d3d01cb49c
The decoration scan read a mutable lexicon() aggregation during render with no subscription, so a catalog settling or a child spawning after prewarm left drafted tokens undecorated until an unrelated re-render. The controller now publishes the aggregation as a snapshot store fed by a new optional SlashSource.subscribeLexicon hook (ui-skill notifies on settle/invalidate, ui-subagent forwards the session-list feed), the composer keyboard face exposes it as an observable, and InputBar subscribes through uSES. Sources registered after scope birth now warm and join live controllers via a service broadcast.
@deepseek-ai/dsh-client-ui-subagent
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Subagent reference source, browser half: registers the @-trigger subagent source into ctx.slash. Candidates are zero-RPC — filtered from the root ctx.sessions.list snapshot captured at registration (children of the per-call projection's session: parentId matches, running, displayTitle contains the query); picking a candidate lands the literal @label text through the slash pipeline (decision 21 plain-text reference), and the source codec projects both faces as @label — the model serialization stays the raw label until the @ consumption feature defines a model representation. The source implements no matchSpace/matchEnter hooks — subagent references never enter command adjudication and ride ordinary prompts into the default sink.
A session with no running children is simply candidate-less. This phase ships "menu + reference text" only; what consuming an @label means (steering the child, resuming a disposed one) is future business work.
The /client export surface is the plugin body (apply/inject) only; the source object is internal to the registration effect.
Model Experience
Subagent label text in the user prompt
What the model sees
A picked candidate lands the literal @label (the child session's display title) in the draft; the text reaches the model verbatim inside the ordinary user message (session.prompt), with no dedicated content block, prompt section, or host-side resolution. No consumption semantics exist yet: the model sees plain text and interprets it unaided.
Token effect
Conditional and tiny: only a pick (or hand-typing the same text) adds the label's characters to that one user message. Menu browsing adds zero model tokens (candidates never leave the browser).
KV Cache effect
Append-only: the reference is part of a new user message appended after the reusable history prefix. This package never edits earlier request tokens.
Known Limitations and Deferred Work
@consumption semantics are unbuilt — the reference is inert text; wiring it to steer/message the named child (and whether resuming a disposed child is allowed) awaits its own design decision in the ledger.- Candidates are running children only — completed or disposed subagents never appear, and the roster is the scoped session's direct children (no grandchildren, no cross-session agents).
- Labels are display titles, not stable ids — two children sharing a display title produce indistinguishable references, and a title change orphans previously inserted text. Acceptable while references are inert; a consumption feature must bind to session ids.