Keep discriminator-specific schemas for known Anthropic blocks, content
deltas, and message deltas, while holding only the nested provider
payload opaque at the event boundary. Unknown discriminators are ignored;
recognized variants are processed only after strict decoding succeeds.
Malformed fields relevant to a known variant drop that block or delta;
malformed fields belonging to other variants are ignored. Envelope,
terminal, error, tool-input, and finish-reason behavior is unchanged.
Aiden Cline
b0716ae5d4