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The creation header names the preset a session STARTED with and is frozen, which is correct — it is a creation fact. Switching is legal only while a session is blank, and that looked like enough: no history exists yet. It is not, because the switch's effect outlives the blank window. The user switches, then sends the first message; every turn from there runs under the new composition while the header still names the old one. The session is then locked around a misrecorded preset, and resume reads the header to rebuild it — composing one preset's tools over a history another produced, which is exactly the replay the blank-only lock exists to prevent, reached by another route. A picker showed `standard` for a session running `core-web`. A switch is now an `agent-preset/selected` event appended after the swap commits, and `resolveSessionPreset()` (last selection, else the header) is what every reconstruction reads: the summary, resume, the conflict guard, and the fork introduced one layer down.
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 |
persona/ |
The agent persona as a composable row, so a preset can change identity and not only tools | — |
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.