{"paper":{"title":"From Craft to Kernel: A Governance-First Execution Architecture and Semantic ISA for Agentic Computers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Arbiter-K enforces security as a microarchitectural property in agentic AI by reifying model outputs through a Semantic ISA into taint-tracked discrete instructions.","cross_cats":["cs.AI"],"primary_cat":"cs.CR","authors_text":"Changran Xu, Fangxin Liu, Haomin Li, Jianrong Ding, Li Jiang, Lingjun Chen, Qiang Xu, Shu Chi, XiangYu Wen, Xiaoyu Xu, Yuang Zhao, Zeju Li","submitted_at":"2026-04-20T05:25:37Z","abstract_excerpt":"The transition of agentic AI from brittle prototypes to production systems is stalled by a pervasive crisis of craft. We suggest that the prevailing orchestration paradigm-delegating the system control loop to large language models and merely patching with heuristic guardrails-is the root cause of this fragility. Instead, we propose Arbiter-K, a Governance-First execution architecture that reconceptualizes the underlying model as a Probabilistic Processing Unit encapsulated by a deterministic, neuro-symbolic kernel. Arbiter-K implements a Semantic Instruction Set Architecture (ISA) to reify pr"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Arbiter-K enforces security as a microarchitectural property, achieving 76% to 95% unsafe interception for a 92.79% absolute gain over native policies.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That probabilistic outputs from the underlying model can be reliably and losslessly reified into discrete instructions via the Semantic ISA without introducing new failure modes or missing critical context.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Arbiter-K is a new execution architecture that treats LLMs as probabilistic processors inside a neuro-symbolic kernel with a semantic ISA to enable deterministic security enforcement and unsafe trajectory interdiction in agentic AI.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Arbiter-K enforces security as a microarchitectural property in agentic AI by reifying model outputs through a Semantic ISA into taint-tracked discrete instructions.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"7ab37a4bfa663441fa5b4fb086b89bc5510779b37048a03663f5bcb190020e8f"},"source":{"id":"2604.18652","kind":"arxiv","version":2},"verdict":{"id":"7beb8719-e821-445a-a06d-09935ca951ec","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T04:48:32.413764Z","strongest_claim":"Arbiter-K enforces security as a microarchitectural property, achieving 76% to 95% unsafe interception for a 92.79% absolute gain over native policies.","one_line_summary":"Arbiter-K is a new execution architecture that treats LLMs as probabilistic processors inside a neuro-symbolic kernel with a semantic ISA to enable deterministic security enforcement and unsafe trajectory interdiction in agentic AI.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That probabilistic outputs from the underlying model can be reliably and losslessly reified into discrete instructions via the Semantic ISA without introducing new failure modes or missing critical context.","pith_extraction_headline":"Arbiter-K enforces security as a microarchitectural property in agentic AI by reifying model outputs through a Semantic ISA into taint-tracked discrete instructions."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.18652/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}