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mcp-builder

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).

@anthropics skills/mcp-builder/SKILL.md GitHub Stars 86,759

Security score

This tab presents tested categories, issue summaries, and source snippets in an audit-style report.

Security score 97/100
Audited on Mar 28, 2026
Audit summary 0 / 0 / 3

High / Medium / Low

Categories 4
Findings 3
Platforms 1
Sources 1

Categories Tested

Instruction boundariesFilesystem writesNetwork referencesPlatform-specific install flow

Security Issues

Low External Calls
Line 41

External URL reference

Severity: Low · Category: External Calls · Line 41
Start with the sitemap to find relevant pages: `https://modelcontextprotocol.io/sitemap.xml`
Low External Calls
Line 43

External URL reference

Severity: Low · Category: External Calls · Line 43
Then fetch specific pages with `.md` suffix for markdown format (e.g., `https://modelcontextprotocol.io/specification/draft.md`).
Low External Calls
Line 203

External URL reference

Severity: Low · Category: External Calls · Line 203
- **MCP Protocol**: Start with sitemap at `https://modelcontextprotocol.io/sitemap.xml`, then fetch specific pages with `.md` suffix

Mitigations

Review the upstream repository before copying files into a local skills directory.

Confirm install instructions and supported runtimes against SKILL.md instead of a generic readme.