How to Run Gemini 3 on Agent Engine with ADK

If you're trying to deploy an ADK agent with Gemini 3 to Agent Engine and getting a 404 error, here's the fix. TL;DR Two ways to make it work: 1. adk deploy agent_engine command Pass a .env file containing GOOGLE_CLOUD_LOCATION=global via the --env_file flag. uv run adk deploy agent_engine \ --project=$PROJECT_ID \ --region=$LOCATION_ID \ --env_file=$ENV_FILE \ --display_name="Greeting Agent" \ sample_agent 2. Python script Add the following to the agent_engines.create parameters: remote_agent = agent_engines.create( agent_engine=root_agent, display_name="Greeting Agent", requirements=[...], env_vars={ "GOOGLE_CLOUD_LOCATION": "global", # ← set the global region }, ) Sample code Koichi73 / adk-gemini-3-in-agent-engine How to run ADK agents, including Gemini 3, on Agent Engine. Run Gemini 3 Series on ADK + Agent Engine A sample project for deploying ADK agents with Gemini 3 series models (e.g., gemini-3-flash-preview) to Agent Engine. To use Gemini 3 series on Agent Engine, you need to