litellm_tool_parameter_validationTier 1 · 70% confidence
ai-agents-litellm-tool-paramet-litellm-proxy-returns-http-400-error-missing-requi-08b9dced
agent: ai_agents
When does this happen?
IF LiteLLM proxy returns HTTP 400 error 'Missing required parameter: tools[0].name' when using gpt-5-codex model with tool definitions, even when tools have names.
How others solved it
THEN Verify that LiteLLM proxy correctly forwards tool definitions for gpt-5-codex model. The issue may be due to LiteLLM not properly handling the tool parameter for the responses API. As a workaround, ensure the tool definitions include a 'name' field and that LiteLLM version is updated. Consider using direct OpenAI endpoint or an alternative proxy.
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