diff --git a/README.md b/README.md
index 491e97b..4bcb657 100644
--- a/README.md
+++ b/README.md
@@ -198,6 +198,8 @@ set -Ue __fish_config_op_greeting
 
 Command shadows react immediately; bindings, prompt, and abbreviations take effect in new shells. With aliases disabled, `rm` deletes permanently again instead of trashing. See `help config opinionated` for the full component list.
 
+> **Tip:** Run `config-toggle` for an interactive TUI to toggle these settings without typing variable names.
+
 ---
 
 ## Attribution
diff --git a/docs/fish-config.index b/docs/fish-config.index
index f999958..8cf6510 100644
--- a/docs/fish-config.index
+++ b/docs/fish-config.index
@@ -139,6 +139,10 @@ media=## 5.13 Media and Utilities
 dng2avif=### dng2avif
 spark=### spark
 miscfns=## 5.14 Miscellaneous
+config-help=### config-help
+config-update=### config-update
+config-toggle=### config-toggle
+toggle=### config-toggle
 bash=### bash
 cheat=### cheat
 dockup=### dockup
diff --git a/docs/fish-config.md b/docs/fish-config.md
index 74ff4b0..a24b2c4 100644
--- a/docs/fish-config.md
+++ b/docs/fish-config.md
@@ -1220,6 +1220,36 @@ Add -i (interactive confirmation) to destructive commands:
     config-update --dry-run
     config-update --force
 
+### config-toggle
+
+    Synopsis:  config-toggle [-h]
+
+    Opens an interactive full-screen TUI for toggling the six opinionated
+    component categories (C1–C6) and the master disable variable without
+    having to type or remember variable names. Two scope tabs allow
+    independent per-scope configuration:
+
+      Universal — persists across all sessions (set -U)
+      Session   — current shell only (set -g)
+
+    Changes apply immediately on each value keypress. Always available
+    regardless of the __fish_config_opinionated master state.
+
+    Navigation:
+      ↑ ↓ / k j   Move cursor
+      ← → / h l   Set value: OFF ← DEFAULT → ON (clamped)
+      Tab          Switch scope (Universal ↔ Session)
+      q / Escape   Exit
+
+    Left/Right (or vim-style h/l) move the highlighted value one step along
+    the OFF–DEFAULT–ON scale and stop at the ends. DEFAULT erases the
+    variable so the master switch / built-in default applies.
+
+    Flags:
+      --help / -h   Show usage.
+
+    config-toggle
+
 ### bash
 
     Synopsis:  bash [args...]
diff --git a/docs/plans/2026-06-11-config-toggle.md b/docs/plans/2026-06-11-config-toggle.md
new file mode 100644
index 0000000..ce417cc
--- /dev/null
+++ b/docs/plans/2026-06-11-config-toggle.md
@@ -0,0 +1,713 @@
+# config-toggle Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Build `config-toggle`, an interactive TUI that lets users cycle six opinionated-category variables and the master variable between ON / OFF / DEFAULT with immediate apply, across Universal and Session scopes.
+
+**Architecture:** Three fish functions: the main `config-toggle` entry point handles argument parsing, terminal setup/teardown, and the event loop; `__config_toggle_draw` renders the 14-line panel in-place; `__config_toggle_get_val` reads a scope-specific variable value via `set --show` parsing. Changes apply immediately on each Space keypress via `set -U`/`set -g`/erase.
+
+**Tech Stack:** Fish 4.x builtins only (`read`, `set`, `string`, `printf`, `tput`). No external dependencies.
+
+**Spec:** `docs/specs/2026-06-11-config-toggle-design.md`
+
+---
+
+## File Map
+
+| Action | Path | Purpose |
+|--------|------|---------|
+| Create | `functions/config-toggle.fish` | Entry point: arg parse, terminal setup/teardown, event loop |
+| Create | `functions/__config_toggle_draw.fish` | Renders the 14-line TUI panel |
+| Create | `functions/__config_toggle_get_val.fish` | Reads a variable's value in a specific scope |
+| Modify | `docs/fish-config.md` | Add `config-toggle` entry after `config-update` (line ~1222) |
+| Modify | `docs/fish-config.index` | Add `toggle` and `config-toggle` keywords |
+
+---
+
+## Panel Layout Reference
+
+```
+┌─ Opinionated Settings ────────────────────────────┐   ← line 1
+│ ● Universal  ○ Session             Tab to switch  │   ← line 2
+│──────────────────────────────────────────────────│   ← line 3
+│  ▶ Aliases         [ ON      ]  cmd shadows       │   ← line 4
+│    Auto-exec       [ ON      ]  startup           │   ← line 5
+│    Overrides       [ DEFAULT ]  keys/env/prompt   │   ← line 6
+│    Integrations    [ ON      ]  terminal coupling │   ← line 7
+│    Logging         [ ON      ]  scrollback        │   ← line 8
+│    Greeting        [ DEFAULT ]  fish_greeting     │   ← line 9
+│    ──────────────────────────────────────────     │   ← line 10
+│    Master          [ DEFAULT ]  disable all       │   ← line 11
+│──────────────────────────────────────────────────│   ← line 12
+│  ↑↓/jk: move  Space: cycle  Tab: scope  q: quit  │   ← line 13
+└──────────────────────────────────────────────────┘   ← line 14
+```
+
+Outer width: 52 chars. Inner content: 50 chars. Panel = **14 lines**.
+
+Content row layout (50 chars visible between `│`):
+```
+  [cursor 2]  [label padded to 12]  [  badge 7  ]   [desc padded to 17]   
+= 2 + 2 + 12 + 3 + 7 + 4 + 17 + 3 = 50 chars
+```
+
+Badge values (7 chars, right-padded): `"ON     "` / `"OFF    "` / `"DEFAULT"`
+
+---
+
+## Variable Reference
+
+| Row idx | Label | Variable |
+|---------|-------|----------|
+| 0 | Aliases | `__fish_config_op_aliases` |
+| 1 | Auto-exec | `__fish_config_op_autoexec` |
+| 2 | Overrides | `__fish_config_op_overrides` |
+| 3 | Integrations | `__fish_config_op_integrations` |
+| 4 | Logging | `__fish_config_op_logging` |
+| 5 | Greeting | `__fish_config_op_greeting` |
+| 6 | Master | `__fish_config_opinionated` |
+
+State cycle on Space: `on → off → DEFAULT → on`
+
+Apply commands:
+
+| Result state | Universal scope | Session scope |
+|---|---|---|
+| on | `set -U <var> on` | `set -g <var> on` |
+| off | `set -U <var> off` | `set -g <var> off` |
+| DEFAULT | `set -Ue <var>` | `set -eg <var>` |
+
+---
+
+## Task 1: Scope-value reader helper
+
+**Files:**
+- Create: `functions/__config_toggle_get_val.fish`
+
+- [ ] **Step 1: Create the file**
+
+```fish
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   __config_toggle_get_val <varname> <scope>
+#
+# DESCRIPTION
+#   Returns the current value of a named variable in the specified scope by
+#   parsing `set --show` output. Outputs "on", "off", or "DEFAULT" (when
+#   the variable is not set in that scope). Scope "session" maps to "global"
+#   in fish's internal terminology.
