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091f3e3acd
The bridge dropped providerMetadata from content-block stream events,
so reasoning parts persisted as bare {type, text}. Anthropic thinking
signatures (which arrive on a reasoning-delta with an empty text delta),
Gemini thoughtSignatures (on text-end / reasoning-end / tool-call), and
OpenAI encrypted reasoning were all lost — breaking multi-step tool
turns whenever extended thinking is enabled, since providers require
signed blocks to be echoed back verbatim within the tool loop.
Now every -start event opens a new part (distinct blocks keep distinct
signatures) and metadata from each event of a block is merged opaquely
onto that part's providerOptions, which convertFromMessages already
echoes verbatim. The bridge never interprets the contents; each
provider reads back only its own keys. Empty blocks with no metadata
are dropped, matching the previous lazy-creation behavior. finish-step
metadata stays top-level as before.
Schemas already allowed providerOptions on all part types, so persisted
files remain readable in both directions.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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