List the existing keyscale vocabulary in the expansion tool schema.
Keep optional keys omitted when unspecified and retain server validation.
Quote rejected keys in validation errors, with a bounded prefix, so a
failed request exposes the invalid notation without other arguments.
Assisted-by: nib:gpt-6.1-sol
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>