cthomas 3d781efd21 fix(core): raise LLMEmptyResponseError for empty Anthropic responses (#9624) ...

* fix(core): raise LLMEmptyResponseError for empty Anthropic responses

Fixes LET-7679: Opus 4.6 occasionally returns empty responses (no content
and no tool calls), causing silent failures with stop_reason=end_turn.

Changes:
- Add LLMEmptyResponseError class (subclass of LLMServerError)
- Raise error in anthropic_client for empty non-streaming responses
- Raise error in anthropic_streaming_interface for empty streaming responses
- Pass through LLMError instances in handle_llm_error to preserve specific types
- Add test for empty streaming response detection

This allows clients (letta-code) to catch this specific error and implement
retry logic with cache-busting modifications.

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

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

* fix(core): set invalid_llm_response stop reason for empty responses

Catch LLMEmptyResponseError specifically and set stop_reason to
invalid_llm_response instead of llm_api_error. This allows clients
to distinguish empty responses from transient API errors.

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

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

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

2026-03-03 18:34:01 -08:00

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