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RzNmKXandGitHub d861a3d52a fix(ai): Bedrock thinking signature and tool_choice errors (#333 )

* fix: strip invalid thinking signatures from aborted/errored messages

When a stream is interrupted mid-response, thinking blocks may have
empty or partial cryptographic signatures. These get persisted to
session history and sent on the next API call, causing:
'Invalid signature in thinking block'

transformMessages() now detects aborted/errored assistant messages and
clears thinkingSignature fields so they are treated as unsigned thinking
(converted to text by the serializer).

Also protect truncateForPersistence from corrupting signatures — clear
them entirely instead of truncating, since a partial signature is always
invalid.

* fix: disable thinking when tool_choice forces tool use on Bedrock

Bedrock rejects requests that combine extended thinking with forced
tool_choice (any or specific tool). The Anthropic provider already had
a guard (disableThinkingIfToolChoiceForced) but the Bedrock provider
was missing the equivalent check.

Also fix thinking block serialization: when a thinking block has no
valid signature (e.g., from an aborted stream), convert it to plain
text instead of sending it as reasoningContent without a signature.
The API requires the signature field on all reasoning blocks for models
that support it.

Add thinking block diagnostics to error messages for signature/thinking
related failures to aid debugging.

2026-03-09 15:02:19 +01:00