Pinterest Deploys Production-Scale MCP Ecosystem: Domain-Specific Servers, Central Registry, and Mandatory Security Review

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Pinterest engineering published their production MCP architecture: a fleet of cloud-hosted MCP servers each dedicated to a single domain (Presto, Spark, Airflow), a central MCP registry serving as source-of-truth for approved servers with both UI and API discovery, and a mandatory review gate requiring Security, Legal/Privacy, and GenAI approval before production deployment. The architecture enforces fine-grained access control per server, limits context bloat via domain isolation, and uses a unified deployment pipeline so domain experts focus on business logic. Pinterest reports saving thousands of engineering hours per month.