Salt Security MCP Hardening Blueprint: What a Fully Hardened MCP Server Looks Like — OAuth 2.1 PKCE, Signed Identities, Automated Scope Expiry

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Salt Security published a production blueprint for hardened MCP servers: OAuth 2.1 with PKCE for authentication, signed identities mapped to verified client entities, automated scope expiry, strict JSON-RPC schema validation, rate-limited discovery endpoints, stripped verbose identity banners, and continuous observability logging of capability discovery and invocation events. Covers the full lifecycle from authentication to runtime monitoring.