Agent = Model + Harness

Agent = Model + Harness A workflow diagram generated by Archify. 01 / Requester & harness EX / Model & policy gate 03 / Tools & environment 04 / State & evaluation (off main path) User request · goal / task · Requester & harness User request goal / task Harness · loop + context assembly · Requester & harness Harness loop + context assembly Observation · result returned to harness · Requester & harness Observation result returned to harness Model · chooses next action · Model & policy gate Model chooses next action Policy / approval gate · permissions + sign-off · Model & policy gate Policy / approval gate permissions + sign-off Tool runtime · executes approved calls · Tools & environment Tool runtime executes approved calls Environment · files, APIs, systems · Tools & environment Environment files, APIs, systems Eval trace · observability + evals · State & evaluation (off main path) Eval trace observability + evals Memory & checkpoints · state persistence · State & evaluation (off main path) Memory & checkpoints state persistence result approved save state context record events proposed action next iteration acts Legend Agent logic Policy Tool action Context / trace Cloud service External system

Privilege boundary

  • • The model proposes; the harness decides what runs
  • • No direct model access to privileged tools
  • • Memory, checkpoints and eval trace stay off the action loop