The plugins tab could already update one plugin or one marketplace at a time. It gains an install-wide batch and, separately, the reload step that actually makes an update take effect.
Update all runs in a DETACHED worker rather than the request handler, for a structural reason: the batch ends with the plugin the dashboard ITSELF runs from, and that step's plugin-bootstrap.js --force SIGTERMs this very server. An in-process loop would die partway through with the remaining plugins unrun and nothing left to report. Order is marketplaces (one call, no name = all) -> every other installed plugin -> AgentHub last -> one reload. Each transition is journalled to cc-update-all.json in the runtime dir, outside the plugin cache the update replaces, so whichever server is alive serves progress from it; the POST's response is only an acknowledgement.
readUpdateAll DERIVES an abandoned status for a running journal older than an hour, because a detached worker killed by a reboot leaves nobody to write the terminal entry and the button would stay wedged forever. isRunning gates a concurrent batch: two claude plugin update chains over one config dir race.
Reload is its own capability (server/lib/cc-reload.js, POST /api/cc-config/reload). /reload-plugins and /reload-skills are scoped BY CLAUDE CODE to the session that runs them, so nothing can reload a session from outside - typing into a session already running is the only real mechanism, and that is what this does, over tmux send-keys into the dashboard's live lane panes. It spawns NO claude process on purpose: a one-shot claude -p "/reload-plugins" would reload only its own short-lived session, exit, and leave a junk session in the dashboard's history - a headless run gets a full sessions row and there is no filter anywhere to suppress it. Reusing live panes means no session is created at all. Panes at a shell prompt are skipped (the text would run as a shell command) and only claude lanes are addressed, since Codex has no such command.
Update-all reloads once at the end; updating a single plugin passes reload:true and reloads immediately, and never after a failed action.
Fixes a real pre-existing bug on the way: pluginUpdate omitted -y while runClaude closes stdin, and the CLI requires it whenever stdin is not a TTY - so the per-plugin Update button failed for any plugin whose marketplace declares an install command. Also completes CcConfigChangedPayload's action union, which claimed write|delete while nine other values were already being emitted.
Verified: server 1683/1683, client 486/486 (27 new tests), build, prettier, file-header audit, openapi.yaml regenerated (117 paths). Update all was NOT executed against this machine - it would update 7 real plugins and restart the running dashboard.
