Researchers release MCPGuard to audit MCP SDKs for missing specification rules
Researchers introduced MCPGuard, an automated framework that detects gaps between the Model Context Protocol (MCP) specifications and its official SDK implementations. The tool uses two tracks: a structural one that compares JSON Schema constraints with normalized SDK models, and a behavioral one that extracts normative prose rules, slices function-level code, and audits them with large language…
Key points
- MCPGuard combines structural and behavioral analysis to audit MCP SDKs for specification gaps
- Found 13 gaps in Python 1.26.0 SDK and 19 in TypeScript 1.29.0, none detected by prior tools
- Gaps can propagate to downstream applications using MCP servers, per test results
MCPGuard was tested on the official Python 1.26.0 and TypeScript 1.29.0 SDKs, uncovering 13 and 19 conformance gaps, respectively. These gaps were not detected by existing black-box baseline tools. The researchers also found that such omissions can propagate downstream to applications using MCP servers, emphasizing the need for SDK-level testing beyond endpoint validation.
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