diff --git a/src/specify_cli/integrations/hermes/__init__.py b/src/specify_cli/integrations/hermes/__init__.py
index f4bc43be6e..5d1f3a261b 100644
--- a/src/specify_cli/integrations/hermes/__init__.py
+++ b/src/specify_cli/integrations/hermes/__init__.py
@@ -253,6 +253,11 @@ def build_exec_args(
         """
         args = [self._resolve_executable(), "chat", "-Q"]
 
+        # Operator-supplied SPECKIT_INTEGRATION_HERMES_EXTRA_ARGS go here —
+        # after the base command but before Spec Kit's canonical -m/--json/-s/-q
+        # flags — so they can't displace or clobber them (mirrors opencode).
+        self._apply_extra_args_env_var(args)
+
         if model:
             args.extend(["-m", model])
         if output_json:
diff --git a/tests/integrations/test_integration_hermes.py b/tests/integrations/test_integration_hermes.py
index 521a310cb8..b2106050b7 100644
--- a/tests/integrations/test_integration_hermes.py
+++ b/tests/integrations/test_integration_hermes.py
@@ -353,3 +353,38 @@ def test_integration_hermes_creates_global_skills(self, tmp_path, monkeypatch):
             if "agent-context" not in d.name
         ]
         assert local_skills == [], f"Local skills dir should be empty, got: {local_skills}"
+
+
+class TestHermesBuildExecArgs:
+    """CLI dispatch argv, including the operator extra-args env hook."""
+
+    def test_build_exec_args_default_shape(self):
+        i = get_integration("hermes")
+        assert i.build_exec_args("/speckit-plan hi", output_json=True) == [
+            "hermes", "chat", "-Q", "--json", "-s", "speckit-plan", "-q", "hi",
+        ]
+
+    def test_build_exec_args_honors_extra_args(self, monkeypatch):
+        """SPECKIT_INTEGRATION_HERMES_EXTRA_ARGS is injected before the
+        canonical -m/--json/-s/-q flags (same env hook as codex/opencode/
+        devin; hermes previously skipped _apply_extra_args_env_var entirely).
+        """
+        monkeypatch.setenv(
+            "SPECKIT_INTEGRATION_HERMES_EXTRA_ARGS", "--temperature 0.2"
+        )
+        i = get_integration("hermes")
+        args = i.build_exec_args("/speckit-plan hi", output_json=True)
+        assert args == [
+            "hermes", "chat", "-Q", "--temperature", "0.2",
+            "--json", "-s", "speckit-plan", "-q", "hi",
+        ]
+        # Injected before the canonical flags so it can't displace them.
+        assert args.index("--temperature") < args.index("--json")
+        assert args.index("--temperature") < args.index("-s")
+
+    def test_build_exec_args_honors_executable_override(self, monkeypatch):
+        monkeypatch.setenv(
+            "SPECKIT_INTEGRATION_HERMES_EXECUTABLE", "/custom/hermes"
+        )
+        i = get_integration("hermes")
+        assert i.build_exec_args("/speckit-plan hi")[0] == "/custom/hermes"