+#
+# ARGUMENTS
+#   varname  Variable name without $ prefix
+#   scope    "universal" or "session"
+#
+# RETURNS
+#   0  Always; prints "on", "off", or "DEFAULT" to stdout
+#
+# EXAMPLE
+#   set result (__config_toggle_get_val __fish_config_op_aliases universal)
+#   # result == "on" | "off" | "DEFAULT"
+function __config_toggle_get_val
+    set -l varname $argv[1]
+    set -l scope $argv[2]
+
+    # fish uses "global" in set --show output for what we call "session"
+    set -l scope_kw $scope
+    if test $scope = session
+        set scope_kw global
+    end
+
+    set -l found 0
+    for line in (set --show $varname 2>/dev/null)
+        if string match -q "*$scope_kw scope*" $line
+            set found 1
+            continue
+        end
+        if test $found -eq 1
+            set found 0
+            # Format: $varname[1]: |value|
+            set -l val (string replace -r '^\$[^\[]+\[1\]: \|(.+)\|$' '$1' $line 2>/dev/null)
+            if test -n "$val" -a "$val" != $line
+                echo $val
+                return 0
+            end
+        end
+    end
+
+    echo DEFAULT
+    return 0
+end
+```
+
+- [ ] **Step 2: Verify it reads correctly**
+
+In a fish shell, run:
+```fish
+set -U __fish_config_op_aliases on
+set result (__config_toggle_get_val __fish_config_op_aliases universal)
+echo "universal: $result"   # expected: on
+set result (__config_toggle_get_val __fish_config_op_aliases session)
+echo "session:   $result"   # expected: DEFAULT  (no global set)
+set -g __fish_config_op_aliases off
+set result (__config_toggle_get_val __fish_config_op_aliases session)
+echo "session:   $result"   # expected: off
+# cleanup
+set -Ue __fish_config_op_aliases
+set -eg __fish_config_op_aliases
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add functions/__config_toggle_get_val.fish
+git commit -m "feat(config-toggle): add scope-specific variable reader helper"
+```
+
+---
+
+## Task 2: Panel renderer
+
+**Files:**
+- Create: `functions/__config_toggle_draw.fish`
+
+- [ ] **Step 1: Create the file**
+
+```fish
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   __config_toggle_draw <cur_row> <cur_scope> <var1> ... <var7>
+#
+# DESCRIPTION
+#   Renders the 14-line config-toggle TUI panel to stdout. Intended to be
+#   called once on startup, then again after each keypress preceded by
+#   `printf '\e[14A\e[J'` (cursor-up 14 lines + clear-to-end) to redraw
+#   in place. Does not move the cursor — caller manages positioning.
+#
+# ARGUMENTS
+#   cur_row    0–6, the currently highlighted row
+#   cur_scope  "universal" or "session"
+#   var1–var7  Variable names for rows 0–6 (in order per Variable Reference)
+#
+# RETURNS
+#   0  Always
+#
+# EXAMPLE
+#   __config_toggle_draw 0 universal \
+#       __fish_config_op_aliases __fish_config_op_autoexec \
+#       __fish_config_op_overrides __fish_config_op_integrations \
+#       __fish_config_op_logging __fish_config_op_greeting \
+#       __fish_config_opinionated
+function __config_toggle_draw
+    set -l cur_row   $argv[1]
+    set -l cur_scope $argv[2]
+    set -l vars      $argv[3..]
+
+    set -l c_ok    (set_color green)
+    set -l c_err   (set_color red)
+    set -l c_dim   (set_color brblack)
+    set -l c_sel   (set_color --bold magenta)
+    set -l c_hi    (set_color --bold white)
+    set -l c_head  (set_color --bold cyan)
+    set -l c_reset (set_color normal)
+
+    set -l labels  Aliases Auto-exec Overrides Integrations Logging Greeting Master
+    set -l descs   "cmd shadows" startup "keys/env/prompt" "terminal coupling" scrollback fish_greeting "disable all"
+
+    # Panel dimensions
+    set -l IW 50   # inner width (chars between │ │)
+    set -l HBR (string repeat -n $IW '─')
+
+    # ── Scope tabs ────────────────────────────────────────
+    if test $cur_scope = universal
+        set -l u_label "$c_hi● Universal$c_reset"
+        set -l s_label "○ Session  "
+    else
+        set -l u_label "○ Universal"
+        set -l s_label "$c_hi● Session  $c_reset"
+    end
+
+    # ── Top border ────────────────────────────────────────
+    # "─ Opinionated Settings " = 23 chars; fill rest to IW-1 then ┐
+    printf '┌─%s Opinionated Settings %s┐\n' \
+        $c_head $c_reset(string repeat -n (math $IW - 24) '─')
+
+    # ── Scope tab line ────────────────────────────────────
+    # Content: " ● Universal  ○ Session             Tab to switch "  (50 vis chars)
+    printf '│ %s  %s%s│\n' \
+        $u_label $s_label \
+        (string repeat -n 12 ' ')"Tab to switch  "
+
+    # ── Top divider ───────────────────────────────────────
+    printf '│%s│\n' $HBR
+
+    # ── Category rows 0–5 ─────────────────────────────────
+    for i in (seq 0 5)
+        set -l idx    (math $i + 1)
+        set -l var    $vars[$idx]
+        set -l label  $labels[$idx]
+        set -l desc   $descs[$idx]
+
+        set -l val (__config_toggle_get_val $var $cur_scope)
+
+        # Badge: 7 visible chars, coloured
+        switch $val
+            case on
+                set -l badge "$c_ok""ON     $c_reset"
+            case off
+                set -l badge "$c_err""OFF    $c_reset"
+            case '*'
+                set -l badge "$c_dim""DEFAULT$c_reset"
+        end
+
+        # Cursor: 2 visible chars
+        if test $i -eq $cur_row
+            set -l curs "$c_sel▶$c_reset "
+        else
+            set -l curs "  "
+        end
+
