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Savanne Kham
258965663c
The 'tool_name' key on role=tool messages is an internal Hermes field (stored in the messages.tool_name SQLite column for FTS indexing) that is not part of the OpenAI Chat Completions schema. Strict OpenAI-compatible providers — notably Moonshot AI (Kimi) — reject it with HTTP 400: Error from provider: Extra inputs are not permitted, field: 'messages[N].tool_name', value: 'execute_code' Add 'tool_name' to the sanitize block in ChatCompletionsTransport.convert_messages alongside the existing Codex Responses API fields (codex_reasoning_items, codex_message_items) so it is popped before the request is sent. Reproducer: hermes chat --model kimi-k2.6 > list the top 5 Hacker News stories -> assistant emits tool_call(execute_code) -> tool result message gets tool_name='execute_code' -> next turn's payload includes messages[N].tool_name -> 400 Permissive backends (MiniMax, OpenRouter on most routes) ignore the extra field and were masking the bug.