e18aa2745c
A preset is now ONE composition per process, not one per session. The roster mounts it once under a synthetic standing scope; each agent joins by having its scope key parented to the mount's. Two mechanisms in dsh-scope carry the whole change: registration views walk the parent chain (global → preset → agent, nearest shadowing farthest — ScopedLayers.chainLayers), and scoped event dispatch admits a listener tagged with an ancestor of the carrier key, which is what lets a standing composition's plan/compaction/token listeners observe each agent composed under it while a sibling preset's stay deaf. The preset plugins already key their state by Session/Agent — they predate presets and were written for the shared world — so sharing one instance is a return to their design, not a rewrite. Preset ymls are unchanged: one mount per preset means one Entry per preset, whose entry-local realms keep two presets' services apart exactly as they kept two sessions' apart before. The standing scope hangs off the service's UNTRACED context (selfCtx): a method invoked through the traceable proxy sees this.ctx rebound to the caller and carrying its shadow, and a subtree minted from that resolves every service through the shadow's fiber instead of each entry's own inject store — preset rows then fail on the very services they declare. A standing mount survives its agents deliberately. The composition a running session joined must outlive the file changing or disappearing underneath it; reclamation happens at whole-tree teardown, and file edits reach only future generations (the authoring layer swaps the pointer, never disposes a joined generation).
core/ — product API spine
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The session log, system-prompt assembly, tool registry, agent vocabulary, and concrete loop that form the harness's default control spine. These are product packages — the stable surface plugins and consumers build against.
| Package | Role | ctx key |
|---|---|---|
scope/ |
Scoped-context registration primitive | library — no ctx key |
session/ |
Event-sourced session log and in-memory store | ctx.sessions |
system-prompt/ |
Prompt and tool-schema assembly registry | ctx.systemPrompt |
tools/ |
Scoped tool registry and execution pipeline | ctx.tools |
agent/ |
Agent interface, registry, and event vocabulary | ctx.agents |
agent-loop/ |
Default concrete agent driver | ctx.agentLoop |
scope supplies the shared scoping primitive. agent owns the public seam, while agent-loop is its default implementation; extension plugins depend on the seam so the driver remains swappable.
Runnable compositions belong to examples/agent-spine-demo; this group owns only the swappable spine pieces.