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The first AgentScope::PerSubject system agent, and the reason that scope exists. Once a night, for each person with a supervision edge, it reads every message that person and the assistant exchanged since the previous review — across all their conversations — and writes one report for the people who supervise them. Schema (all registry except reports): - supervision(subject_user_id, supervisor_user_id): the generic §0.1 edge, answering both 'whom does a background agent look at' and 'who may read what it produced', with real FKs so deleting a user cascades both ways - system_agent_coverage(agent_id, subject_user_id, covered_through): the per-subject watermark that makes 'everything since last time' a window — neither system_agent_runs (history for humans) nor system_agent_state (advances before the work), and advanced only on a completed pass so a crash re-covers instead of skipping - reports (owner schema, the second two-homes table after memory_docs): instance rows land in system.db, deliberately cleartext to the box owner, who is the intended reader (§2); the subject cannot see them structurally The pass reads the subject's database inside a supervisor's runtime, so the ephemeral session and run row land in the watcher's file; iteration is over subjects, so two parents watching one child get one review; and the subject need not be logged in when their space is unencrypted — via the new UserManager::open_unencrypted, which refuses an encrypted user outright (no key to be had) and never registers the pool as unlocked. The agent declares the new AgentMeta flag allow_tools: false, so its turn gets an empty tool registry — nothing for a prompt injection in the transcript to call — and produces its report as its final assistant message, read back from chat_history and parsed (NOTHING_TO_REPORT sentinel, no row on quiet days). chat_history::conversation_window is the transcript query; its four filters (non-ephemeral, depth 0, non-synthetic, non-empty) each guard a specific way the review would otherwise be wrong, and tool calls are absent by construction. Cadence is Run at (hour) rather than Interval — 4am local by default — with due-ness answered inside has_work against the coverage watermark, so a machine off for three days covers the whole stretch in one pass. Reports announce ReportCreated on the system bus (no subscriber yet). run_ephemeral_turn gains a per-pass system_substitutions map, which the review uses to hand the model the subject's profile under __SUBJECT_PROFILE__ — the system-context substitutions describe the session owner, the wrong person here. docs/system-agents.md gains the conversation review section; CLAUDE.md documents the scope, the tables and the tool-less design.