Recap

In the previous two articles of this series:

" [Agent Platform in Action (1)] Building a LINE AI Business Card King with Go and Google ADK 2.0 Graph Workflow " : We used google.golang.org/adk/v2/workflow to implement a 12-node business card assistant featuring a Deterministic Router , AddFanOut / AddFanIn three-way parallel background checks , and NewRequestInputEvent Human-in-the-Loop (HITL) pause and loop correction .

" [Agent Platform in Action (2)] From Monolithic Cloud Run to Google Cloud Agent Runtime: Refactoring LINE AI Business Card King with agents-cli and ADK Go " : We introduced the agents-cli official development lifecycle, explained the Agent Runtime's Scale-to-Zero mechanism, and completed Phase 1 ( PR #10 ) , transforming the project into a standard adk_go dual-channel architecture supporting LINE Webhook, ADK WebUI Playground, and A2A protocols.

Entering Phase 2 ( Issue #3 & Issue #4 ) , we face a classic and common pitfall in distributed systems when pushing to production (Cloud…