> For AI agents: the complete documentation index is available at https://mfeflow.github.io/mfeflow/llms.txt, the full documentation bundle is available at https://mfeflow.github.io/mfeflow/llms-full.txt.

# MFEFLOW_E403

The registry's index.json is not valid.

## Fix

Ask the registry owner to rebuild it with `mfeflow registry build`. It lists items with a name, version and description.