Attested Tool-Server Admission: A Security Extension to the Model Context Protocol
The Model Context Protocol (MCP) standardizes how a large-language-model (LLM) agent and an external tool server exchange messages, but not trust: a host reads a server's self-declared tool list and dispatches calls, with no notion of which servers it may use, at what sensitivity, or which of a server's tools are in bounds. This work grew out of a concrete need -- letting the Enclawed agent use Google's externally-operated MCP servers (Gmail, Calendar, Drive) safely, admitting the server and bounding the tools it may drive, without changing MCP or Enclawed's own tool application-programming interface (API). The mechanism we built, mcp-attested (shipped in both the open enclawed-oss distri...
| Authors | Alfredo Metere |
|---|---|
| Primary category | cs.CR |
| Published | 22 May 2026 |
| Last updated at source | 1 June 2026 |
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