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A seat in the composer tool row, left of the model select, showing the preset THIS session runs — its own recorded one, not the deployment default, because a resumed session runs what it was created with. `SessionSummary` carries `agentPreset` for that, alongside `cwd` and `origin`. The switch exists only while the conversation has not started. After the first turn the seat becomes a plain label rather than a disabled menu: a greyed control reads as "temporarily unavailable", when in fact the choice is gone for good. The seat never asks in that state, and the host refuses independently with `agent-preset-locked`, so a stale client cannot slip one past it. A rejected switch restores the previous value and surfaces the host's message rather than leaving the seat showing something the session is not running.
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.