+        # Label padded to 12, desc padded to 17, right margin 3
+        set -l lpad (string pad -r -w 12 -- $label)
+        set -l dpad (string pad -r -w 17 -- $desc)
+
+        printf '│  %s%s [ %s ]  %s   │\n' $curs $lpad $badge $dpad
+    end
+
+    # ── Separator before Master ───────────────────────────
+    printf '│    %s  │\n' (string repeat -n (math $IW - 6) '─')
+
+    # ── Master row (index 6) ──────────────────────────────
+    set -l val (__config_toggle_get_val $vars[7] $cur_scope)
+    switch $val
+        case on
+            set -l badge "$c_ok""ON     $c_reset"
+        case off
+            set -l badge "$c_err""OFF    $c_reset"
+        case '*'
+            set -l badge "$c_dim""DEFAULT$c_reset"
+    end
+    if test $cur_row -eq 6
+        set -l curs "$c_sel▶$c_reset "
+    else
+        set -l curs "  "
+    end
+    printf '│  %s%s [ %s ]  %s   │\n' \
+        $curs \
+        (string pad -r -w 12 -- Master) \
+        $badge \
+        (string pad -r -w 17 -- "disable all")
+
+    # ── Bottom divider ────────────────────────────────────
+    printf '│%s│\n' $HBR
+
+    # ── Keybind hint ──────────────────────────────────────
+    printf '│  %s↑↓/jk: move  Space: cycle  Tab: scope  q: quit%s  │\n' \
+        $c_dim $c_reset
+
+    # ── Bottom border ─────────────────────────────────────
+    printf '└%s┘\n' $HBR
+end
+```
+
+- [ ] **Step 2: Smoke-test the renderer**
+
+In a fish shell:
+```fish
+source functions/__config_toggle_draw.fish
+source functions/__config_toggle_get_val.fish
+__config_toggle_draw 0 universal \
+    __fish_config_op_aliases __fish_config_op_autoexec \
+    __fish_config_op_overrides __fish_config_op_integrations \
+    __fish_config_op_logging __fish_config_op_greeting \
+    __fish_config_opinionated
+```
+
+Expected: a 14-line bordered panel. Row 0 (Aliases) has `▶` in magenta. All badges show DEFAULT (dim) since no vars are set. Check that the panel is 52 chars wide.
+
+- [ ] **Step 3: Verify with a value set**
+
+```fish
+set -U __fish_config_op_aliases on
+__config_toggle_draw 0 universal \
+    __fish_config_op_aliases __fish_config_op_autoexec \
+    __fish_config_op_overrides __fish_config_op_integrations \
+    __fish_config_op_logging __fish_config_op_greeting \
+    __fish_config_opinionated
+set -Ue __fish_config_op_aliases
+```
+
+Expected: Aliases row badge shows green `ON     `. All others show `DEFAULT`.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add functions/__config_toggle_draw.fish
+git commit -m "feat(config-toggle): add panel renderer helper"
+```
+
+---
+
+## Task 3: Main function — skeleton, help flag, terminal setup
+
+**Files:**
+- Create: `functions/config-toggle.fish`
+
+- [ ] **Step 1: Create the skeleton with help flag**
+
+```fish
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   config-toggle [-h | --help]
+#
+# DESCRIPTION
+#   Opens an interactive full-screen TUI for toggling the six opinionated
+#   component categories (C1–C6) and the master disable variable without
+#   having to remember variable names. Two scope tabs allow independent
+#   per-scope configuration:
+#
+#     Universal — persists across all sessions (set -U / set -Ue)
+#     Session   — active for the current shell only (set -g / set -eg)
+#
+#   Changes apply immediately on each Space keypress — no confirm step.
+#   Always available regardless of __fish_config_opinionated state.
+#
+# ARGUMENTS
+#   -h, --help  Print usage and exit
+#
+# RETURNS
+#   0  Exited normally (q or Escape pressed)
+#   1  Unknown flag passed
+#
+# EXAMPLE
+#   config-toggle
+function config-toggle --description 'Interactive TUI for toggling opinionated component settings'
+    set -l c_head  (set_color --bold cyan)
+    set -l c_cmd   (set_color --bold white)
+    set -l c_flag  (set_color yellow)
+    set -l c_dim   (set_color brblack)
+    set -l c_err   (set_color red)
+    set -l c_reset (set_color normal)
+
+    # ── Argument parsing ──────────────────────────────────
+    for arg in $argv
+        switch $arg
+            case -h --help
+                echo "$c_head""Usage:$c_reset $c_cmd""config-toggle$c_reset $c_flag""[-h]$c_reset"
+                echo
+                echo "  Interactive TUI for toggling opinionated component categories."
+                echo "  Changes apply immediately — no confirm step required."
+                echo
+                echo "$c_head""Navigation:$c_reset"
+                echo "  $c_flag↑ ↓$c_reset or $c_flag""j k$c_reset    Move cursor up / down"
+                echo "  $c_flag""Space$c_reset         Cycle: ON → OFF → DEFAULT → ON"
+                echo "  $c_flag""Tab$c_reset           Switch scope (Universal ↔ Session)"
+                echo "  $c_flag""q$c_reset / $c_flag""Escape$c_reset    Exit"
+                echo
+                echo "$c_head""Scopes:$c_reset"
+                echo "  $c_flag""Universal$c_reset   Persistent across all sessions ($c_dim""set -U$c_reset)"
+                echo "  $c_flag""Session$c_reset     Current session only ($c_dim""set -g$c_reset)"
+                return 0
+            case '*'
+                echo "$c_err""Unknown option: $arg$c_reset" >&2
+                echo "Run $c_cmd""config-toggle --help$c_reset for usage." >&2
+                return 1
+        end
+    end
+end
+```
+
+- [ ] **Step 2: Verify help output**
+
+```fish
+config-toggle --help
+```
+
+Expected: coloured usage output, exits 0.
