feat(tui): interactive Plugins Hub overlay for enable/disable

The TUI had no way to toggle plugins — `/plugins` only printed a static
list, and the classic `hermes plugins` picker is curses-based and can't
run inside the Ink UI. Users had to drop to a separate shell and run
`hermes plugins enable/disable`.

Add a PluginsHub overlay modeled on the existing SkillsHub:

- New gateway RPC `plugins.manage` (list + toggle) backed by the same
  disk-discovery + dashboard_set_agent_plugin_enabled primitives the CLI
  and dashboard already use, so all three surfaces agree on state. The
  toggle path also wires the plugin's toolset into platform_toolsets.
- `/plugins` with no arg opens the hub; any subcommand still falls
  through to the text slash worker for CLI parity.
- pluginsHub overlay state threaded through overlayStore / interfaces /
  useInputHandlers (Esc closes) / appOverlays (renders the FloatBox);
  preserved across turn teardown like other user-toggled overlays.
- Hub UI: arrow/number select, Enter/Space toggles live, Tab switches
  user-only vs all (bundled) scope, shows ✓/✗/○ activation glyphs.

plugins.manage added to _LONG_HANDLERS (disk + config I/O).

tui_gateway/server.py

@@ -175,6 +175,7 @@ _LONG_HANDLERS = frozenset(
     {
         "browser.manage",
         "cli.exec",
+        "plugins.manage",
         "session.branch",
         "session.compress",
         "session.resume",
@@ -9242,7 +9243,83 @@ def _(rid, params: dict) -> dict:
         return _err(rid, 5025, str(e))
 
 
-# ── Methods: shell ───────────────────────────────────────────────────
+@method("plugins.manage")
+def _(rid, params: dict) -> dict:
+    """List installed plugins with activation state, or toggle one on/off.
+
+    Backs the TUI Plugins Hub. Uses the same disk-discovery + enable/disable
+    primitives as ``hermes plugins`` / the dashboard, so the three surfaces
+    agree on what's installed and what's enabled.
+
+    Actions:
+      - ``list``   → {"plugins": [{name, version, description, source,
+                       status}], "user_count": N, "bundled_count": M}
+      - ``toggle`` → flip ``name`` based on ``enable`` (bool). Returns the
+                       refreshed row plus {"ok", "unchanged"}.
+    """
+    action = params.get("action", "list")
+    try:
+        from hermes_cli.plugins_cmd import (
+            _discover_all_plugins,
+            _get_disabled_set,
+            _get_enabled_set,
+            _plugin_status,
+        )
+
+        def _rows():
+            enabled = _get_enabled_set()
+            disabled = _get_disabled_set()
+            out = []
+            for name, version, desc, source, _dir, key in sorted(
+                _discover_all_plugins()
+            ):
+                out.append(
+                    {
+                        "name": name,
+                        "version": str(version or ""),
+                        "description": desc or "",
+                        "source": source,
+                        "status": _plugin_status(name, enabled, disabled, key=key),
+                    }
+                )
+            return out
+
+        if action == "list":
+            rows = _rows()
+            user_count = sum(1 for r in rows if r["source"] != "bundled")
+            return _ok(
+                rid,
+                {
+                    "plugins": rows,
+                    "user_count": user_count,
+                    "bundled_count": len(rows) - user_count,
+                },
+            )
+
+        if action == "toggle":
+            from hermes_cli.plugins_cmd import dashboard_set_agent_plugin_enabled
+
+            name = (params.get("name") or "").strip()
+            if not name:
+                return _err(rid, 4019, "plugins.toggle requires a 'name'")
+            enable = bool(params.get("enable"))
+            result = dashboard_set_agent_plugin_enabled(name, enabled=enable)
+            if not result.get("ok"):
+                return _err(rid, 5026, result.get("error") or "toggle failed")
+            row = next((r for r in _rows() if r["name"] == name), None)
+            return _ok(
+                rid,
+                {
+                    "ok": True,
+                    "unchanged": bool(result.get("unchanged")),
+                    "name": name,
+                    "plugin": row,
+                },
+            )
+
+        return _err(rid, 4017, f"unknown plugins action: {action}")
+    except Exception as e:
+        return _err(rid, 5026, str(e))
 
