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Public story · 2026-02-21 · source-backed
A new arXiv paper introduces PCAS (Policy Compiler for Secure Agentic Systems) — deterministic policy enforcement for LLM agents that models system state as a dependency graph and enforces policies via a reference monitor. On customer service tasks, PCAS improved policy compliance from 48% to 93% across frontier models with zero violations in instrumented runs. This fills a critical gap: prior work focused on threat modeling, while PCAS provides actual enforcement with measured results.
Each link below shares sources, entities, or timing with this story.
Shared entities / Same source / Shared topic / What happened next
Both cover PCAS, Policy Compiler, Secure Agentic Systems; cite the same source (PCAS); overlapping topics (agent, agentic, compiler, compliance, deterministic).
Simon Willison released LLM / Shared entity: LLM / Shared topic / What happened next
Linked by a graph relationship (Simon Willison released LLM); both cover LLM; overlapping topics (model, policy).
Linked by a graph relationship (Simon Willison released LLM); both cover LLM; overlapping topics (agent, model).
Linked by a graph relationship (Simon Willison released LLM); both cover LLM; overlapping topics (agent, model).
Linked by a graph relationship (Simon Willison released LLM); both cover LLM; overlapping topics (agent, agentic).
Linked by a graph relationship (Simon Willison released LLM); both cover LLM; overlapping topics (agent, agentic).
Shared entities / Same source / Shared topic
Both cover PCAS, Policy Compiler, Secure Agentic Systems; cite the same source (PCAS); overlapping topics (agent, agentic, compliance, model, policy).
Simon Willison released LLM / Shared entity: LLM / What happened next / Tension
Linked by a graph relationship (Simon Willison released LLM); both cover LLM; picks up the LLM thread on 2026-08-16.