+
+```fish
+config-toggle --bogus
+echo $status   # expected: 1
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add functions/config-toggle.fish
+git commit -m "feat(config-toggle): add function skeleton and help flag"
+```
+
+---
+
+## Task 4: Event loop — navigation and scope switching
+
+**Files:**
+- Modify: `functions/config-toggle.fish` (add after the arg-parse block, before the final `end`)
+
+- [ ] **Step 1: Add terminal setup, initial draw, and event loop**
+
+Replace the final `end` of `config-toggle` with this block:
+
+```fish
+    # ── Variable list (matches Panel Layout Reference) ────
+    set -l vars \
+        __fish_config_op_aliases \
+        __fish_config_op_autoexec \
+        __fish_config_op_overrides \
+        __fish_config_op_integrations \
+        __fish_config_op_logging \
+        __fish_config_op_greeting \
+        __fish_config_opinionated
+
+    set -l cur_row   0           # 0–6
+    set -l cur_scope universal   # or "session"
+    set -l panel_h   14          # total panel lines
+
+    # ── Terminal setup ────────────────────────────────────
+    printf '\e[?25l'             # hide cursor
+    trap 'printf "\e[?25h"; printf "\n"' INT
+
+    # ── Initial draw ──────────────────────────────────────
+    __config_toggle_draw $cur_row $cur_scope $vars
+
+    # ── Event loop ────────────────────────────────────────
+    while true
+        read -k 1 -l key
+
+        switch $key
+            case \e
+                # Arrow key: ESC [ A/B — read 2 more chars with short timeout
+                read -k 2 -l seq -t 0.1
+                switch $seq
+                    case '[A'   # Up arrow
+                        set cur_row (math "max(0, $cur_row - 1)")
+                    case '[B'   # Down arrow
+                        set cur_row (math "min(6, $cur_row + 1)")
+                end
+                # If seq is empty (bare Escape), fall through to quit
+                if test -z "$seq"
+                    break
+                end
+
+            case k
+                set cur_row (math "max(0, $cur_row - 1)")
+            case j
+                set cur_row (math "min(6, $cur_row + 1)")
+
+            case \t   # Tab — switch scope
+                if test $cur_scope = universal
+                    set cur_scope session
+                else
+                    set cur_scope universal
+                end
+
+            case q Q
+                break
+        end
+
+        # Redraw in place
+        printf '\e[%dA\e[J' $panel_h
+        __config_toggle_draw $cur_row $cur_scope $vars
+    end
+
+    # ── Cleanup ───────────────────────────────────────────
+    printf '\e[?25h'   # restore cursor
+end
+```
+
+- [ ] **Step 2: Verify navigation**
+
+```fish
+config-toggle
+```
+
+Expected:
+- Panel appears, cursor is hidden
+- ↑/↓ and j/k move the `▶` cursor between rows
+- Tab switches the scope tab highlight between `● Universal` and `● Session`
+- `q` or Escape exits cleanly and restores the cursor
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add functions/config-toggle.fish
+git commit -m "feat(config-toggle): add event loop with navigation and scope switching"
+```
+
+---
+
+## Task 5: Cycling + immediate apply
+
+**Files:**
+- Modify: `functions/config-toggle.fish` (add Space handler inside the event loop)
+
+- [ ] **Step 1: Add the Space case to the switch block**
+
+Inside the `switch $key` block, add a `case ' '` handler. Insert it after the `case \t` block:
+
+```fish
+            case ' '
+                set -l varname $vars[(math $cur_row + 1)]
+                set -l cur_val (__config_toggle_get_val $varname $cur_scope)
+
+                # Cycle: on → off → DEFAULT → on
+                switch $cur_val
+                    case on
+                        set -l next_val off
+                    case off
+                        set -l next_val DEFAULT
+                    case '*'   # DEFAULT or any unrecognised
+                        set -l next_val on
+                end
+
+                # Apply immediately
+                switch $cur_scope
+                    case universal
+                        switch $next_val
+                            case on
+                                set -U $varname on
+                            case off
+                                set -U $varname off
+                            case DEFAULT
+                                set -Ue $varname
+                        end
+                    case session
+                        switch $next_val
+                            case on
+                                set -g $varname on
+                            case off
+                                set -g $varname off
+                            case DEFAULT
+                                set -eg $varname
+                        end
+                end
+```
+
+- [ ] **Step 2: Verify cycling and immediate apply**
+
+```fish
+config-toggle
+```
+
+Expected:
+- Navigate to **Aliases** (row 0), press Space → badge changes to green `ON     `, variable set immediately
+- Press Space again → badge changes to red `OFF    `
+- Press Space again → badge changes to dim `DEFAULT`
+- Press Space again → back to green `ON     `
+
+Verify the variable was actually set:
+```fish
+# In another terminal or after quitting:
+echo $__fish_config_op_aliases   # should reflect last state set
+```
+
+- [ ] **Step 3: Verify cross-scope independence**
+
+```fish
+config-toggle
+# Navigate to Integrations, Tab to Session, Space to ON
+# Tab back to Universal — badge should still show DEFAULT (separate scope)
+```
+
+Expected: Universal and Session values for the same row are independent.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add functions/config-toggle.fish
+git commit -m "feat(config-toggle): add Space cycling with immediate apply"
+```
+
+---
+
+## Task 6: Docs update
+
+**Files:**
+- Modify: `docs/fish-config.md`
+- Modify: `docs/fish-config.index`
+
+- [ ] **Step 1: Add entry to fish-config.md**
+
+In `docs/fish-config.md`, find the `### config-update` section (line ~1203). Insert the following block **immediately after** the `config-update` section ends (after the last example line `config-update --force`, before `### bash`):
+
+```markdown
+### config-toggle
+
+    Synopsis:  config-toggle [-h]
+
+    Opens an interactive full-screen TUI for toggling the six opinionated
+    component categories (C1–C6) and the master disable variable without
+    having to type or remember variable names. Two scope tabs allow
+    independent per-scope configuration:
+
+      Universal — persists across all sessions (set -U)
+      Session   — current shell only (set -g)
+
+    Changes apply immediately on each Space keypress. Always available
+    regardless of the __fish_config_opinionated master state.
+
+    Navigation:
+      ↑ ↓ / j k   Move cursor
+      Space        Cycle: ON → OFF → DEFAULT → ON
+      Tab          Switch scope (Universal ↔ Session)
+      q / Escape   Exit
+
+    Flags:
+      --help / -h   Show usage.
