How to design and deploy advanced multi-agent AI systems using Gemini on Google Cloud?

I am designing an advanced multi-agent AI system using Gemini on Google Cloud and would like guidance on best practices for architecture and deployment.

The system consists of multiple specialized agents such as:

- Planner Agent for task decomposition

- Executor Agent for tool usage and action execution

- Critic Agent for validation and self-reflection

- Memory component for short-term and long-term context

The agents collaborate to solve complex tasks autonomously using Gemini’s reasoning capabilities.

I am particularly looking for insights on:

1. Recommended multi-agent architecture patterns with Gemini

2. Orchestration and communication between agents

3. Tool calling and external API integration

4. Memory management and state persistence

5. Deployment strategies using Vertex AI / Agent Engine

6. Monitoring, reliability, and cost optimization in production

Any examples, documentation references, or real-world best practices would be greatly appreciated.

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