diff --git a/bin/omarchy-install-ai-t3-code b/bin/omarchy-install-ai-t3-code
new file mode 100755
index 00000000..b9e3af38
--- /dev/null
+++ b/bin/omarchy-install-ai-t3-code
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# omarchy:summary=Install T3 Code and point it at the Omarchy palette
+# omarchy:requires-sudo=true
+
+set -e
+
+T3CODE_HOME="${T3CODE_HOME:-$HOME/.t3}"
+T3CODE_STATE_DIR="$T3CODE_HOME/userdata"
+
+echo "Installing T3 Code..."
+omarchy-pkg-add t3code-bin
+
+echo "Matching T3 Code to the current theme..."
+mkdir -p "$T3CODE_STATE_DIR"
+
+# An updated user's current theme may have been staged before this template existed.
+if [[ ! -f $HOME/.local/state/omarchy/current/theme/t3code.json ]]; then
+  omarchy-theme-refresh
+fi
+
+omarchy-theme-set-t3code
+
+# The packaged CLI selects the published palette before the app's first launch.
+t3 theme set omarchy --base-dir "$T3CODE_HOME"
+
+echo "Opening T3 Code..."
+setsid uwsm-app -- gtk-launch t3code >/dev/null 2>&1 &
+
+echo ""
+echo "T3 Code has been installed."
diff --git a/bin/omarchy-theme-set b/bin/omarchy-theme-set
index 614a8a1b..782b4ba7 100755
--- a/bin/omarchy-theme-set
+++ b/bin/omarchy-theme-set
@@ -372,6 +372,7 @@ post_theme_commands=(
   omarchy-theme-set-pi
   omarchy-theme-set-claude
   omarchy-theme-set-hermes
+  omarchy-theme-set-t3code
   omarchy-theme-set-browser
   omarchy-theme-set-vscode
   omarchy-theme-set-obsidian
diff --git a/bin/omarchy-theme-set-t3code b/bin/omarchy-theme-set-t3code
new file mode 100755
index 00000000..7b6f69bf
--- /dev/null
+++ b/bin/omarchy-theme-set-t3code
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# omarchy:summary=Sync the generated Omarchy theme to T3 Code
+# omarchy:hidden=true
+
+set -euo pipefail
+
+T3CODE_SOURCE_PATH="$HOME/.local/state/omarchy/current/theme/t3code.json"
+T3CODE_HOME="${T3CODE_HOME:-$HOME/.t3}"
+T3CODE_STATE_DIR="$T3CODE_HOME/userdata"
+# The filename is the theme id T3 Code shows and `t3 theme set` accepts, and
+# it stays stable while the colors change underneath on every theme switch.
+T3CODE_THEME_PATH="$T3CODE_STATE_DIR/themes/omarchy.json"
+
+[[ -f $T3CODE_SOURCE_PATH ]] || exit 0
+
+# A theme without an accent or a background leaves its placeholder unresolved.
+# Publishing that would only make T3 Code reject the file, so skip instead and
+# leave the previous palette in place.
+if grep -q '{{' "$T3CODE_SOURCE_PATH"; then
+  echo "Skipping T3 Code theme: $(basename "$T3CODE_SOURCE_PATH") has unresolved colors." >&2
+  exit 0
+fi
+
+# Only follow an install that already exists. Creating the directory here would
+# leave a stray T3 Code state dir on machines that do not run it.
+[[ -d $T3CODE_STATE_DIR ]] || exit 0
+
+# T3 Code watches this file and retints every connected client on change, so
+# the write has to be atomic: a half-written file would read as invalid.