 
 @method("shell.exec")

ui-tui/src/app/interfaces.ts

@@ -93,6 +93,7 @@ export interface OverlayState {
   confirm: ConfirmReq | null
   modelPicker: boolean
   pager: null | PagerState
+  pluginsHub: boolean
   secret: null | SecretReq
   sessions: boolean
   skillsHub: boolean

ui-tui/src/app/overlayStore.ts

@@ -10,6 +10,7 @@ const buildOverlayState = (): OverlayState => ({
   confirm: null,
   modelPicker: false,
   pager: null,
+  pluginsHub: false,
   secret: null,
   sessions: false,
   skillsHub: false,
@@ -20,8 +21,10 @@ export const $overlayState = atom<OverlayState>(buildOverlayState())
 
 export const $isBlocked = computed(
   $overlayState,
-  ({ agents, approval, clarify, confirm, modelPicker, pager, secret, sessions, skillsHub, sudo }) =>
+  ({ agents, approval, clarify, confirm, modelPicker, pager, pluginsHub, secret, sessions, skillsHub, sudo }) =>
-    Boolean(agents || approval || clarify || confirm || modelPicker || pager || secret || sessions || skillsHub || sudo)
+    Boolean(
+      agents || approval || clarify || confirm || modelPicker || pager || pluginsHub || secret || sessions || skillsHub || sudo
+    )
 )
 
 export const getOverlayState = () => $overlayState.get()
@@ -46,6 +49,7 @@ export const resetFlowOverlays = () =>
     agents: $overlayState.get().agents,
     agentsInitialHistoryIndex: $overlayState.get().agentsInitialHistoryIndex,
     modelPicker: $overlayState.get().modelPicker,
+    pluginsHub: $overlayState.get().pluginsHub,
     sessions: $overlayState.get().sessions,
     skillsHub: $overlayState.get().skillsHub
   })

ui-tui/src/app/slash/commands/ops.ts

@@ -652,6 +652,34 @@ export const opsCommands: SlashCommand[] = [
     }
   },
 
+  {
+    help: 'view & toggle plugins (no arg opens the hub; enable/disable <name> for direct toggle)',
+    name: 'plugins',
+    run: (arg, ctx, cmd) => {
+      // No argument → open the interactive Plugins Hub overlay. Any
+      // subcommand (enable/disable/list/install/…) falls through to the
+      // text slash worker so it stays at parity with `hermes plugins`.
+      if (!arg.trim()) {
+        return patchOverlayState({ pluginsHub: true })
+      }
+
+      ctx.gateway.gw
+        .request<SlashExecResponse>('slash.exec', { command: cmd.slice(1), session_id: ctx.sid })
+        .then(r => {
+          if (ctx.stale()) {
+            return
+          }
+
+          const body = r?.output || '/plugins: no output'
+          const text = r?.warning ? `warning: ${r.warning}\n${body}` : body
+          const long = text.length > 180 || text.split('\n').filter(Boolean).length > 2
+
+          long ? ctx.transcript.page(text, 'Plugins') : ctx.transcript.sys(text)
+        })
+        .catch(ctx.guardedErr)
+    }
+  },
+
   {
     help: 'enable or disable tools (client-side history reset on change)',
     name: 'tools',

ui-tui/src/app/useInputHandlers.ts

@@ -151,6 +151,10 @@ export function useInputHandlers(ctx: InputHandlerContext): InputHandlerResult {
       return patchOverlayState({ skillsHub: false })
     }
 
+    if (overlay.pluginsHub) {
+      return patchOverlayState({ pluginsHub: false })
+    }
+
     if (overlay.sessions) {
       return patchOverlayState({ sessions: false })
     }

ui-tui/src/components/appOverlays.tsx

@@ -11,6 +11,7 @@ import { FloatBox } from './appChrome.js'
 import { MaskedPrompt } from './maskedPrompt.js'
 import { ModelPicker } from './modelPicker.js'
 import { OverlayHint } from './overlayControls.js'
+import { PluginsHub } from './pluginsHub.js'
 import { ApprovalPrompt, ClarifyPrompt, ConfirmPrompt } from './prompts.js'
 import { SkillsHub } from './skillsHub.js'
 
