STS2MCP
★ 526
vs
fastapi_mcp
★ 12.0k
STS2MCP vs fastapi_mcp
STS2MCP: STS2MCP is an experimental research mod for Slay the Spire 2 that enables AI agents to play the game. It exposes game state and actions via a localhost REST API, with an optional MCP server for Claude Desktop/Claude Code integration. It supports both singleplayer and multiplayer co-op, and has been tested against STS2 v0.99.1.; fastapi_mcp: FastAPI-MCP allows you to expose your existing FastAPI endpoints as Model Context Protocol (MCP) tools. It offers native integration with FastAPI, including built-in authentication using existing dependencies, and preserves schemas and documentation.
01
TL;DR
STS2MCPDev Tooling · ★ 526
AI agents autonomously playing Slay the Spire 2
fastapi_mcpDev Tooling · ★ 12.0k
When to choose:
- You already have a FastAPI application and want to expose its endpoints as MCP tools while reusing your existing FastAPI authentication dependencies and Swagger schemas.
- You want to mount the MCP server directly onto your ASGI app or deploy it separately under an MIT license.
When to skip:
- You are building a standalone MCP server from scratch rather than wrapping a FastAPI app; use FastMCP or the official MCP Python SDK.
- You need an actively updated repository (last push was November 2025).
02
Side-by-Side Comparison
Field
STS2MCPfastapi_mcpCategory
Dev Tooling
Dev Tooling
Stars
★ 526
★ 12.0k
License
MIT
MIT
Install Command
git clone https://github.com/Gennadiyev/STS2MCP.git
uv add fastapi-mcp
Updated
2mo ago
11mo ago
Open Source
Yes
Yes
Tags
agentic-ai, mcp-server, mcp-servers
FastAPI, MCP, Python
03
Features
STS2MCP01Exposes game state and actions via a localhost REST API
02Optional MCP server for Claude Desktop / Claude Code integration
03Supports singleplayer and multiplayer (co-op)
04Automatically starts HTTP server on localhost:15526
05Allows AI agents to fully automate game runs
fastapi_mcp01Authentication built in, using your existing FastAPI dependencies!
02FastAPI-native: Not just another OpenAPI -> MCP converter
03Zero/Minimal configuration required
04Preserving schemas of your request models and response models
05Flexible deployment - Mount your MCP server to the same app, or deploy separately
04
Use Cases
STS2MCP↳AI agents autonomously playing Slay the Spire 2
↳Collaborative human-AI co-op runs
↳Benchmarking AI reasoning and decision-making capabilities
fastapi_mcp↳Integrating FastAPI services as tools for large language models (LLMs) that support MCP.
↳Enabling LLMs to interact with and utilize existing business logic and data exposed via FastAPI.
↳Quickly exposing authenticated FastAPI APIs as discoverable and usable tools within an MCP ecosystem.
05
Best For
STS2MCP—
fastapi_mcpMost PopularEssential
FAQ
FAQ
What is the difference between STS2MCP and fastapi_mcp?
Both STS2MCP and fastapi_mcp are in the Dev Tooling category. STS2MCP has 526 stars, while fastapi_mcp has 12.0k stars.
Which is better, STS2MCP or fastapi_mcp?
The best choice depends on your use case. Choose STS2MCP if AI agents autonomously playing Slay the Spire 2, and fastapi_mcp if Integrating FastAPI services as tools for large language models (LLMs) that support MCP..
Is STS2MCP free or open source?
Yes, STS2MCP is open source on GitHub (MIT).
Is fastapi_mcp free or open source?
Yes, fastapi_mcp is open source on GitHub (MIT).
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