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_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 = """---