+
+    config-toggle
+
+```
+
+- [ ] **Step 2: Add entries to fish-config.index**
+
+In `docs/fish-config.index`, find the section that contains `config-help` and `config-update` keyword entries. Add after the last `config-update` line:
+
+```
+config-toggle=### config-toggle
+toggle=### config-toggle
+```
+
+- [ ] **Step 3: Verify docs are reachable**
+
+```fish
+config-help toggle
+```
+
+Expected: docs pager opens at the `config-toggle` section.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add docs/fish-config.md docs/fish-config.index
+git commit -m "docs(config-toggle): add config-toggle entry to offline docs and index"
+```
+
+---
+
+## Self-Review
+
+**Spec coverage check:**
+
+| Spec requirement | Covered by |
+|---|---|
+| Interactive TUI, colorful | Task 2 (renderer with set_color) |
+| ON / OFF / DEFAULT states | Tasks 2 + 5 (badge display + cycle logic) |
+| Universal / Session scope tabs | Tasks 3 + 4 (tab line + Tab key handler) |
+| Immediate apply on toggle | Task 5 (set -U/g/erase in Space handler) |
+| Tab key switches scope | Task 4 |
+| Always available (no guard) | Task 3 (function has no op_enabled wrapper) |
+| -h/--help per Convention §12 | Task 3 |
+| License header + docblock | Tasks 1, 2, 3 |
+| Color palette (Convention §11) | Tasks 2, 3 |
+| Docs update (Convention §10) | Task 6 |
+| docs/fish-config.index update | Task 6 |
+
+**Placeholder scan:** No TBDs, TODOs, or "handle edge cases" vagueness found. All code blocks are complete.
+
+**Type consistency:** `__config_toggle_get_val` returns "on", "off", or "DEFAULT" — the Space handler's `switch $cur_val` matches against those exact strings. The `$vars` array indices are 1-based in fish (used as `$vars[(math $cur_row + 1)]`) consistently throughout.
diff --git a/docs/specs/2026-06-11-config-toggle-design.md b/docs/specs/2026-06-11-config-toggle-design.md
new file mode 100644
index 0000000..5cbeba8
--- /dev/null
+++ b/docs/specs/2026-06-11-config-toggle-design.md
@@ -0,0 +1,128 @@
+# Design: `config-toggle`
+
+**Date:** 2026-06-11  
+**Status:** Approved
+
+---
+
+## Overview
+
+A new interactive TUI function, `config-toggle`, that lets users toggle the six opinionated-component category variables and the master variable without having to type or remember variable names. It is modelled on the Claude Code settings panel UX: tabbed scope selector, arrow-key row navigation, Space to cycle state, instant apply on each keypress.
+
+The function lives at `functions/config-toggle.fish` and follows all project conventions (license header, man-page docblock, color palette, help flag). It is **always available** regardless of the opinionated-component state — it must never be wrapped in a guard.
+
+---
+
+## Variables Under Management
+
+| Label | Variable | Category |
+|---|---|---|
+| Aliases | `__fish_config_op_aliases` | C1 |
+| Auto-exec | `__fish_config_op_autoexec` | C2 |
+| Overrides | `__fish_config_op_overrides` | C3 |
+| Integrations | `__fish_config_op_integrations` | C4 |
+| Logging | `__fish_config_op_logging` | C5 |
+| Greeting | `__fish_config_op_greeting` | C6 |
+| Master | `__fish_config_opinionated` | master |
+
+---
+
+## UI Layout
+
+A fixed-height bordered panel rendered with ANSI escape sequences (`tput` for terminal dimensions, `\e[` sequences for cursor positioning). The panel redraws in-place on every keystroke — no scrolling, no paging.
+
+```
+┌─ Opinionated Settings ───────────────────────┐
+│ ● Universal  ○ Session          Tab to switch │
+│──────────────────────────────────────────────│
+│  ▶ Aliases         [ ON      ]  cmd shadows   │
+│    Auto-exec       [ ON      ]  startup       │
+│    Overrides       [ DEFAULT ]  keys/env/prompt│
+│    Integrations    [ ON      ]  terminal coupling│
+│    Logging         [ ON      ]  scrollback    │
+│    Greeting        [ DEFAULT ]  fish_greeting │
+│    ────────────────────────────────────────── │
+│    Master          [ DEFAULT ]  disable all   │
+│──────────────────────────────────────────────│
+│  ↑↓ move  Space cycle  Tab scope  q quit      │
+└──────────────────────────────────────────────┘
+```
+
+### State badge colors
+
+| State | Display | Color |
+|---|---|---|
+| `ON` | `[ ON      ]` | green (`set_color green`) |
+| `OFF` | `[ OFF     ]` | red (`set_color red`) |
+| `DEFAULT` | `[ DEFAULT ]` | dim (`set_color brblack`) |
+
+---
+
+## Keybindings
+
+| Key | Action |
+|---|---|
+| `↑` / `k` | Move cursor up one row |
+| `↓` / `j` | Move cursor down one row |
+| `Space` | Cycle selected row: ON → OFF → DEFAULT → ON |
+| `Tab` | Switch active scope tab (Universal ↔ Session) |
+| `q` / `Escape` | Exit, leaving all values in place |
+
+---
+
+## Scope Tabs
+
+Two tabs: **Universal** and **Session**. Only one is active at a time (Tab to switch). The active tab label is highlighted.
+
+- **Universal tab** reads/writes universal variables (`set -U` / `set -Ue`)
+- **Session tab** reads/writes global variables for the current shell session (`set -g` / `set -eg`)
+
+Both scopes can be set independently. For example: `Integrations = off` universally and `Integrations = on` for the current session.
+
+---
+
+## State Management & Immediate Apply
+
+Each Space keypress on a row runs the corresponding fish command **immediately** — no confirm step, no exit required.
+
+| Resulting state | Universal scope | Session scope |
+|---|---|---|
+| `ON` | `set -U <var> on` | `set -g <var> on` |
+| `OFF` | `set -U <var> off` | `set -g <var> off` |
+| `DEFAULT` | `set -Ue <var>` (erase) | `set -eg <var>` (erase) |
+
+The TUI re-reads the live variable value before drawing each row, so external changes are reflected on next redraw.
+
+---
+
+## Function Signature
+
+```fish
+config-toggle [-h | --help]
+```
+
+No subcommands or positional arguments. `-h`/`--help` prints usage per Convention §12 and exits.
+
+---
+
+## Implementation Notes
+
+- Use `tput lines` and `tput cols` to detect terminal size; center or top-align the panel accordingly.
+- Save the cursor position on entry (`\e[s` or `tput sc`), hide the cursor (`tput civis`), and restore both on exit (including on `q`, Escape, and interrupt signals via `trap`).
+- Use `read -k 1` to capture single keystrokes without Enter. Handle escape sequences for arrow keys (`\e[A` = up, `\e[B` = down) by reading the next 2 bytes after `\e`.
+- The Master row is separated from the category rows by a divider line.
+- The panel width is fixed at 48 characters (fits an 80-column terminal comfortably).
+- Inline short descriptions (e.g. "cmd shadows", "startup", "keys/env/prompt") are shown to the right of each state badge.
+- `trap` on `SIGINT` and function exit to restore terminal state (show cursor, restore position) so an abrupt Ctrl-C doesn't leave the terminal broken.
