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Build MCP (Model Context Protocol) servers that give Claude new capabilities.
Passed 16 of 22 test cases with the skill, and 14 of 22 without it.
3 fixed13 passed either way5 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.
I am writing an OpenAPI 3.0 YAML specification for an external user management service. Show a snippet defining the /users path with a GET operation returning a 200 JSON response.
| Checked | Without skill | With skill |
|---|---|---|
| The specification uses openapi: 3.0.0 or openapi: 3.0.x at the root level. | Missed | Passed |
| The GET operation defines responses with status code 200 and content application/json. | Passed | Passed |
The instructions your model reads when the skill loads.
You now have expertise in building MCP (Model Context Protocol) servers. MCP enables Claude to interact with external services through a standardized protocol.
MCP servers expose:
# Create project
mkdir my-mcp-server && cd my-mcp-server
python3 -m venv venv && source venv/bin/activate
# Install MCP SDK
pip install mcp
#!/usr/bin/env python3
"""my_server.py - A simple MCP server"""
from mcp.server import Server
from mcp.server.stdio import stdio_server
from mcp.types import Tool, TextContent
# Create server instance
server = Server("my-server")
# Define a tool
@server.tool()
async def hello(name: str) -> str:
test cases passed, vs 14 / 22 without
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