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Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools.
Passed 21 of 23 test cases with the skill, and 12 of 23 without it.
and 9 more in the full report
9 fixed12 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 9 test cases the skill fixed. Same model, same prompt, with and without the skill.
What MCP tool annotation flag should be provided when an update tool can be called multiple times with the exact same payload without changing the end state beyond the first invocation?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies idempotentHint set to true for repeatable operations. | Missed | Passed |
The instructions your model reads when the skill loads.
To create high-quality MCP (Model Context Protocol) servers that enable LLMs to effectively interact with external services, use this skill. An MCP server provides tools that allow LLMs to access external services and APIs.
Creating a high-quality MCP server involves four main phases:
Build for Workflows, Not Just API Endpoints:
schedule_event that both checks availability and creates event)Optimize for Limited Context:
Design Actionable Error Messages:
Fetch the latest MCP protocol documentation:
Use WebFetch to load: https://modelcontextprotocol.io/llms-full.txt
For Python implementations:
https://raw.githubusercontent.com/modelcontextprotocol/python-sdk/main/README.mdFor Node/TypeScript implementations:
https://raw.githubusercontent.com/modelcontextprotocol/typescript-sdk/main/README.mdtest cases passed, vs 12 / 23 without
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