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n8n AI Agent Fails to Call Tools Due to Missing Request Parameter

The n8n AI Agent has a known issue where it may fail to call tools even when instructed to do so. This can occur due to a missing `tool_choice` parameter in the model request, leading compatible providers to respond with prose instead of executing a tool. Debugging involves inspecting the execution trace, schema validation, tool messages, and memory persistence. A provider-free contract lab was developed to test safeguards, ensuring the agent handles cases with no tools, preserves explicit choices, and stops forcing tool calls after they appear in the message history. AI

IMPACT Addresses a specific technical challenge in integrating AI agents with tools, impacting developers using n8n for workflow automation.

RANK_REASON The item discusses a specific technical issue and debugging process for a software tool (n8n AI Agent), rather than a new model release or significant industry event.

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n8n AI Agent Fails to Call Tools Due to Missing Request Parameter

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  1. dev.to — LLM tag TIER_1 English(EN) · xn ·

    n8n AI Agent Not Calling Tools: The Request Contract Behind tool_choice

    <p>An n8n AI Agent can have tools connected, receive a system instruction that says “you must call the tool,” and still return prose without executing anything.</p> <p>The first diagnostic is not the final answer. It is the execution trace:</p> <ul> <li>if the Tool node never sta…