diff --git a/src/specify_cli/extensions.py b/src/specify_cli/extensions.py
index 4d5bd8083..8f3120dd0 100644
--- a/src/specify_cli/extensions.py
+++ b/src/specify_cli/extensions.py
@@ -623,6 +623,12 @@ class CommandRegistrar:
             "args": "$ARGUMENTS",
             "extension": ".md"
         },
+        "codex": {
+            "dir": ".codex/prompts",
+            "format": "markdown",
+            "args": "$ARGUMENTS",
+            "extension": ".md"
+        },
         "windsurf": {
             "dir": ".windsurf/workflows",
             "format": "markdown",
diff --git a/tests/test_agent_config_consistency.py b/tests/test_agent_config_consistency.py
index cad112cf4..e557724fa 100644
--- a/tests/test_agent_config_consistency.py
+++ b/tests/test_agent_config_consistency.py
@@ -28,6 +28,13 @@ def test_extension_registrar_uses_kiro_cli_and_removes_q(self):
         assert cfg["kiro-cli"]["dir"] == ".kiro/prompts"
         assert "q" not in cfg
 
+    def test_extension_registrar_includes_codex(self):
+        """Extension command registrar should include codex targeting .codex/prompts."""
+        cfg = CommandRegistrar.AGENT_CONFIGS
+
+        assert "codex" in cfg
+        assert cfg["codex"]["dir"] == ".codex/prompts"
+
     def test_release_agent_lists_include_kiro_cli_and_exclude_q(self):
         """Bash and PowerShell release scripts should agree on agent key set for Kiro."""
         sh_text = (REPO_ROOT / ".github" / "workflows" / "scripts" / "create-release-packages.sh").read_text(encoding="utf-8")
diff --git a/tests/test_extensions.py b/tests/test_extensions.py
index 062250b63..04e53bcf4 100644
--- a/tests/test_extensions.py
+++ b/tests/test_extensions.py
@@ -405,6 +405,11 @@ def test_kiro_cli_agent_config_present(self):
         assert CommandRegistrar.AGENT_CONFIGS["kiro-cli"]["dir"] == ".kiro/prompts"
         assert "q" not in CommandRegistrar.AGENT_CONFIGS
 
+    def test_codex_agent_config_present(self):
+        """Codex should be mapped to .codex/prompts."""
+        assert "codex" in CommandRegistrar.AGENT_CONFIGS
+        assert CommandRegistrar.AGENT_CONFIGS["codex"]["dir"] == ".codex/prompts"
+
     def test_parse_frontmatter_valid(self):
         """Test parsing valid YAML frontmatter."""
         content = """---