diff --git a/.gitea/workflows/t3code-update.yml b/.gitea/workflows/t3code-update.yml
new file mode 100644
index 0000000..43db10d
--- /dev/null
+++ b/.gitea/workflows/t3code-update.yml
@@ -0,0 +1,70 @@
+name: t3code update
+
+on:
+  schedule:
+    - cron: "50 6 * * *"
+  workflow_dispatch:
+
+jobs:
+  update-t3code:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: install nix
+        uses: cachix/install-nix-action@v27
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - name: check latest t3code release and update file
+        id: update
+        env:
+          FILE: modules/pkgs/t3code.nix
+          LATEST_RELEASE_URL: https://github.com/pingdotgg/t3code/releases/latest
+          DOWNLOAD_URL_TEMPLATE: https://github.com/pingdotgg/t3code/releases/download/v{version}/T3-Code-{version}-x86_64.AppImage
+          RELEASE_TAG_TEMPLATE: v{version}
+        shell: bash
+        run: bash .gitea/scripts/update-appimage-nix.sh
+
+      - name: create branch and commit
+        if: steps.update.outputs.updated == 'true'
+        shell: bash
+        run: |
+          set -euo pipefail
+          version="${{ steps.update.outputs.version }}"
+
+          BRANCH="bot/t3code-${version}" \
+          FILE="modules/pkgs/t3code.nix" \
+          COMMIT_MESSAGE="update t3code to ${version}" \
+          bash .gitea/scripts/commit-update.sh
+
+      - name: open pull request
+        if: steps.update.outputs.updated == 'true'
+        env:
+          GITEA_TOKEN: ${{ secrets.tea_token || secrets.TEA_TOKEN }}
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          version="${{ steps.update.outputs.version }}"
+          previous_version="${{ steps.update.outputs.previous_version }}"
+          release_url="${{ steps.update.outputs.release_url }}"
+
+          pr_body=$(cat <<EOF
+          automated update of t3code appimage version and hash
+
+          ## changelog
+          from \`${previous_version}\` to \`${version}\`
+
+          upstream release: ${release_url}
+          EOF
+          )
+
+          GITEA_API="https://gitea.unrail.xyz/api/v1/repos/thomas/nixos-config" \
+          BRANCH="bot/t3code-${version}" \
+          TITLE="update t3code to ${version}" \
+          BODY="$pr_body" \
+          bash .gitea/scripts/create-gitea-pr.sh
diff --git a/flake.lock b/flake.lock
index 48c521a..9149010 100644
--- a/flake.lock
+++ b/flake.lock
@@ -86,11 +86,11 @@
     },
     "import-tree": {
       "locked": {
-        "lastModified": 1772999353,
-        "narHash": "sha256-dPb0WxUhFaz6wuR3B6ysqFJpsu8txKDPZvS47AT2XLI=",
+        "lastModified": 1773693634,
+        "narHash": "sha256-BtZ2dtkBdSUnFPPFc+n0kcMbgaTxzFNPv2iaO326Ffg=",
         "owner": "vic",
         "repo": "import-tree",
-        "rev": "545a4df146fce44d155573e47f5a777985acf912",
+        "rev": "c41e7d58045f9057880b0d85e1152d6a4430dbf1",
         "type": "github"
       },
       "original": {
@@ -117,11 +117,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1772773019,
-        "narHash": "sha256-E1bxHxNKfDoQUuvriG71+f+s/NT0qWkImXsYZNFFfCs=",
+        "lastModified": 1773821835,
+        "narHash": "sha256-TJ3lSQtW0E2JrznGVm8hOQGVpXjJyXY2guAxku2O9A4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "aca4d95fce4914b3892661bcb80b8087293536c6",
+        "rev": "b40629efe5d6ec48dd1efba650c797ddbd39ace0",
         "type": "github"
       },
       "original": {
diff --git a/modules/development.nix b/modules/development.nix
index e3cc43a..8b4908b 100644
--- a/modules/development.nix
+++ b/modules/development.nix
@@ -13,6 +13,7 @@
       pnpm
       ni
       code-cursor-fhs
+      codex
 
       # LSPs and formatters (previously via Mason)
       stylua
diff --git a/modules/packages.nix b/modules/packages.nix
index 133ac06..2b446ba 100644
--- a/modules/packages.nix
+++ b/modules/packages.nix
@@ -20,6 +20,7 @@
       feishin
       obsidian
       self.packages.${pkgs.stdenv.hostPlatform.system}.handy
+      self.packages.${pkgs.stdenv.hostPlatform.system}.t3code
       mpv
       ffmpeg
       tmux
diff --git a/modules/pkgs/t3code.nix b/modules/pkgs/t3code.nix
new file mode 100644
index 0000000..623cf66
--- /dev/null
+++ b/modules/pkgs/t3code.nix
@@ -0,0 +1,37 @@
+{lib, ...}: {
+  perSystem = {pkgs, ...}: {
+    packages.t3code = pkgs.appimageTools.wrapType2 rec {
+      pname = "t3code";
+      version = "0.0.13";
+
+      src = pkgs.fetchurl {
+        url = "https://github.com/pingdotgg/t3code/releases/download/v${version}/T3-Code-${version}-x86_64.AppImage";
+        hash = "sha256-oHKIh+aHsbGVHEoLLjItl6AbVRwvWVlZaIWyHKiekVc=";
+      };
+
+      extraInstallCommands = let
+        contents = pkgs.appimageTools.extract {inherit pname version src;};
+      in ''
+        desktop_file=$(find ${contents} -name "*.desktop" | head -n1)
+        if [ -n "$desktop_file" ]; then
+          install -m 444 -D "$desktop_file" "$out/share/applications/${pname}.desktop"
+          substituteInPlace "$out/share/applications/${pname}.desktop" \
+            --replace 'Exec=AppRun' 'Exec=${pname}' \
+            --replace 'Exec=T3-Code' 'Exec=${pname}' \
+            --replace 'Exec=t3-code' 'Exec=${pname}' || true
+        fi
+
+        if [ -d ${contents}/usr/share/icons ]; then
+          cp -r ${contents}/usr/share/icons $out/share
+        fi
+      '';
+
+      meta = {
+        description = "T3 Chat Desktop";
+        homepage = "https://t3.codes";
+        license = lib.licenses.mit;
+        platforms = ["x86_64-linux"];
+      };
+    };
+  };
+}