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refactor(web): publish transient model request capacity (round 1)

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Hypatia May
2026-07-28 18:35:39 +08:00
parent 3f0ba77bfa
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packages/host/apiproxy/README.md
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@@ -20,7 +20,9 @@ Workspace and Session lists are separate reconnect baselines. `workspace.create`
`host.openPath` opens a filesystem path with the operating system's default application (`open` on macOS, `Invoke-Item` on Windows, `xdg-open` on Linux). The opener is injectable for tests. The browser carrier applies the same loopback, same-origin restriction as `host.pickDirectory`.
`session.history` pages on message boundaries, and its tail page (no `beforeSeq`) carries session-level projections the page window cannot supply: the in-flight partial's chunk events; `todos`, the latest `todo/write` whole-list projection; and `metrics`, full-log usage deduplicated by `(turn, step)` plus current token-meter pressure and exact selected-route capacity when available. Older pages omit the session-level projections. Live `session/metrics` mux frames carry monotonic log/projection revisions, so clients reject stale frames and preserve the counters while prepending older pages. Cache reads and writes remain disjoint buckets; the cache-hit denominator is uncached input plus cache reads.
`session.history` pages on message boundaries, and its tail page (no `beforeSeq`) carries session-level projections the page window cannot supply: the in-flight partial's chunk events; `todos`, the latest `todo/write` whole-list projection; and `metrics`, full-log usage deduplicated by `(turn, step)` plus current token-meter pressure. Older pages omit the session-level projections. Live `session/metrics` mux frames carry monotonic log/projection revisions, so clients reject stale frames and preserve the counters while prepending older pages. Cache reads and writes remain disjoint buckets; the cache-hit denominator is uncached input plus cache reads.
Context capacity uses a distinct transient `session/model-request` mux frame emitted from the contained Agent notification after an actual request reaches dispatch. It carries turn, step, final provider/model, and optional capacity only to mux connections already open at that instant. `session.history`, mux subscription baselines, reconnects, and session restore never query or replay prior capacity; a frame without capacity explicitly clears the earlier connection-local value.
The `command.*` and `skill.*` domains expose the host command registry and skill catalog to clients. Every method addresses one session's agent by `sessionId` (a served session always has an Agent; `command.*` resumes cold sessions through the same path as `session.*`, while `skill.list` resolves the project root from the session header without touching the Agent registry). `command.execute` runs a slash-command line host-side and returns a detached result; the carrier's request signal cancels the running handler. `host/commands-changed` is the catalog invalidation frame: clients refetch `command.list` instead of diffing.