Files
deepseek-harness/packages/host
Yichen Jiang d099a24cb1 fix(web): resume the preset the log records, and serialize the switch
Six review findings on the select surface, all reachable from the wire:

**Resume read the header, not the log.** The switch was recorded as
`agent-preset/selected` and every projection resolved from it, but `agentFor`
still composed from `inspected.meta.agentPreset` — the value written once at
creation. A blank session that switched and then ran turns came back after a
restart under the ORIGINAL preset, restoring that history under the tool set it
was not produced with, which is the mismatch this feature exists to prevent.
`inspected` already carries the events.

**Cold summaries dropped the preset entirely.** `summarizeCold` hand-copied
three header fields and omitted the fourth, so a restored session reported no
preset and the picker showed the deployment default. It now uses the same
projection the attached path does.

**`select` had no gate.** Two concurrent selects both passed the blank check;
the second `unmountPresetFor` then found no record, because the first had
already removed it, and both mounts installed into one agent layer. Selects on
one session now queue, and the blank check is re-read inside the queue. This is
not turn admission — a `session.prompt` racing a switch is the agent loop's to
reserve — but it closes the select-versus-select tear-down.

**A same-id restore was skipped.** The roster is a live directory, so "the same
inputs that worked a moment ago" does not hold: a changed file is exactly how a
same-id reselect fails, and skipping the restore left the agent with no
composition at all.

**`writable` was dead state**, initialized true and never set, so the row could
never disable. It now carries `settings.describe`'s bit — a browser that may
not write settings sees the current default and no control, rather than one
whose write answers `settings-not-exposed`.

**`list` was documented as id-ordered.** It is root-precedence order with each
root's own presets sorted, first root to supply an id winning.
2026-08-07 11:45:10 +08:00
..

host/ — web-GUI host half

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The host side of the dsh web GUI: the API gateway every client shape shares, and the plain HTTP server it rides on. The browser side lives in client/; the composed application is apps/cli booting the dsh-base bundle serving apps/web. All product packages.

Package Role ctx key
apiproxy/ Shared host API gateway and wire contract ctx.apiProxy
webserver/ HTTP route carrier ctx.httpServer
frontend-static/ SPA dist server on the webserver fallback seat consumes ctx.httpServer
directory-picker/ Workspace-directory picking seam ctx.directoryPicker
directory-picker-native/ Native directory-picker backend and browser interaction registers ctx.directoryPicker
directory-picker-browse/ In-app directory-browser backend and interaction registers ctx.directoryPicker
directory-picker-auto/ Host-adaptive picker composition mounts a backend

apiproxy remains transport-independent; client/connection supplies the browser/HTTP carrier. Picker implementations replace one another behind the shared seam.