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Multi-tenant context propagation: the isolation bug you’ll still ship after Postgres RLS
Engineering • Sep 21, 2026

Multi-tenant context propagation: the isolation bug you’ll still ship after Postgres RLS

Postgres RLS can stop whole classes of cross-tenant SQL mistakes, but most real multi-tenant leaks now happen outside the request thread: pools, jobs, async boundaries and shared caches. This is a practical blueprint for propagating tenant context safely, with concrete failure modes and tests.

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MCP 2026-07-28 spec update: stateless cores, cacheable tool listings, and MRTR without security pain
Engineering • Sep 4, 2026

MCP 2026-07-28 spec update: stateless cores, cacheable tool listings, and MRTR without security pain

The MCP 2026-07-28 spec turns MCP into a first-class stateless HTTP workload and formalises caching and multi-round trips. That’s a performance win, but it also changes how you should route, authorise, and review MCP traffic in enterprise deployments.

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