Tracing Google ADK Agents on Vertex AI Agent Engine, and the Five Gotchas Nobody Warns You About

enable_tracing=True is one line. Getting spans to actually show up involves a different API than you expect, a silent 403, and an env var the SDK overwrites behind your back.

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Not every AI feature needs an agent

Why my WhatsApp assistant uses a workflow, with the same task built both ways and compared through real model traces.