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feat(agent-presets): compose each session's agent from a preset cordis.yml

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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
This commit is contained in:
Yichen Jiang
2026-08-03 20:30:33 +08:00
parent 6a32047e77
commit 18fe174897
47 changed files with 1416 additions and 3 deletions
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packages/README.md
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@@ -31,6 +31,7 @@ Packages live at `packages/<group>/<pkg>/`; groups are containers, while names r
| [`spill/`](spill/README.md) | Spill capability family: storage seam, local impl, tool-result spill policy | Product — stable surface |
| [`todo/`](todo/README.md) | The model-facing `todo_write` tool | Product — stable surface |
| [`plan/`](plan/README.md) | Plan collaboration state with a direct entry command and reviewed exit | Product — stable surface |
| [`preset/`](preset/README.md) | Per-session agent composition from preset `cordis.yml` files | Product — stable surface |
| [`timeout/`](timeout/README.md) | Tool-call `tools/execute` deadline enforcement | Product — stable surface |
| [`guard/`](guard/README.md) | Loop-hygiene advisory repeat-call reminders | Product — stable surface |
| [`bundle/`](bundle/README.md) | Installable `dsh --profile` patch layers | Product — stable surface |