Closes the reasoning gaps left open by the normalization work.
Reasoning replay. The coercer dropped Anthropic thinking-block signatures and
the Responses handler dropped reasoning item ids/encrypted_content, so a
normalized reasoning turn could not be replayed — Anthropic rejects an
extended-thinking tool-use continuation whose thinking blocks lost their
signature. Both now ride `message.reasoning_details` verbatim, and both input
paths accept them back: ClaudeProvider splices the blocks ahead of the content
(Anthropic requires them to lead), and the Responses input processor expands
them into standalone `reasoning` items. Output-only fields a replayed message
carries (`reasoning`, `refusal`, `normalized`) are stripped on both paths,
since neither upstream accepts them. The docs caveat recommending
`normalize: false` for agentic Claude loops is gone; it is no longer true.
Unmapped stop reasons. chatresponse.md promised a vendor `finish_reason` with
no OpenAI analog "passes through unchanged" — true for the Mistral remap, false
for the Anthropic coercer, which discarded it. Anthropic's `pause_turn` means
"continue this turn", so flattening it to `stop` destroyed the signal. The
coercer now passes unmapped values through verbatim, matching both the doc and
the Mistral path, and the docs gain the full Anthropic stop-reason table.
Reasoning summaries. Multi-part summaries joined with '' instead of a blank
line, and the streaming Responses path emitted no reasoning at all;
`response.reasoning_summary_text.delta` now feeds the same `reasoning` stream
channel the chat-completions handler uses.
Types. `text?: string & { verbosity?: ... }` was an uninhabitable intersection
(providers read `text?.verbosity` as an object), and the verbosity enum was
`'concise' | 'detailed'` where OpenAI accepts `'low' | 'medium' | 'high'`.
Adds `reasoning`, `reasoning_details`, and `refusal` to the SDK ChatMessage
typedef.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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