+
+---
+
+## Conventions Checklist
+
+- [ ] License header (Convention §1)
+- [ ] Man-page docblock: SYNOPSIS, DESCRIPTION, ARGUMENTS, RETURNS, EXAMPLE (Convention §4)
+- [ ] Color palette variables at top of output block (Convention §11)
+- [ ] `-h`/`--help` flag (Convention §12)
+- [ ] No guard wrapper (function must be always available)
+- [ ] Update `docs/fish-config.md` with new function entry (Convention §10)
+- [ ] Update `docs/fish-config.index` to include `config-toggle`
diff --git a/functions/__config_toggle_apply.fish b/functions/__config_toggle_apply.fish
new file mode 100644
index 0000000..7ce27d0
--- /dev/null
+++ b/functions/__config_toggle_apply.fish
@@ -0,0 +1,53 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   __config_toggle_apply <varname> <scope> <value>
+#
+# DESCRIPTION
+#   Applies a state value to an opinionated-component variable in the given
+#   scope, immediately and persistently. Used by config-toggle's Left/Right
+#   (and vim h/l) directional handlers so the set/erase logic lives in one
+#   place. A value of "DEFAULT" erases the variable in that scope so the
+#   master switch / built-in default takes over again.
+#
+#     universal → set -U  (on/off)  /  set -Ue  (DEFAULT)
+#     session   → set -g  (on/off)  /  set -eg  (DEFAULT)
+#
+# ARGUMENTS
+#   varname  Variable name without the $ prefix
+#   scope    "universal" or "session"
+#   value    "on", "off", or "DEFAULT"
+#
+# RETURNS
+#   0  Always
+#
+# EXAMPLE
+#   __config_toggle_apply __fish_config_op_aliases universal off
+#   __config_toggle_apply __fish_config_op_greeting session DEFAULT
+function __config_toggle_apply
+    set -l varname $argv[1]
+    set -l scope   $argv[2]
+    set -l value   $argv[3]
+
+    switch $scope
+        case universal
+            switch $value
+                case on
+                    set -U $varname on
+                case off
+                    set -U $varname off
+                case DEFAULT
+                    set -Ue $varname
+            end
+        case session
+            switch $value
+                case on
+                    set -g $varname on
+                case off
+                    set -g $varname off
+                case DEFAULT
+                    set -eg $varname
+            end
+    end
+end
diff --git a/functions/__config_toggle_draw.fish b/functions/__config_toggle_draw.fish
new file mode 100644
index 0000000..4dd5fbe
--- /dev/null
+++ b/functions/__config_toggle_draw.fish
@@ -0,0 +1,141 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   __config_toggle_draw <cur_row> <cur_scope> <var1> ... <var7>
+#
+# DESCRIPTION
+#   Renders the 14-line config-toggle TUI panel to stdout. Intended to be
+#   called once on startup, then again after each keypress preceded by
+#   `printf '\e[14A\e[J'` (cursor-up 14 lines + clear-to-end) to redraw
+#   in place. Does not move the cursor — caller manages positioning.
+#
+# ARGUMENTS
+#   cur_row    0–6, the currently highlighted row
+#   cur_scope  "universal" or "session"
+#   var1–var7  Variable names for rows 0–6 (in order per Variable Reference)
+#
+# RETURNS
+#   0  Always
+#
+# EXAMPLE
+#   __config_toggle_draw 0 universal \
+#       __fish_config_op_aliases __fish_config_op_autoexec \
+#       __fish_config_op_overrides __fish_config_op_integrations \
+#       __fish_config_op_logging __fish_config_op_greeting \
+#       __fish_config_opinionated
+function __config_toggle_draw
+    set -l cur_row   $argv[1]
+    set -l cur_scope $argv[2]
+    set -l vars      $argv[3..]
+
+    set -l c_ok    (set_color green)
+    set -l c_err   (set_color red)
+    set -l c_dim   (set_color brblack)
+    set -l c_sel   (set_color --bold magenta)
+    set -l c_hi    (set_color --bold white)
+    set -l c_head  (set_color --bold cyan)
+    set -l c_reset (set_color normal)
+
+    set -l labels  Aliases Auto-exec Overrides Integrations Logging Greeting Master
+    set -l descs   "cmd shadows" startup "keys/env/prompt" "terminal coupling" scrollback fish_greeting "disable all"
+
+    # Panel dimensions
+    set -l IW 50   # inner width (chars between │ │)
+    set -l HBR (string repeat -n $IW '─')
+
+    # ── Scope tabs ────────────────────────────────────────
+    set -l u_label
+    set -l s_label
+    if test $cur_scope = universal
+        set u_label "$c_hi● Universal$c_reset"
+        set s_label "○ Session  "
+    else
+        set u_label "○ Universal"
+        set s_label "$c_hi● Session  $c_reset"
+    end
+
+    # ── Top border ────────────────────────────────────────
+    # Visible: ┌(1) ─(1) space(1) "Opinionated Settings"(20) space(1) N×─ ┐(1) = 52
+    # N = 52 - 25 = 27 = IW - 23
+    printf '┌─%s Opinionated Settings %s┐\n' \
+        $c_head $c_reset(string repeat -n (math $IW - 23) '─')
+
+    # ── Scope tab line ────────────────────────────────────
+    # Visible inner (50): space(1) + u_label(11) + 2spaces + s_label(11) + 10spaces + "Tab to switch  "(15) = 50
+    printf '│ %s  %s%s│\n' \
+        $u_label $s_label \
+        (string repeat -n 10 ' ')"Tab to switch  "
+
+    # ── Top divider ───────────────────────────────────────
+    printf '│%s│\n' $HBR
+
+    # ── Category rows 0–5 ─────────────────────────────────
+    for i in (seq 0 5)
+        set -l idx    (math $i + 1)
+        set -l var    $vars[$idx]
+        set -l label  $labels[$idx]
+        set -l desc   $descs[$idx]
+
+        set -l val (__config_toggle_get_val $var $cur_scope)
+
+        # Badge: 7 visible chars, coloured
+        set -l badge
+        switch $val
+            case on
+                set badge "$c_ok""     ON$c_reset"
+            case off
+                set badge "$c_err""OFF    $c_reset"
+            case '*'
+                set badge "$c_dim""DEFAULT$c_reset"
+        end
+
+        # Cursor: 2 visible chars
+        set -l curs "  "
+        if test $i -eq $cur_row
+            set curs "$c_sel▶$c_reset "
+        end
+
+        # Label padded to 12, desc padded to 17, right margin 3
+        set -l lpad (string pad -r -w 12 -- $label)
+        set -l dpad (string pad -r -w 17 -- $desc)
+
+        printf '│  %s%s [ %s ]  %s   │\n' $curs $lpad $badge $dpad
+    end
+
+    # ── Separator before Master ───────────────────────────
+    printf '│    %s  │\n' (string repeat -n (math $IW - 6) '─')
+
+    # ── Master row (index 6) ──────────────────────────────
+    set -l val (__config_toggle_get_val $vars[7] $cur_scope)
+    set -l badge
+    switch $val
+        case on
+            set badge "$c_ok""     ON$c_reset"
+        case off
+            set badge "$c_err""OFF    $c_reset"
+        case '*'
+            set badge "$c_dim""DEFAULT$c_reset"
+    end
+    set -l curs "  "
+    if test $cur_row -eq 6
+        set curs "$c_sel▶$c_reset "
+    end
+    printf '│  %s%s [ %s ]  %s   │\n' \
+        $curs \
+        (string pad -r -w 12 -- Master) \
+        $badge \
+        (string pad -r -w 17 -- "disable all")
+
+    # ── Bottom divider ────────────────────────────────────
+    printf '│%s│\n' $HBR
+
+    # ── Keybind hint ──────────────────────────────────────
+    # Padded to the inner width so the right border stays aligned regardless
+    # of the hint text. string pad is width-aware (arrows count as 1 column).
