Slay the Spire 2

Slay the Spire 2 (PC, 2026) has code that decompiles almost back to source, Alchyr/BaseLib-StS2, and 6 other public projects, including an open-source reimplementation. An agent environment already wraps it.

Data checked 2026-10-13 · unbaked registry

Godot

Projects

STS2MCP (REST API + MCP server exposing full game state/actions)

Agent environmentC# mod DLL (platform-agnostic .NET) + Python MCP server512 starspushed 2026-07-29MIT licenserelease 0.4.0

Full agentic runs for Slay the Spire 2. A mod that exposes in-game state, and the MCP server for the mod.

GitHub

StS2 modding (Godot 4 .NET; sts2.dll decompilable; BaseLib + ModTempl…

Readable bytecodeGodot 4 (Mono/.NET build), C# net9.0 assemblies; ILSpy/dnSpy; Harmony…456 starspushed 2026-10-07MIT licenserelease v3.4.7

Mod for Slay the Spire 2 to standardize content additions

Early Access (Steam app 2868840); active modding scene; official mod loading with consent dialog; GitHub

Slay the Spire 2 (Android)

Readable bytecode365 starspushed 2026-04-06MIT licenserelease 0.2.0

An unofficial Android launcher for Slay the Spire 2. Alpha builds can be found on the Cinderbox Discord server.

status alpha

STS2-Agent (in-game AI companion + HTTP API + MCP)

Agent environmentC# mod + MCP server337 starspushed 2026-10-07custom licenserelease v0.16.2

杀戮尖塔2的MOD，将杀戮尖塔2的游戏状态与操作暴露为本地 HTTP API 包装成 MCP Server，供支持 MCP 的AI客户端直接调用

GitHub

AgenticSTS

Agent environmentSTS2 real-game testbed for LLM agent memory109 starspushed 2026-07-03custom license

Bounded, typed, ablatable memory contract for long-horizon LLM agents — Slay the Spire 2 testbed

(2026-07)

sts2-rl-agent (headless simulator)

ReimplementationPython headless simulator (577 cards, 260 powers, 121 monsters, 290 r…69 starspushed 2026-05-22no license

RL agent for Slay the Spire 2 — headless simulator + trained model + real game bridge

(2026-05)

Communication_Mod_STS2 (CommunicationMod-style live state export)

Agent environmentC# mod (requires BaseLib)0 starspushed 2026-05-06no license

A powerful API mod that exports the complete live game state of Slay the Spire 2 to a local server for AI training and bot development.

GitHub

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What you need

You need your own copy of the game: these projects ship code only.

Agent environments

Same toolchain

GameMethodYearStarsLast push

PCBrotatoReadable bytecodeAgent environment20236852026-09-03 PCBuckshot RouletteMatching decompReimplementation+32023512026-01-11 PCKnytt StoriesReimplementationReadable bytecode20071052026-08-05 PCPokéWildsSource releaseReadable bytecode2021272026-10-12 PCTiny CrateReadable bytecode20212392026-06-25 PCTowerJumperReadable bytecode1402019-12-20 PCPigeon AscentReadable bytecode2020632022-04-21 PCHunt for the Shadow RiderReadable bytecode292019-10-01

More on PC

GameMethodYearStarsLast push

PCMindustrySource releaseAgent environment201929k2026-10-11 PCosu!Source releaseReadable bytecode+1200719k2026-10-12 PCCommand & Conquer Remastered CollectionSource release202021k2025-01-16 PCRollerCoaster Tycoon 2ReimplementationAgent environment200216k2026-10-12 PCDune 2000Reimplementation199818k2026-10-11 PCAge of Empires IIReimplementation199914k2026-10-03 PCCataclysm: Dark Days AheadSource release201313k2026-10-12 PCCivilization VSource releaseReimplementation201011k2026-10-12

Found via Alchyr/ModTemplate-StS2, fresh-milkshake/Modding-Tutorial, store.steampowered.com/app/2868840/, kymie131.github.io/openportsgames/api/ports.json, Akirakato1/Slay-the-Spire-2-Simulator

GitHub data checked 2026-10-13. Notes are summaries from the research pass; the project pages are the authority.