Keyword search picks the right tool for an AI agent 21% of the time. The router we built picks it 88% of the time, while cutting the tokens spent describing those tools by 99.6% . This is how we got there, including the parts we got wrong first. Architecture: Link The problem nobody talks about until the bill shows up Model Context Protocol (MCP) solved a real problem. It gave every AI agent a standard way to talk to external tools: CRMs, observability stacks, email, ve...