MCP at the Edge: What Changes When MCP Runs Securely in Every POP
Blog post from Fastly
Fastly has released an example project for running Model Context Protocol (MCP) servers as stateless WebAssembly applications on its global Compute edge network, aiming to reduce the repeated long-distance latency that can slow AI agents making many tool calls. The approach relies on the MCP specification’s stateless design, in which identity, capabilities, and necessary state travel with individual requests rather than being stored in sessions tied to a single server or region. It supports multi-step and long-running work through encrypted continuation tokens and task handles, allowing requests to resume or be polled without persistent connections. Frequently requested tool, prompt, and resource catalogs can be edge-cached, while personalized responses are excluded from caching. The prototype also applies security controls at the edge, including fail-closed authentication, JWT verification, scope-based authorization, request-size limits, SSRF protections, and error redaction, while using Fastly platform features such as rapid startup, WebAssembly isolation, DDoS mitigation, and request collapsing.
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