonPath.