Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
91
71%
Does it follow best practices?
Impact
93%
2.21xAverage score across 10 eval scenarios
Low
Low-risk findings worth noting
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tessl review fix ./.agent/skills/mcp-builder/SKILL.mdThe canonical home for this skill is pleaseai/mcp-dev
Low
Low-risk findings.
1 low severity finding. Worth noting, but not necessarily harmful.
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
The workflow fetches SDK READMEs via WebFetch from GitHub and queries external URLs/APIs during MCP development research.
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