+    set -l hint " ↑↓/kj move  ←→/hl set  Tab scope  q quit"
+    printf '│%s%s%s│\n' $c_dim (string pad -r -w $IW -- $hint) $c_reset
+
+    # ── Bottom border ─────────────────────────────────────
+    printf '└%s┘\n' $HBR
+end
diff --git a/functions/__config_toggle_get_val.fish b/functions/__config_toggle_get_val.fish
new file mode 100644
index 0000000..376551a
--- /dev/null
+++ b/functions/__config_toggle_get_val.fish
@@ -0,0 +1,50 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   __config_toggle_get_val <varname> <scope>
+#
+# DESCRIPTION
+#   Returns the current value of a named variable in the specified scope by
+#   parsing `set --show` output. Outputs "on", "off", or "DEFAULT" (when
+#   the variable is not set in that scope). Scope "session" maps to "global"
+#   in fish's internal terminology.
+#
+# ARGUMENTS
+#   varname  Variable name without $ prefix
+#   scope    "universal" or "session"
+#
+# RETURNS
+#   0  Always; prints "on", "off", or "DEFAULT" to stdout
+#
+# EXAMPLE
+#   set result (__config_toggle_get_val __fish_config_op_aliases universal)
+#   # result == "on" | "off" | "DEFAULT"
+function __config_toggle_get_val
+    set -l varname $argv[1]
+    set -l scope $argv[2]
+
+    set -l scope_kw $scope
+    if test $scope = session
+        set scope_kw global
+    end
+
+    set -l found 0
+    for line in (set --show $varname 2>/dev/null)
+        if string match -q "*$scope_kw scope*" $line
+            set found 1
+            continue
+        end
+        if test $found -eq 1
+            set found 0
+            set -l val (string replace -r '^\$[^\[]+\[1\]: \|(.+)\|$' '$1' $line 2>/dev/null)
+            if test -n "$val" -a "$val" != $line
+                echo $val
+                return 0
+            end
+        end
+    end
+
+    echo DEFAULT
+    return 0
+end
diff --git a/functions/__config_toggle_read_key.fish b/functions/__config_toggle_read_key.fish
new file mode 100644
index 0000000..1929836
--- /dev/null
+++ b/functions/__config_toggle_read_key.fish
@@ -0,0 +1,89 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   __config_toggle_read_key
+#
+# DESCRIPTION
+#   Reads a single keypress directly from the controlling terminal in raw
+#   mode and echoes a normalized token naming the key. Bypasses fish's
+#   `read` builtin, whose interactive line editor swallows Tab and arrow
+#   keys (and prints a `read> ` prompt) — none of which is usable for a TUI.
+#
+#   The terminal is put into raw, no-echo mode with a 0.1s inter-byte timer
+#   (`stty raw -echo min 1 time 1`) so a multi-byte escape sequence (e.g.
+#   an arrow key, ESC [ A) is captured in one read while a lone key returns
+#   promptly. Original terminal settings are always restored before return.
+#
+#   In raw mode Ctrl-C does not raise SIGINT; it arrives as byte 3 (ETX),
+#   which is reported as the token "quit".
+#
+# ARGUMENTS
+#   (none)
+#
+# RETURNS
+#   0  A key was read; one of these tokens is printed to stdout:
+#        up down left right   arrow keys
+#        space tab enter escape
+#        quit                 Ctrl-C (byte 3) in raw mode
+#        <char>               any other single printable character
+#        ""                   nothing decodable was read
+#   1  The terminal could not be put into raw mode (stdin is not a TTY)
+#
+# EXAMPLE
+#   set -l key (__config_toggle_read_key)
+#   or return                       # not a TTY — bail
+#   switch $key
+#       case up;    echo "moved up"
+#       case space; echo "toggled"
+#   end
+function __config_toggle_read_key
+    # Snapshot current terminal settings; failure means stdin is not a TTY.
+    set -l saved (stty -g </dev/tty 2>/dev/null)
+    or return 1
+
+    # Raw, no-echo. min 1 / time 1: block for the first byte, then wait up to
+    # 0.1s for the rest of a burst (escape sequence) before returning.
+    stty raw -echo min 1 time 1 </dev/tty 2>/dev/null
+
+    # One read() of up to 3 bytes — covers ESC [ A style sequences. od emits
+    # the bytes as space-separated decimal codes.
+    set -l codes (dd if=/dev/tty bs=3 count=1 2>/dev/null \
+        | od -An -tu1 2>/dev/null | string trim | string split -n ' ')
+
+    # Restore the terminal before doing anything else.
+    stty $saved </dev/tty 2>/dev/null
+
+    switch (string join ' ' $codes)
+        case '27 91 65'
+            echo up
+        case '27 91 66'
+            echo down
+        case '27 91 67'
+            echo right
+        case '27 91 68'
+            echo left
+        case 27
+            echo escape
+        case 9
+            echo tab
+        case 32
+            echo space
+        case 10 13
+            echo enter
+        case 3
+            echo quit
+        case ''
+            echo ''
+        case '*'
+            # Single printable byte → emit its character; ignore stray
+            # multi-byte sequences we do not recognise. The two-step octal
+            # form avoids fish mangling a one-shot '\\%03o' format string.
