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You are building a customer support resolution agent using the Claude Agent SDK.

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You are building a customer support resolution agent using the Claude Agent SDK. The agent handles high-ambiguity requests like returns, billing disputes, and account issues. It has access to your backend systems through custom Model Context Protocol (MCP) tools ( get_customer , lookup_order , process_refund , escalate_to_human ). Your target is 80%+ first-contact resolution while knowing when to escalate.

During testing, you find that when a customer says “I need a refund for my recent purchase,” the agent calls process_refund immediately—but populates the required order_id parameter with a plausible-looking but fabricated value instead of first calling lookup_order to retrieve the actual order ID. The refund call fails because the fabricated ID doesn’t exist.

Which change directly addresses the root cause of the agent fabricating the order_id value?

A.

Update the process_refund tool description to explicitly state that order_id must be obtained from a prior lookup_order call and must never be assumed or invented.

B.

Switch tool_choice from "auto" to "any" to force the agent to make a tool call on every turn.

C.

Add server-side validation that checks whether the order_id exists in your database before executing the refund, returning an error to the agent if not found.

D.

Pre-parse incoming customer messages to extract any order IDs mentioned, and inject them into the conversation context before passing to Claude.

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