mcp-assert
Active·★ 26·MIT·Updated 2026-10-21
mcp-assert is a powerful tool designed to test MCP (Multi-Agent Communication Protocol) servers against the real protocol, eliminating the need for mocks or language-specific dependencies. It validates server responses against YAML-defined expectations, ensuring compatibility with all MCP clients.
#MCP Protocol#API Testing#Server Testing#CI/CD#Assertions#Dev Tooling#Go
01
Features
01Protocol-level testing without mocks: Connects to servers using real stdio/SSE/HTTP transport and full MCP handshake.
02YAML-driven assertions: Define expectations in YAML for deterministic output validation.
03Language and framework agnostic: Tests any MCP server regardless of its implementation language and integrates with various test runners (Vitest, pytest, etc.).
04Comprehensive audit and fuzzing: Automatically scans servers, classifies tool health, and throws adversarial inputs to find crashes.
02
Compatibility
MCP Protocol
Protocol
Verified via docs
Go
Runtime
Verified via docs
Python
Integration
Verified via docs
JavaScript/TypeScript
Integration
Verified via docs
Operating Systems
Platform
Verified via docs
03
Quick start
1
$ pip install mcp-assert
04
Use cases
↳Validate MCP server compliance: Ensure your MCP server works with every MCP client by testing against the real protocol.
↳Integrate into CI/CD pipelines: Automate testing with GitHub Actions, regression detection, and JUnit XML reports.
↳Discover hidden bugs in MCP implementations: Find issues that traditional unit tests miss by testing over the wire.
↳Rapid server auditing: Quickly audit any MCP server in seconds to check tool health and schema issues without extensive setup.
05
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