diff --git a/functions/config-toggle.fish b/functions/config-toggle.fish
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+++ b/functions/config-toggle.fish
@@ -0,0 +1,61 @@
+# 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