[PierrunoYT]

Fixes #2064

Problem

LiteLLM carries a Gemini thought signature inside the tool call id (call_xxx__thought__<signature>). The LiteLLM handler ran every tool call id through sanitizeOpenAiCallId, which truncates to 64 characters and appends _ + an 8-hex hash. For these ids that cut the signature and added the hash, so Gemini rejected the next request with 400 ... thought_signature ... Base64 decoding failed.

Fix

New sanitizeLiteLlmCallId (utils/tool-id.ts): ids containing __thought__ are only character-sanitized (never truncated); all other ids keep the existing OpenAI 64-character treatment. LiteLLMHandler uses it for both the standard and the R1-format message conversion.

Notes

• Gemini through LiteLLM does not need the 64-character limit for these ids; the ids stay as LiteLLM generated them.
• A history that mixes a long thought-signature id with a provider that enforces 64 characters is not specially handled (same as before for non-LiteLLM providers).

Tests

tool-id.spec.ts (intact long id, invalid-character sanitizing, other long ids still truncated, short ids unchanged) and a lite-llm.spec.ts test that the assistant tool_calls[].id and the tool message tool_call_id reach the request unchanged. check-types passes.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 16425bc and b018630.

📒 Files selected for processing: 4

• src/api/providers/__tests__/lite-llm.spec.ts
• src/api/providers/lite-llm.ts
• src/utils/__tests__/tool-id.spec.ts
• src/utils/tool-id.ts

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