+            if test (count $codes) -eq 1
+                set -l oct (printf '%03o' $codes[1])
+                printf '%b\n' "\\$oct"
+            else
+                echo ''
+            end
+    end
+end
diff --git a/functions/config-toggle.fish b/functions/config-toggle.fish
new file mode 100644
index 0000000..2cac262
--- /dev/null
+++ b/functions/config-toggle.fish
@@ -0,0 +1,153 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# SYNOPSIS
+#   config-toggle [-h | --help]
+#
+# DESCRIPTION
+#   Opens an interactive full-screen TUI for toggling the six opinionated
+#   component categories (C1–C6) and the master disable variable without
+#   having to remember variable names. Two scope tabs allow independent
+#   per-scope configuration:
+#
+#     Universal — persists across all sessions (set -U / set -Ue)
+#     Session   — active for the current shell only (set -g / set -eg)
+#
+#   Values are changed directionally with the arrow keys (or vim-style h/l)
+#   along an OFF ← DEFAULT → ON scale, and apply immediately — no confirm
+#   step. Always available regardless of __fish_config_opinionated state.
+#
+# ARGUMENTS
+#   -h, --help  Print usage and exit
+#
+# RETURNS
+#   0  Exited normally (q or Escape pressed)
+#   1  Unknown flag passed
+#
+# EXAMPLE
+#   config-toggle
+function config-toggle --description 'Interactive TUI for toggling opinionated component settings'
+    set -l c_head  (set_color --bold cyan)
+    set -l c_cmd   (set_color --bold white)
+    set -l c_flag  (set_color yellow)
+    set -l c_dim   (set_color brblack)
+    set -l c_err   (set_color red)
+    set -l c_reset (set_color normal)
+
+    # ── Argument parsing ──────────────────────────────────
+    for arg in $argv
+        switch $arg
+            case -h --help
+                echo "$c_head""Usage:$c_reset $c_cmd""config-toggle$c_reset $c_flag""[-h]$c_reset"
+                echo
+                echo "  Interactive TUI for toggling opinionated component categories."
+                echo "  Changes apply immediately — no confirm step required."
+                echo
+                echo "$c_head""Navigation:$c_reset"
+                echo "  $c_flag↑ ↓$c_reset or $c_flag""k j$c_reset    Move cursor up / down"
+                echo "  $c_flag← →$c_reset or $c_flag""h l$c_reset    Set value: OFF ← DEFAULT → ON"
+                echo "  $c_flag""Tab$c_reset           Switch scope (Universal ↔ Session)"
+                echo "  $c_flag""q$c_reset / $c_flag""Esc$c_reset       Exit"
+                echo
+                echo "$c_head""Scopes:$c_reset"
+                echo "  $c_flag""Universal$c_reset   Persistent across all sessions ($c_dim""set -U$c_reset)"
+                echo "  $c_flag""Session$c_reset     Current session only ($c_dim""set -g$c_reset)"
+                return 0
+            case '*'
+                echo "$c_err""Unknown option: $arg$c_reset" >&2
+                echo "Run $c_cmd""config-toggle --help$c_reset for usage." >&2
+                return 1
+        end
+    end
+
+    # ── Variable list (matches Panel Layout Reference) ────
+    set -l vars \
+        __fish_config_op_aliases \
+        __fish_config_op_autoexec \
+        __fish_config_op_overrides \
+        __fish_config_op_integrations \
+        __fish_config_op_logging \
+        __fish_config_op_greeting \
+        __fish_config_opinionated
+
+    set -l cur_row   0           # 0–6
+    set -l cur_scope universal   # or "session"
+    set -l panel_h   14          # total panel lines
+
+    # ── Terminal setup ────────────────────────────────────
+    printf '\e[?25l'             # hide cursor
+    trap 'printf "\e[?25h"; set -g __config_toggle_exit 1' INT
+
+    # ── Initial draw ──────────────────────────────────────
+    __config_toggle_draw $cur_row $cur_scope $vars
+
+    # ── Event loop ────────────────────────────────────────
+    # __config_toggle_read_key reads a single keypress from /dev/tty in raw
+    # mode and returns a normalized token (up/down/tab/space/escape/quit or a
+    # literal char). It bypasses fish's `read`, whose line editor swallows Tab
+    # and arrow keys and prints a `read> ` prompt — unusable for a TUI.
+    while true
+        # Check for Ctrl-C signal (trap sets this flag during redraw, when the
+        # terminal is briefly back in cooked mode and SIGINT can fire).
+        if set -q __config_toggle_exit
+            set -eg __config_toggle_exit
+            break
+        end
+
+        set -l key (__config_toggle_read_key)
+        or break   # not a TTY — exit instead of spinning
+
+        switch $key
+            case up k
+                set cur_row (math "max(0, $cur_row - 1)")
+            case down j
+                set cur_row (math "min(6, $cur_row + 1)")
+            case tab      # Tab — switch scope
+                if test $cur_scope = universal
+                    set cur_scope session
+                else
+                    set cur_scope universal
+                end
+            case right l   # → / l — step toward ON (clamped, no wrap)
+                set -l varname $vars[(math $cur_row + 1)]
+                set -l cur_val (__config_toggle_get_val $varname $cur_scope)
+
+                # Order: OFF ← DEFAULT → ON
+                set -l next_val on
+                switch $cur_val
+                    case off
+                        set next_val DEFAULT
+                    case on
+                        set next_val on     # already at the right end
+                    case '*'   # DEFAULT or unrecognised
+                        set next_val on
+                end
+                __config_toggle_apply $varname $cur_scope $next_val
+            case left h   # ← / h — step toward OFF (clamped, no wrap)
+                set -l varname $vars[(math $cur_row + 1)]
+                set -l cur_val (__config_toggle_get_val $varname $cur_scope)
+
+                # Order: OFF ← DEFAULT → ON
+                set -l next_val off
+                switch $cur_val
+                    case on
+                        set next_val DEFAULT
+                    case off
+                        set next_val off    # already at the left end
+                    case '*'   # DEFAULT or unrecognised
+                        set next_val off
+                end
+                __config_toggle_apply $varname $cur_scope $next_val
+            case q Q quit escape
+                break
+        end
+
+        # Redraw in place
+        printf '\e[%dA\e[J' $panel_h
+        __config_toggle_draw $cur_row $cur_scope $vars
+    end
+
+    # ── Cleanup ───────────────────────────────────────────
+    trap - INT              # remove the signal handler
+    printf '\e[?25h'        # restore cursor
+end