---
title: "Build Better AI Agents: 5 Developer Tips from the Agent Bake-Off"
description: "The Google Cloud AI Agent Bake-Off is presented as a test of building autonomous agents under severe time constraints for e-commerce, banking modernization, and startup go-to-market problems. Its five patterns recommend decomposing monolithic prompts into specialized sub-agents under a supervisor, designing modularly because model capabilities can quickly replace custom harnesses, and treating multimodality as native. It also advocates open protocols—including MCP, A2A, UCP, AP2, A2UI, and AG-UI—for agent and tool connections instead of bespoke wrappers. Finally, it separates probabilistic reasoning from execution: strict JSON schemas such as Pydantic validate LLM outputs before deterministic Python functions or SQL perform calculations and writes. The stated conclusion is that reliable production agents depend on rigorous software architecture rather than elaborate prompts or flashy single-shot demos."
---

# Build Better AI Agents: 5 Developer Tips from the Agent Bake-Off

[Google](https://yomu.fyi/company/google) · Frank Guan, Abraham Gomez · Apr 14, 2026

**Type:** Tutorial

## Summary

The Google Cloud AI Agent Bake-Off is presented as a test of building autonomous agents under severe time constraints for e-commerce, banking modernization, and startup go-to-market problems. Its five patterns recommend decomposing monolithic prompts into specialized sub-agents under a supervisor, designing modularly because model capabilities can quickly replace custom harnesses, and treating multimodality as native. It also advocates open protocols—including MCP, A2A, UCP, AP2, A2UI, and AG-UI—for agent and tool connections instead of bespoke wrappers. Finally, it separates probabilistic reasoning from execution: strict JSON schemas such as Pydantic validate LLM outputs before deterministic Python functions or SQL perform calculations and writes. The stated conclusion is that reliable production agents depend on rigorous software architecture rather than elaborate prompts or flashy single-shot demos.

## Context

The work addresses the difficulty of moving from LLM demonstrations to reliable, production-ready autonomous agents. The Bake-Off examples exposed problems involving hallucinations, latency, rapidly changing model capabilities, limited text-only experiences, brittle integrations, and validation errors in financial calculations.

## Approach / What changed

The proposed approach combines specialized multi-agent workflows, modular agent harnesses, native multimodal models, open protocols such as MCP, and strict schemas separating LLM reasoning from deterministic execution. Python functions or SQL handle validated calculations and database writes, while agents manage intent extraction, routing, and tool use.

## Takeaways

- In Episode 3, tightly scoped agents running in parallel reduced processing time from 1 hour to 10 minutes.
- The virtual try-on pattern combines user photos, visual-context extraction, and image-generation tools instead of returning text-only recommendations.
- Pydantic-style JSON validation can gate LLM outputs before deterministic Python functions or SQL perform financial calculations and database writes.

**Tags:** [AI Agents](https://yomu.fyi/topic/ai-agents), [Architecture](https://yomu.fyi/topic/architecture), [MCP](https://yomu.fyi/topic/mcp), [Multimodal](https://yomu.fyi/topic/multimodal), [Python](https://yomu.fyi/topic/python)

- Source: [Google](https://developers.googleblog.com/build-better-ai-agents-5-developer-tips-from-the-agent-bake-off)
- Source URL: https://developers.googleblog.com/build-better-ai-agents-5-developer-tips-from-the-agent-bake-off
- Ingested by Yomu: 2026-09-09T14:30:06.010Z

[Read original post](https://developers.googleblog.com/build-better-ai-agents-5-developer-tips-from-the-agent-bake-off)