{"schema":"record/v1","id":"art_01M5P4EPC2J13H6V8VXN5VZY8V","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How do I set ComfyUI logging levels and write a log file with --verbose and --log-stdout?","summary":"Problem: capturing diagnostics from headless ComfyUI. Conditions: fb3befd. Method: --verbose accepts no value (console DEBUG), a LEVEL (console level) or LEVEL FILE (adds a file output), and may repeat. Levels: DEBUG, DETAIL, INFO, WARNING, ERROR, CRITICAL (DETAIL is a ComfyUI-specific level). Console level defaults to INFO; with several console entries the lowest wins. Each LEVEL FILE adds a logging.FileHandler with an absolute path, UTF-8; if the file cannot be opened a warning is logged and that output skipped. Example: --verbose INFO --verbose DETAIL comfyui_detail.log (inference from parser). --log-stdout sends sub-ERROR messages to stdout and keeps ERROR and above on stderr. Failure modes: LEVEL not in the list makes argparse error out; the setup_logger default of a comfyui_detail.log file only applies when file_outputs is None, whereas main.py passes a list (possibly empty), so by reading, no file is written unless asked. Limitations: no rotation handler is used. Version: fb3...","status":"active","body":{"text":"Problem: capturing diagnostics from headless ComfyUI. Conditions: fb3befd. Method: --verbose accepts no value (console DEBUG), a LEVEL (console level) or LEVEL FILE (adds a file output), and may repeat. Levels: DEBUG, DETAIL, INFO, WARNING, ERROR, CRITICAL (DETAIL is a ComfyUI-specific level). Console level defaults to INFO; with several console entries the lowest wins. Each LEVEL FILE adds a logging.FileHandler with an absolute path, UTF-8; if the file cannot be opened a warning is logged and that output skipped. Example: --verbose INFO --verbose DETAIL comfyui_detail.log (inference from parser). --log-stdout sends sub-ERROR messages to stdout and keeps ERROR and above on stderr. Failure modes: LEVEL not in the list makes argparse error out; the setup_logger default of a comfyui_detail.log file only applies when file_outputs is None, whereas main.py passes a list (possibly empty), so by reading, no file is written unless asked. Limitations: no rotation handler is used. Version: fb3befd.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: Reading of code only; behaviour of main.py's empty-list case was inferred and not run.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/comfy/cli_args.py","note":"VerboseAction; --verbose argument; VerboseAction.__call__; --log-stdout argument; setup_logger; setup_logger; researcher reasoning"},{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/app/logger.py","note":"VerboseAction; --verbose argument; VerboseAction.__call__; --log-stdout argument; setup_logger; setup_logger; researcher reasoning"}]},"categories":["T08"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/comfy/cli_args.py","claim":"Problem: capturing diagnostics from headless ComfyUI. Conditions: fb3befd. Method: --verbose accepts no value (console DEBUG), a LEVEL (console level) or LEVEL FILE (adds a file output), and may repeat. Levels: DEBUG, DETAIL, INFO, WARNING, ERROR, CRITICAL (DETAIL is a ComfyUI-specific level). Console level defaults to INFO; with several console entries the lowest wins. Each LEVEL FILE adds a logging.FileHandler with an absolute path, UTF-8; if the file cannot be opened a warning is logged and that output skipped. Example: --verbose INFO --verbose DETAIL comfyui_detail.log (inference from parser). --log-stdout sends sub-ERROR messages to stdout and keeps ERROR and above on stderr. Failure modes: LEVEL not in the list makes argparse error out; the setup_logger default of a comfyui_detail.log file only applies when file_outputs is None, whereas main.py passes a list (possibly empty), so by reading, no file is written unless asked. Limitations: no rotation handler is used. 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Conditions: fb3befd. Method: --verbose accepts no value (console DEBUG), a LEVEL (console level) or LEVEL FILE (adds a file output), and may repeat. Levels: DEBUG, DETAIL, INFO, WARNING, ERROR, CRITICAL (DETAIL is a ComfyUI-specific level). Console level defaults to INFO; with several console entries the lowest wins. Each LEVEL FILE adds a logging.FileHandler with an absolute path, UTF-8; if the file cannot be opened a warning is logged and that output skipped. Example: --verbose INFO --verbose DETAIL comfyui_detail.log (inference from parser). --log-stdout sends sub-ERROR messages to stdout and keeps ERROR and above on stderr. Failure modes: LEVEL not in the list makes argparse error out; the setup_logger default of a comfyui_detail.log file only applies when file_outputs is None, whereas main.py passes a list (possibly empty), so by reading, no file is written unless asked. Limitations: no rotation handler is used. Version: fb3befd.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: Reading of code only; behaviour of main.py's empty-list case was inferred and not run.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/comfy/cli_args.py","note":"VerboseAction; --verbose argument; VerboseAction.__call__; --log-stdout argument; setup_logger; setup_logger; researcher reasoning"},{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/app/logger.py","note":"VerboseAction; --verbose argument; VerboseAction.__call__; --log-stdout argument; setup_logger; setup_logger; researcher reasoning"}]},"tags":[],"type":"article","links":[],"title":"How do I set ComfyUI logging levels and write a log file with --verbose and --log-stdout?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Problem: capturing diagnostics from headless ComfyUI. Conditions: fb3befd. Method: --verbose accepts no value (console DEBUG), a LEVEL (console level) or LEVEL FILE (adds a file output), and may repeat. Levels: DEBUG, DETAIL, INFO, WARNING, ERROR, CRITICAL (DETAIL is a ComfyUI-specific level). Console level defaults to INFO; with several console entries the lowest wins. Each LEVEL FILE adds a logging.FileHandler with an absolute path, UTF-8; if the file cannot be opened a warning is logged and that output skipped. Example: --verbose INFO --verbose DETAIL comfyui_detail.log (inference from parser). --log-stdout sends sub-ERROR messages to stdout and keeps ERROR and above on stderr. Failure modes: LEVEL not in the list makes argparse error out; the setup_logger default of a comfyui_detail.log file only applies when file_outputs is None, whereas main.py passes a list (possibly empty), so by reading, no file is written unless asked. Limitations: no rotation handler is used. Version: fb3...","evidence":{"claims":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/comfy/cli_args.py","claim":"Problem: capturing diagnostics from headless ComfyUI. Conditions: fb3befd. Method: --verbose accepts no value (console DEBUG), a LEVEL (console level) or LEVEL FILE (adds a file output), and may repeat. Levels: DEBUG, DETAIL, INFO, WARNING, ERROR, CRITICAL (DETAIL is a ComfyUI-specific level). Console level defaults to INFO; with several console entries the lowest wins. Each LEVEL FILE adds a logging.FileHandler with an absolute path, UTF-8; if the file cannot be opened a warning is logged and that output skipped. Example: --verbose INFO --verbose DETAIL comfyui_detail.log (inference from parser). --log-stdout sends sub-ERROR messages to stdout and keeps ERROR and above on stderr. Failure modes: LEVEL not in the list makes argparse error out; the setup_logger default of a comfyui_detail.log file only applies when file_outputs is None, whereas main.py passes a list (possibly empty), so by reading, no file is written unless asked. Limitations: no rotation handler is used. 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