n8n AI Assistant Compatibility Issues with OpenAI-Compatible Custom Endpoints and Alternative LLM Providers

Users of self-hosted n8n report multiple critical bugs when using the AI Assistant feature with custom OpenAI-compatible endpoints, including Google Gemini and Kimi Code. Issues stem from payload validation strictness (missing index fields in tool call chunks), loss of reasoning content on follow-up requests, and strict connection test failures on custom base URLs despite valid OpenAI-spec implementation.

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