fastapi_mcp
★ 12.0k
vs
chiasmus
★ 218
fastapi_mcp vs chiasmus
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.; chiasmus: Chiasmus is an MCP server that integrates formal verification (Z3, Prolog) and code analysis (tree-sitter) to solve complex logical and structural problems. It translates natural language into formal logic using templates and provides verified results. It also analyzes source code call graphs for dead code, impact, and reachability.
01
TL;DR
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).
chiasmusDev Tooling · ★ 218
Detect conflicts in access control rules
02
Side-by-Side Comparison
03
Features
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
chiasmus01Formal verification via Z3 SMT solver and Tau Prolog
02Tree-sitter-based source code analysis
03Template-based problem formalization
04End-to-end solving pipeline
05Custom language adapters
04
Use Cases
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.
chiasmus↳Detect conflicts in access control rules
↳Find dead code and perform impact analysis
↳Verify software invariants and state machines
05
Best For
fastapi_mcpMost PopularEssential
chiasmus—
FAQ
FAQ
What is the difference between fastapi_mcp and chiasmus?
Both fastapi_mcp and chiasmus are in the Dev Tooling category. fastapi_mcp has 12.0k stars, while chiasmus has 218 stars.
Which is better, fastapi_mcp or chiasmus?
The best choice depends on your use case. Choose fastapi_mcp if Integrating FastAPI services as tools for large language models (LLMs) that support MCP., and chiasmus if Detect conflicts in access control rules.
Is fastapi_mcp free or open source?
Yes, fastapi_mcp is open source on GitHub (MIT).
Is chiasmus free or open source?
Yes, chiasmus is open source on GitHub (Apache-2.0).
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