You can process all PDFs in a directory and output doctags using the docling CLI with the following command:

docling convert /path/to/your/pdf_directory --from pdf --to doctags --vlm-model GRANITEDOCLING --output /path/to/output_dir

This command will recursively process all PDFs in the specified directory and save .doctags files for each document in the output directory. The CLI handles batch processing and output automatically. For programmatic use, you can utilize the DocumentConverter class and its convert_all method, then call export_to_doctags() on each result. More details and example code are available in this discussion. Make sure to use the latest Granite Docling model to avoid known issues.