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Public story · 2026-03-20 · source-backed
A head-to-head benchmark of OPA/Rego against AWS Cedar for MCP tool access shows Cedar wins where it matters most: mathematically verifiable policies (Cedar Analysis can formally prove correctness), zero runtime exceptions (Rego failed multiple tests), and full static analyzability. For agent contexts where a policy bug allows unintended tool execution, Cedar's constraint model is the safer choice. OPA retains edge for complex operational logic.
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Cedar's constraint model — no unbounded loops, explicit attribute types, mathematically verifiable policies — beats OPA/Rego for agent tool access control where a policy bug could allow unintended execution. Cedar Analysis can formally prove policies are correct before deploym...
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