A developer builds an MCP server that provides a search tool. The search tool returns results with URLs.…

Question

A developer builds an MCP server that provides a search tool. The search tool returns results with URLs. After deployment, they notice Claude sometimes fabricates URLs that look similar to real results but don't exist. What server-side measures prevent this?

Accepted Answer

B. Use context awareness (citations) to track which URLs come from tool results vs. model generation

Answer

A. Add URL validation in the system prompt instructing Claude to only use URLs from tool results

Answer

C. Implement client-side URL validation that checks all URLs in Claude's response

Answer

D. Return URLs as structured data in tool results (not embedded in text) and instruct Claude to reference results by ID rather than regenerating URLs

Question 279