Would you take a fixed price contract for your agents work?
A client offers $10,000 to migrate a service to a new framework: several hundred files, incomplete tests, undocumented behavior. Payment comes only when agreed acceptance criteria are met. The discussion lands on writing the criteria down before any file moves, pricing per milestone instead of one lump sum, and making the agent show before-and-after state for every criterion. If the client will not pin the criteria down, charge hourly or walk away.