Records are pruned by observation rather than by a disposal hook, for the reason the module already states: three different owners can tear a subtree down, and a cleared `uid` is what they share. That leaves the pruning to whoever reads — and the only production reader is the invariant companion, whose package is a development composition a shipped host never loads. So a live host pruned nothing: every session ever composed left a record retaining its whole disposed subtree, since the fiber holds its config and that config is the key its EntryTree is stored under. Prune on the mount path too. Every session takes it, which bounds the set at one generation of dead records instead of one per session.
preset/ — per-session agent composition
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An agent preset is a directory holding one agent.cordis.yml. Mounting it under an agent's scope context gives that session its own tools and prompt sections while every other live session keeps its own, so one process can run several differently composed agents at once.
| Package | Role | ctx key |
|---|---|---|
agent-presets/ |
Preset vocabulary, filesystem discovery over trusted and user-authored roots, and the guarded per-agent mount | ctx.agentPresets |
The composition split this group assumes: registries and cross-session facilities are process singletons and stay in the host composition, while a preset carries what one agent contributes to them. A preset that names a row publishing a process-global service is rejected at mount rather than allowed to collide with the next session.
Design: the per-session agent-preset note.