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A preset is a directory holding one `agent.cordis.yml`. Mounting it under an agent's scope context during `setup(agentCtx)` gives that one session its own tools and prompt sections while every other live session keeps its own. No registry gains a tier. `dsh-tools` and `dsh-system-prompt` already file registrations into the calling context's scope layer, and entry contexts chain to the context a subtree was plugged into, so a composition mounted under `agent.ctx` is that agent's alone and unwinds with it. The mount audits itself because a directly-plugged subtree is absent from `ctx.loader.entries()` and no boot audit covers it. It rejects an unscoped target, a row that never became usable, and a row that published a service into the root service realm — that last one is process-global rather than per-session, and its collision with the next session surfaces as an unhandled rejection `setup` never observes, leaving a half-composed agent that looks healthy. The package invariant re-checks that rule on every service notification, since a row publishing from a timer would escape a one-shot audit. Raises the `packages/README.md` word ceiling from 920 to 980: the group table must enumerate every group, and the new `preset/` row is necessary content. Design: .agents/notes/implemented/architecture/2026-08-03-per-session-agent-presets.md