Kian Jones 82e5d70807 fix: prevent empty reasoning messages in streaming interfaces (#7207) ...

* fix: prevent empty reasoning messages in streaming interfaces

Prevents empty "Thinking..." indicators from appearing in clients by
filtering out reasoning messages with no content at the source.

Changes:
- Gemini: Don't emit ReasoningMessage when only thought_signature exists
- Gemini: Only emit reasoning content if text is non-empty
- Anthropic: Don't emit ReasoningMessage for BetaSignatureDelta
- Anthropic: Only emit reasoning content if thinking text is non-empty

This fixes the issue where providers send signature metadata before
actual thinking content, causing empty reasoning blocks to appear
in the UI after responses complete.

Affects: Gemini reasoning, Anthropic extended thinking

👾 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta <noreply@letta.com>

* fix: handle Anthropic thinking signature correctly

- Only include 'signature' in Anthropic message payload if it is not None (fixes BadRequestError).
- Capture and attach 'signature' to ReasoningMessage in streaming interface.

* fix(anthropic): attach signature to last reasoning message in stream

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Co-authored-by: Letta <noreply@letta.com>

2026-01-12 10:57:19 -08:00

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