+mkdir -p "$(dirname "$T3CODE_THEME_PATH")"
+tmp=$(mktemp "$T3CODE_THEME_PATH.XXXXXX")
+cp "$T3CODE_SOURCE_PATH" "$tmp"
+mv "$tmp" "$T3CODE_THEME_PATH"
diff --git a/default/omarchy/omarchy-menu.jsonc b/default/omarchy/omarchy-menu.jsonc
index 0e590652..745ec311 100644
--- a/default/omarchy/omarchy-menu.jsonc
+++ b/default/omarchy/omarchy-menu.jsonc
@@ -248,7 +248,7 @@
   "install.ai.ollama": {"icon":"","iconFont":"omarchy","label":"Ollama","disabled":"omarchy-cmd-present ollama","action":"if omarchy-cmd-present nvidia-smi; then ollama_pkg=ollama-cuda; elif omarchy-cmd-present rocminfo; then ollama_pkg=ollama-rocm; else ollama_pkg=ollama; fi; omarchy-install-app Ollama \"$ollama_pkg\""},
   "install.ai.openclaw": {"icon":"","iconFont":"omarchy","label":"OpenClaw","disabled":"omarchy-pkg-present openclaw","action":"omarchy-launch-floating-terminal-with-presentation omarchy-install-ai-openclaw"},
   "install.ai.perplexity": {"icon":"","iconFont":"omarchy","label":"Perplexity","disabled":"omarchy-pkg-present perplexity","action":"omarchy-install-and-launch Perplexity perplexity perplexity"},
-  "install.ai.t3-code": {"icon":"","iconFont":"omarchy","label":"T3 Code","disabled":"omarchy-pkg-present t3code-bin","action":"omarchy-install-and-launch 'T3 Code' t3code-bin t3code"},
+  "install.ai.t3-code": {"icon":"","iconFont":"omarchy","label":"T3 Code","disabled":"omarchy-pkg-present t3code-bin","action":"omarchy-launch-floating-terminal-with-presentation omarchy-install-ai-t3-code"},
   "install.gaming.steam": {"icon":"","label":"Steam","disabled":"omarchy-pkg-present steam","action":"omarchy-launch-floating-terminal-with-presentation omarchy-install-gaming-steam"},
   "install.gaming.retroarch": {"icon":"󰯉","label":"RetroArch","disabled":"omarchy-pkg-present retroarch","action":"omarchy-launch-floating-terminal-with-presentation omarchy-install-gaming-retroarch"},
   "install.gaming.minecraft": {"icon":"󰍳","label":"Minecraft","disabled":"omarchy-pkg-present minecraft-launcher","action":"omarchy-install-and-launch Minecraft minecraft-launcher minecraft-launcher"},
diff --git a/default/themed/t3code.json.tpl b/default/themed/t3code.json.tpl
new file mode 100644
index 00000000..e420dcc4
--- /dev/null
+++ b/default/themed/t3code.json.tpl
@@ -0,0 +1,36 @@
+{
+  "name": "Omarchy",
+  "appearance": "{{ mode }}",
+  "canvas": "{{ background }}",
+  "accent": "{{ accent }}",
+  "colors": {
+    "chrome": "{{ background }}",
+    "toolbar": "{{ background }}",
+    "toolbarForeground": "{{ foreground }}",
+    "toolbarBorder": "{{ muted }}",
+
+    "text": "{{ foreground }}",
+    "border": "{{ muted }}",
+    "focus": "{{ accent }}",
+
+    "sidebar": "{{ dark_background }}",
+    "sidebarForeground": "{{ foreground }}",
+    "sidebarBorder": "{{ muted }}",
+    "sidebarRowHover": "{{ mix dark_background foreground 6% }}",
+    "sidebarRowActive": "{{ mix dark_background accent 18% }}",
+    "sidebarRowSelected": "{{ selection }}",
+
+    "error": "{{ mix red foreground 35% }}",
+    "warning": "{{ mix yellow foreground 35% }}",
+
+    "codeBackground": "{{ dark_background }}",
+    "codeForeground": "{{ foreground }}",
+
+    "terminalBackground": "{{ background }}",
+    "terminalForeground": "{{ foreground }}",
+    "terminalCursor": "{{ bright_foreground }}",
+    "terminalSelection": "{{ selection }}",
+    "terminalScrollbar": "{{ muted }}",
+    "terminalScrollbarHover": "{{ dark_foreground }}"
+  }
+}
diff --git a/test/shell.d/t3code-install-test.sh b/test/shell.d/t3code-install-test.sh
new file mode 100755
index 00000000..66bc9ecd
--- /dev/null
+++ b/test/shell.d/t3code-install-test.sh
@@ -0,0 +1,81 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+
+test_home="$test_tmp/home"
+mock_bin="$test_tmp/bin"
+mkdir -p "$mock_bin"
+
+# Run the real theme refresh, renderer and publisher in a throwaway home.
+# Only package installation, the T3 CLI and desktop launch are stubbed.
