Praefectus — Dota 2 Draft Assistant

A desktop application that helps with hero drafting in Dota 2, providing real-time counter-pick recommendations, team synergy analysis, and a tier list based on current meta statistics.

Built with Kotlin + Compose Desktop, powered by STRATZ GraphQL API.

Features

• Smart Draft Recommendations — suggests optimal picks based on counter-matchups, team synergies, and current meta winrates
• All Pick & Captains Mode — supports both draft formats with full pick/ban phase tracking
• Tier List — auto-generated hero rankings by role, filterable by rank bracket
• Team Synergy Analysis — evaluates how well your team composition works together
• Rank Bracket Filter — statistics tailored to your MMR range (Herald to Immortal)
• Bilingual UI — Russian and English interface

Screenshots

Tech Stack

Layer	Technology
Language	Kotlin 2.x (JDK 25)
UI	Compose Desktop (JetBrains)
Build	Gradle 9.2 (Kotlin DSL)
HTTP	Ktor Client
Data	STRATZ GraphQL API
Cache	SQLite + Exposed ORM
Async	Kotlin Coroutines + Flow

Getting Started

Prerequisites

• JDK 25+
• STRATZ API token (get one here)

Run

./gradlew run

On first launch, the app will ask for your STRATZ API token.

How This Project Was Built

This project was developed collaboratively with AI (Claude by Anthropic). The process:

1. Prompt engineering — I designed a detailed specification covering architecture, data sources, algorithms, and UI requirements
2. Code generation — Claude Code generated the initial codebase from the prompt
3. Iteration & refinement — I reviewed, tested, and refined the code manually

The original prompt that generated v1 of this project is available in prompts/initial-prompt.md. I believe transparency about AI-assisted development is important — it shows the ability to effectively collaborate with AI tools, which is a valuable modern engineering skill.

Architecture

me.anlear.praefectus/
├── data/          # API client, cache, repositories
├── domain/        # Draft engine, recommendation algorithm
├── ui/            # Compose Desktop screens & components
└── util/          # Config, localization

Draft Score Algorithm:

Score(hero) = Σ(vs_enemy_advantage) × 1.5
            + Σ(with_ally_synergy)  × 1.0
            + (meta_winrate - 50%)  × 0.5

Roadmap

• v1: Draft recommendations, counter-picks, synergies, tier list
• v2: Item build recommendations based on draft composition
• v2: Personal stats integration (your hero pool & winrates)
• v3: Real-time draft tracking via Dota 2 GSI

License

This project is licensed under the AGPL License — see the LICENSE file for details.

Acknowledgments

• STRATZ — Dota 2 statistics API
• Valve — hero icons and game data