STS2 FAQs

Question 1

What is STS2?

Accepted Answer

STS2 is a mod for Slay the Spire 2 that allows AI agents to fully automate gameplay. It exposes the game's state and available actions through a localhost REST API, enabling external programs to control your runs.

Question 2

How does STS2 connect to AI models like Claude?

Accepted Answer

STS2 provides a localhost REST API for direct integration. Additionally, it offers optional MCP server integration for Claude Desktop and Claude Code, allowing seamless connection for LLM-based agents to interact with the game.

Question 3

Does STS2 support both singleplayer and multiplayer gameplay?

Accepted Answer

Yes, STS2 supports full automation of singleplayer runs across all game screens (combat, map, events, shop, etc.). It also includes beta support for multiplayer (co-op) runs, featuring end-turn voting, map node voting, and shared event participation for AI agents.

Question 4

Why would I use AI to play Slay the Spire 2?

Accepted Answer

STS2 is primarily an experimental research project. Its purpose is to test and benchmark AI models and agents in a complex, out-of-distribution domain like Slay the Spire 2, evaluating their reasoning and decision-making capabilities. It also supports co-op with AI.

Question 5

Is STS2 considered a cheat mod?

Accepted Answer

STS2 itself is an interface that allows external programs to interact with the game; it does not inherently alter gameplay mechanics. While it enables external control, whether it's used for 'cheating' depends on how you utilize this interface with your AI agents.

STS2

STS2

Key Features

Use Cases

Key Features

Use Cases