+cat >"$mock_bin/omarchy-pkg-add" <<'SH'
+#!/bin/bash
+[[ $1 == "t3code-bin" ]]
+SH
+
+cat >"$mock_bin/t3" <<'SH'
+#!/bin/bash
+[[ $1 == "theme" && $2 == "set" && $3 == "omarchy" && $4 == "--base-dir" && $5 == "$T3CODE_HOME" ]] || exit 1
+palette="$T3CODE_HOME/userdata/themes/omarchy.json"
+if [[ ! -f $palette ]] || ! jq -e '.name == "Omarchy" and (.accent | test("^#[0-9a-fA-F]{6}$"))' "$palette" >/dev/null; then
+  echo "No published Omarchy theme"
+  exit 1
+fi
+if [[ ${OMARCHY_TEST_T3_FAIL:-0} == "1" ]]; then
+  echo "T3 theme selection failed"
+  exit 1
+fi
+echo "T3 selected Omarchy"
+SH
+
+cat >"$mock_bin/setsid" <<'SH'
+#!/bin/bash
+exit 0
+SH
+chmod +x "$mock_bin"/*
+
+run_installer() {
+  HOME="$test_home" T3CODE_HOME="$test_tmp/custom t3 home" \
+    OMARCHY_PATH="$ROOT" PATH="$mock_bin:$ROOT/bin:$PATH" \
+    OMARCHY_THEME_HEADLESS=1 XDG_RUNTIME_DIR="$test_tmp" \
+    "$ROOT/bin/omarchy-install-ai-t3-code" >"$test_tmp/output" 2>&1
+}
+
+state="$test_home/.local/state/omarchy/current"
+palette="$test_tmp/custom t3 home/userdata/themes/omarchy.json"
+settings="$test_tmp/custom t3 home/userdata/settings.json"
+mkdir -p "$state/theme"
+echo 'tokyo-night' >"$state/theme.name"
+cp "$ROOT/themes/tokyo-night/colors.toml" "$state/theme/colors.toml"
+
+run_installer || fail "installing after an update succeeds" "$(cat "$test_tmp/output")"
+[[ -f $state/theme/t3code.json && -f $palette ]] || fail "the missing palette is rendered and published"
+cmp -s "$state/theme/t3code.json" "$palette" || fail "T3 receives the current theme's palette"
+grep -q 'T3 selected Omarchy' "$test_tmp/output" || fail "the published palette is selected"
+grep -q 'Opening T3 Code' "$test_tmp/output" || fail "the themed app opens"
+[[ ! -e $test_home/.t3 ]] || fail "the custom T3 home is respected"
+pass "an update with no staged T3 palette renders, publishes and selects it before launch"
+
+# Preserve an already rendered palette, including a user-supplied color.
+jq '.accent = "#abcdef"' "$state/theme/t3code.json" >"$test_tmp/palette.json"
+cp "$test_tmp/palette.json" "$state/theme/t3code.json"
+run_installer || fail "installing with an existing palette succeeds" "$(cat "$test_tmp/output")"
+cmp -s "$test_tmp/palette.json" "$palette" || fail "an existing palette is published without re-staging"
+pass "an existing palette is used without refreshing the current theme"
+
+printf '{"defaultTheme":"dark","keep":"existing settings"}\n' >"$settings"
+cp "$settings" "$test_tmp/settings-before.json"
+if OMARCHY_TEST_T3_FAIL=1 run_installer; then
+  fail "a failed T3 theme selection fails the installer"
+fi
+grep -q 'T3 theme selection failed' "$test_tmp/output" || fail "the CLI failure is visible"
+if grep -Eq 'Opening T3 Code|T3 Code has been installed' "$test_tmp/output"; then
+  fail "a failed selection does not report successful setup"
+fi
+cmp -s "$test_tmp/settings-before.json" "$settings" || fail "a failed selection does not rewrite settings"
+pass "a CLI failure remains visible and leaves the existing settings intact"
diff --git a/test/shell.d/theme-staging-test.sh b/test/shell.d/theme-staging-test.sh
index 9ec3b0f9..1fc7a4a5 100755
--- a/test/shell.d/theme-staging-test.sh
+++ b/test/shell.d/theme-staging-test.sh
@@ -207,7 +207,7 @@ pass "a theme name cannot climb out of the theme directories"
 # generates. Every generated theme file is either denied to an installed theme or
 # recorded here as carrying colour, so a new template fails until it is placed.
 denied=(alacritty.toml foot.ini ghostty.conf kitty.conf gum_env.lua hyprland.lua neovim.lua vscode.json)
-colour_only=(btop.theme chromium.theme claude.json helix.toml hermes.yaml hyprland-preview-share-picker.css keyboard.rgb obsidian.css pi.json shell.toml vscode-theme.json)
+colour_only=(btop.theme chromium.theme claude.json helix.toml hermes.yaml hyprland-preview-share-picker.css keyboard.rgb obsidian.css pi.json shell.toml t3code.json vscode-theme.json)
 
 for tpl in "$ROOT"/default/themed/*.tpl; do
   generated=$(basename "$tpl" .tpl)