Building "Captain Cool"

Sarthak Patil — Sun, 17 May 2026 12:18:19 +0000

Building "Captain Cool": A Multi-Agent IPL Strategist Powered by Google Gemini in 3 Hours

Cricket is a captain's game. But what if the captain was an autonomous, multi-agent AI "Brain Room" analyzing live weather, pitch soil, and historical matchups in real-time?

This weekend, I participated in the Agentic Premier League (APL) Hackathon organized by the incredible team at #gdgcloudpune. The challenge? Build an agentic AI system that acts as a virtual IPL captain—making tactical decisions under pressure exactly like Dhoni, Rohit, or Hardik. And the golden rule: It had to be built entirely on the Google Gemini ecosystem within a grueling 3-hour window.

Here is a deep dive into how I built Captain Cool 🏆.

🌟 The Problem: Moving Beyond the "Chatbot"

When building an AI for sports strategy, a generic LLM wrapper won't cut it. If you ask a standard chatbot, "Who should bowl the next over?", it will give you generic advice.

Real cricket requires context: Is dew setting in? Is the wind blowing toward the short boundary? Is it a red soil or black soil pitch?

Captain Cool solves this by moving away from a single prompt and utilizing an adversarial multi-agent architecture. You input the current match state, and the system replies with:

🎯 The Next Decision (e.g., bowling changes, field setups, Impact Player usage).
🧠 The Reasoning (explained in authentic commentator language).
⚔️ The Internal Debate (a raw, unedited back-and-forth between specialized agents).

🏗️ Architecture: Inside the "Brain Room"

To achieve this, I used Google's Agent Development Kit (ADK) and the @google/genai SDK to create three distinct, named agents powered by gemini-2.5-pro. They don't just generate text; they debate.

The Agent Lineup

🔬 The Head Analyst: The data purist. Grounds proposals strictly in match history, player matchups, boundary dimensions, and venue run-rates. Proposes the initial tactical move based on max-probability outcomes.
😈 The Devil's Advocate: The risk-taker. Contrarian mindset focused on exploiting dew factors, pitch behavior, and psychological pressure. Aggressively challenges the Analyst’s every move.
👑 The Virtual Captain: The pragmatic leader. Synthesizes the debate, weighs resources (like remaining overs), evaluates the game phase, and delivers the final, definitive decision.

The Debate Flow

Match State Input 2. Analyst proposes a move.
Devil's Advocate challenges and counters.
Virtual Captain evaluates the conflict and makes the final call.
The UI renders the fan-friendly commentary output alongside the raw debate log.

🌪️ Innovation: Real-Time Agentic Tooling

An AI is only as good as its data. To elevate Captain Cool, I equipped the agents with real-time API tools using Gemini Native Function Calling:

Micro-Climate & Dew Prediction Engine: The Devil's Advocate uses a Weather API to fetch live dew points, humidity, and wind speed. If humidity crosses 75% at a coastal venue like Chepauk, the agent dynamically calculates a "grip loss percentage" and forces the Captain to hold back spin bowlers due to a wet ball.
Geospatial Stadium & Pitch Analytics: The Head Analyst uses a venue database to map boundary dimensions and pitch soil profiles. If the wind is blowing towards a short 60m boundary at Chinnaswamy, the agent explicitly restricts bowling into the wind and suggests specific field placements (like a deep point) to protect the vulnerability.

These tools guarantee the debate is mathematically grounded in the actual physics of the current match.

🔒 The Stack: Dual-Layer Auth & Modern Web

The platform isn't just a backend script; it’s a fully realized web application with a sleek, monochromatic glassmorphism UI.

Authentication: I implemented a Dual-Layer Auth Gateway converging Web3 and Web2:

🦊 Web3: MetaMask (window.ethereum) handshake for decentralized identity.
🔥 Web2: Firebase Auth for classic Email/Password access.

Users configure their own Gemini API key via a secure settings dashboard, ensuring keys are safely held in the application state and never logged to the client console.

Tech Stack Breakdown:

Frontend: React 19, Vite 8, Tailwind CSS 4, Framer Motion
Backend: Hono.js on Bun (for blistering fast API routes)
AI Orchestration: Google Gemini 2.5 Pro, Agent Development Kit (ADK)
IDE: Google Antigravity (Vibe-coded the entire session here!)

🎮 A Live Scenario Walkthrough

What does this look like in action? Let's say you input this state into the Brain Room:

Innings 2, Over 15.2, 42 runs needed off 28 balls. Big hitter on strike. Left-arm spinner has 1 over left. Dew is actively setting in. Venue: Wankhede.

The Debate Visualizer outputs:

🔬 The Head Analyst: "Brings on the left-arm orthodox spinner. Matchup data shows the batsman struggles with away spin."

😈 The Devil's Advocate: "Object. The ball is soaking wet due to heavy dew. The spinner will slip, lose control of length, and release pressure. Bring on the express pacer for cross-seam deliveries instead."

👑 The Virtual Captain: "Debate closed. We save the spinner for the long-boundary side later. The pacer bowls over the wicket, targeting hard lengths into the pitch."

🏅 Final Thoughts & Shoutouts

Building a multi-agent orchestrated system in just 3 hours was an absolute adrenaline rush. It proved to me that the future of AI development isn't just about crafting the perfect prompt; it's about building ecosystems where specialized AI models can reason, argue, and utilize tools autonomously.

A massive shoutout to ** @gdgcloudpune *, especially *@antrixsh_gupta *, *@pratik_kale **, and the entire organizing team. The problem statement was brilliant, the vibe was electric, and events like this push the developer community to level up in incredible ways.

Cricket is a captain's game. Now AI captains it too. 🏆

👇 Check out the code and try it yourself:

GitHub Repository: Precise-Goals/capcool
Tech: Google Gemini, React, Bun, Next.js, Firebase, Web3

Let me know in the comments what you think of multi-agent architectures or how you would have set the field for the final over! 🏏🔥

DEV Community: Sarthak Patil