@@ -125,6 +126,7 @@ export function FloatingOverlays({
     overlay.pager ||
     overlay.sessions ||
     overlay.skillsHub ||
+    overlay.pluginsHub ||
     completions.length
 
   if (!hasAny) {
@@ -174,6 +176,12 @@ export function FloatingOverlays({
         </FloatBox>
       )}
 
+      {overlay.pluginsHub && (
+        <FloatBox color={theme.color.border}>
+          <PluginsHub gw={gw} onClose={() => patchOverlayState({ pluginsHub: false })} t={theme} />
+        </FloatBox>
+      )}
+
       {overlay.pager && (
         <FloatBox color={theme.color.border}>
           <Box flexDirection="column" paddingX={1} paddingY={1}>

ui-tui/src/components/pluginsHub.tsx

@@ -0,0 +1,238 @@
+import { Box, Text, useInput, useStdout } from '@hermes/ink'
+import { useEffect, useState } from 'react'
+
+import type { GatewayClient } from '../gatewayClient.js'
+import { rpcErrorMessage } from '../lib/rpc.js'
+import type { Theme } from '../theme.js'
+
+import { OverlayHint, useOverlayKeys, windowItems, windowOffset } from './overlayControls.js'
+
+const VISIBLE = 12
+const MIN_WIDTH = 44
+const MAX_WIDTH = 96
+
+interface PluginRow {
+  description?: string
+  name: string
+  source?: string
+  status?: string
+  version?: string
+}
+
+interface PluginsListResponse {
+  bundled_count?: number
+  plugins?: PluginRow[]
+  user_count?: number
+}
+
+interface PluginsToggleResponse {
+  name?: string
+  ok?: boolean
+  plugin?: PluginRow
+  unchanged?: boolean
+}
+
+type Scope = 'all' | 'user'
+
+const GLYPH: Record<string, string> = {
+  disabled: '✗',
+  enabled: '✓'
+}
+
+export function PluginsHub({ gw, onClose, t }: PluginsHubProps) {
+  const [rows, setRows] = useState<PluginRow[]>([])
+  const [bundledCount, setBundledCount] = useState(0)
+  const [userCount, setUserCount] = useState(0)
+  const [idx, setIdx] = useState(0)
+  const [scope, setScope] = useState<Scope>('user')
+  const [busy, setBusy] = useState(false)
+  const [err, setErr] = useState('')
+  const [loading, setLoading] = useState(true)
+
+  const { stdout } = useStdout()
+  const width = Math.max(MIN_WIDTH, Math.min(MAX_WIDTH, (stdout?.columns ?? 80) - 6))
+
+  const load = () => {
+    gw.request<PluginsListResponse>('plugins.manage', { action: 'list' })
+      .then(r => {
+        setRows(r?.plugins ?? [])
+        setUserCount(Number(r?.user_count ?? 0))
+        setBundledCount(Number(r?.bundled_count ?? 0))
+        setErr('')
+        setLoading(false)
+      })
+      .catch((e: unknown) => {
+        setErr(rpcErrorMessage(e))
+        setLoading(false)
+      })
+  }
+
+  useEffect(load, [gw])
+
+  // Default to user plugins; fall back to all when there are none so the
+  // overlay is never empty when bundled plugins exist.
+  const visibleRows = scope === 'user' ? rows.filter(r => r.source !== 'bundled') : rows
+  const effectiveRows = scope === 'user' && !visibleRows.length && rows.length ? rows : visibleRows
+  const effectiveScope: Scope = effectiveRows === visibleRows ? scope : 'all'
+  const clampedIdx = Math.min(idx, Math.max(0, effectiveRows.length - 1))
+
+  useOverlayKeys({ disabled: busy, onClose })
+
+  const toggle = (row: PluginRow) => {
+    if (busy || !row) {
+      return
+    }
+
+    const enable = row.status !== 'enabled'
+    setBusy(true)
+    setErr('')
+
+    gw.request<PluginsToggleResponse>('plugins.manage', { action: 'toggle', enable, name: row.name })
+      .then(r => {
+        if (r?.plugin) {
+          setRows(prev => prev.map(p => (p.name === r.plugin!.name ? r.plugin! : p)))
+        } else {
+          load()
+        }
+      })
+      .catch((e: unknown) => setErr(rpcErrorMessage(e)))
