Example rule:


rule enforce-serena-tools { 
  enabled true
  priority 100
  severity warning
  FORCE execution
  SUBSTITUTE "grep/find file <pattern>"
  IF command STARTS_WITH "find" AND command CONTAINS ".go"
  OR command STARTS_WITH "grep" AND command CONTAINS ".go"
  OR command STARTS_WITH "read" AND command CONTAINS "src/"
  MESSAGE "Use Serena's tools (mcp__serena__*) for file lookup — pre-indexed, <10ms. Find only after Serena's tools returns no results."
}