- Move embedded bash script to scripts/upload-attachment.sh - Update SKILL.md to reference external script with usage examples - Follows skill best practice: separate reusable tools from documentation
- Add MCP tools reference with actual tool names - Document Unix timestamp requirement for dates - Add complete table schemas for all 8 tables - Add key account IDs quick reference - Add step-by-step workflows for bill entry, payments, owner reimbursements - Add batch operations guidance for efficient multi-record entry - Add common SQL queries for reporting - Add validation checklist and expanded common mistakes