+      .finally(() => setBusy(false))
+  }
+
+  useInput((ch, key) => {
+    if (busy) {
+      return
+    }
+
+    const count = effectiveRows.length
+
+    if (key.upArrow && clampedIdx > 0) {
+      setIdx(clampedIdx - 1)
+
+      return
+    }
+
+    if (key.downArrow && clampedIdx < count - 1) {
+      setIdx(clampedIdx + 1)
+
+      return
+    }
+
+    // Tab toggles user-only vs all (bundled) scope.
+    if (key.tab) {
+      setScope(s => (s === 'user' ? 'all' : 'user'))
+      setIdx(0)
+
+      return
+    }
+
+    if (key.return || ch === ' ') {
+      const row = effectiveRows[clampedIdx]
+
+      if (row) {
+        toggle(row)
+      }
+
+      return
+    }
+
+    const n = ch === '0' ? 10 : parseInt(ch, 10)
+
+    if (!Number.isNaN(n) && n >= 1 && n <= Math.min(10, count)) {
+      const next = windowOffset(count, clampedIdx, VISIBLE) + n - 1
+      const row = effectiveRows[next]
+
+      if (row) {
+        setIdx(next)
+        toggle(row)
+      }
+    }
+  })
+
+  if (loading) {
+    return <Text color={t.color.muted}>loading plugins…</Text>
+  }
+
+  if (err && !rows.length) {
+    return (
+      <Box flexDirection="column" width={width}>
+        <Text color={t.color.label}>error: {err}</Text>
+        <OverlayHint t={t}>Esc/q close</OverlayHint>
+      </Box>
+    )
+  }
+
+  if (!rows.length) {
+    return (
+      <Box flexDirection="column" width={width}>
+        <Text bold color={t.color.accent}>
+          Plugins Hub
+        </Text>
+        <Text color={t.color.muted}>no plugins installed</Text>
+        <Text color={t.color.muted}>install: hermes plugins install owner/repo</Text>
+        <OverlayHint t={t}>Esc/q close</OverlayHint>
+      </Box>
+    )
+  }
+
+  const labels = effectiveRows.map(r => {
+    const status = r.status ?? 'not enabled'
+    const glyph = GLYPH[status] ?? '○'
+    const ver = r.version ? ` v${r.version}` : ''
+    const src = effectiveScope === 'all' && r.source === 'bundled' ? ' [bundled]' : ''
+    const state = status === 'enabled' ? '' : ` (${status})`
+
+    return `${glyph} ${r.name}${ver}${src}${state}`
+  })
+
+  const { items, offset } = windowItems(labels, clampedIdx, VISIBLE)
+
+  const scopeLabel =
+    effectiveScope === 'user'
+      ? `${userCount} user plugin(s)${bundledCount ? ` · +${bundledCount} bundled (Tab)` : ''}`
+      : `all ${rows.length} plugins`
+
+  return (
+    <Box flexDirection="column" width={width}>
+      <Text bold color={t.color.accent}>
+        Plugins Hub
+      </Text>
+
+      <Text color={t.color.muted}>{scopeLabel}</Text>
+      {offset > 0 && <Text color={t.color.muted}> ↑ {offset} more</Text>}
+
+      {items.map((row, i) => {
+        const lineIdx = offset + i
+        const active = clampedIdx === lineIdx
+
+        return (
+          <Text
+            bold={active}
+            color={active ? t.color.accent : t.color.muted}
+            inverse={active}
+            key={effectiveRows[lineIdx]?.name ?? row}
+            wrap="truncate-end"
+          >
+            {active ? '▸ ' : '  '}
+            {i + 1}. {row}
+          </Text>
+        )
+      })}
+
+      {offset + VISIBLE < labels.length && (
+        <Text color={t.color.muted}> ↓ {labels.length - offset - VISIBLE} more</Text>
+      )}
+
+      {err ? <Text color={t.color.label}>error: {err}</Text> : null}
+      {busy ? <Text color={t.color.accent}>updating…</Text> : null}
+
+      <OverlayHint t={t}>↑/↓ select · Enter/Space toggle · Tab user/all · 1-9,0 quick · Esc/q close</OverlayHint>
+    </Box>
+  )
+}
+
+interface PluginsHubProps {
+  gw: GatewayClient
+  onClose: () => void
+  t: Theme
+}