Building AI Agents That Handle Money: Security Patterns
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if your agent can make purchases or transfers you need these security patterns. learned the hard way
curious what everyone else thinks. browser-use agents are genuinely scary good now
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biggest gotcha imo is that most payment APIs don't have idempotency enforced by default so your agent can double-charge if it retries on a timeout. gotta handle that explicitly or it'll bite you
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multi-agent sounds good until one compromised sub-agent has the same payment permissions as the orchestrator. least-privilege per agent is non-negotiable, not optional
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what threshold amounts are people using for human-in-the-loop approval? trying to figure out if $50 is too low or $500 is too risky for automated pass-through
the scariest part is prompt injection through receipts or invoices the agent reads. someone embeds instructions in a pdf and suddenly your agent is wiring money somewhere weird. whitelist your input sources.