Manual microservice onboarding in GitOps is complex, time-consuming and prone to errors. GitLab Duo Agent Platform addresses this with custom AI agents. The tutorial demonstrates building an agent to onboard a TanukiBank microservice. The process involves defining the application's GitOps workflow. First, a system prompt is generated using GitLab Duo to understand the existing setup. Then, a custom agent is created within GitLab, incorporating the system prompt and tools. A new microservice is built using the Developer flow. The custom agent is then instructed to onboard the new service. The Agent updates manifests, pipelines and creates merge requests with approval. Deployments are verified, confirming the microservice is live. The benefits include time savings, knowledge capture, and controlled access. This results in consistent and auditable changes, offering the speed of automation with enterprise control.