The legacy callback crate carried two rewrites that have nothing to do with the
Logging contract: litellm_credential_name inheritance and the max_budget and
num_retries_per_request checks. Any later callback host would need them
unchanged, which is the smell the crate's AGENTS.md now names. They are now a
Preflight the driver in litellm-host-python runs on the keyword view begin
returned, before the host projects from it, supplied by python-bridge and passed
through run_legacy_call. The call order is unchanged (setup, deployment hook,
credentials, limits) and a rejection still fails the call as a host failure, so
the failure callbacks run as before. The preflight rewrites the adapter's own
copy in place, so no extra dict copy and no new lifecycle method
Co-authored-by: Yujong Lee <yujong@berri.ai>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
