chore: add codex

agents/install-cli.md

@@ -4,19 +4,19 @@ Reference commands for installing and updating agent CLIs. Run only the commands
 
 ## Install CLIs
 
+Installed via Nix:
+
+- codex
+- cursor-cli
+- claude-code
+- gemini-cli
+
+Install Manually:
+
 ```bash
-# codex
-npm i -g @openai/codex
-
-# opencode
-npm install -g opencode-ai
-
 # kimi-cli
 uv tool install --python 3.13 kimi-cli
 uv tool upgrade kimi-cli --no-cache
-
-# gemini-cli
-npm install -g @google/gemini-cli
 ```
 
 ## Optional tooling

home/base/gui/dev-tools.nix

@@ -8,6 +8,7 @@
     ]
     # AI Agent Tools
     ++ (with pkgs-master; [
+      codex
       cursor-cli
       claude-code
       gemini-cli