Does it support asynchronous tool testing?

Yes, the skill includes specialized patterns for testing async tool execution, including concurrency, timeouts, and task cancellation using pytest-asyncio.

Does it include standard MCP error codes?

Yes, it validates standard JSON-RPC error codes such as -32601 (Method not found), -32602 (Invalid params), and -32603 (Internal error).

What protocol does this skill help test?

It is specifically designed to test the JSON-RPC 2.0 protocol compliance as required by the Model Context Protocol (MCP) specification.

Can I use this for full integration testing?

Absolutely. It provides templates for testing the complete lifecycle, including tool listing, resource reading, and end-to-end request/response cycles.

How does it handle Pydantic schema validation?

It implements strict mode validation to prevent implicit type coercion, ensuring that tool inputs and outputs strictly match the defined JSON schema.

MCP Protocol Compliance Testing

Name: MCP Protocol Compliance Testing
Author: Agentient

byAgentient

Security & Testing

Validates MCP servers for JSON-RPC 2.0 compliance and Pydantic schema integrity using standardized testing patterns.

About

This skill provides a comprehensive suite of testing patterns and Pydantic validations designed to ensure Model Context Protocol (MCP) servers adhere strictly to JSON-RPC 2.0 standards. It enables developers to proactively verify tool schemas, async execution flows, and error handling responses, facilitating the creation of robust, interoperable AI tools that function reliably within the MCP ecosystem. By leveraging strict mode validation and specialized Pytest fixtures, it helps eliminate common integration bugs before deployment.

Key Features

Asyncio-based testing for concurrent tool execution and timeouts
JSON-RPC 2.0 message structure and protocol validation
0 GitHub stars
Strict Pydantic schema enforcement for tool inputs and outputs
Pre-configured Pytest fixtures for server and client initialization
Standardized error code verification for MCP-compliant responses

Use Cases

Writing comprehensive unit and integration tests for new MCP server implementations
Debugging complex async tool behaviors like execution cancellation and resource reading
Verifying protocol compliance and schema strictness during CI/CD pipelines

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add agentient/vibekit mcp-protocol-compliance-testing

For use in Claude.ai and ChatGPT

Download Skill

GitHub