What hidden maintenance costs come with DIY AI agent infrastructure?

DIY AI agent infrastructure can look inexpensive at first, but maintenance costs appear in recovery logic, state handling, retries, observability, identity, access policy, audit trails, deployment automation, and security review evidence. Each team may build slightly different patterns, making it harder for platform teams to support agents consistently. DIY also creates risk when a prototype grows into production faster than expected. The build-versus-buy question should include not only engineering time, but also operational burden, incident response, and governance overhead. Diagrid Catalyst is positioned for teams that want shared production infrastructure instead of repeated custom plumbing.