diff --git a/tests/tools/test_browser_camofox_auth.py b/tests/tools/test_browser_camofox_auth.py
new file mode 100644
index 00000000000..590bea47028
--- /dev/null
+++ b/tests/tools/test_browser_camofox_auth.py
@@ -0,0 +1,111 @@
+"""Tests that Camofox browser sends Authorization header when CAMOFOX_API_KEY is set.
+
+Regression test for https://github.com/NousResearch/hermes-agent/issues/20476
+"""
+
+import json
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from tools.browser_camofox import (
+    _auth_headers,
+    camofox_back,
+    camofox_click,
+    camofox_close,
+    camofox_navigate,
+    camofox_press,
+    camofox_scroll,
+    camofox_snapshot,
+    camofox_type,
+)
+
+
+def _mock_response(status=200, json_data=None):
+    resp = MagicMock()
+    resp.status_code = status
+    resp.json.return_value = json_data or {}
+    resp.content = b"\x89PNG\r\n\x1a\nfake"
+    resp.raise_for_status = MagicMock()
+    return resp
+
+
+class TestAuthHeaders:
+    """Unit tests for _auth_headers() helper."""
+
+    def test_empty_when_no_key(self, monkeypatch):
+        monkeypatch.delenv("CAMOFOX_API_KEY", raising=False)
+        assert _auth_headers() == {}
+
+    def test_bearer_when_key_set(self, monkeypatch):
+        monkeypatch.setenv("CAMOFOX_API_KEY", "test-secret-123")
+        assert _auth_headers() == {"Authorization": "Bearer test-secret-123"}
+
+    def test_empty_when_key_blank(self, monkeypatch):
+        monkeypatch.setenv("CAMOFOX_API_KEY", "   ")
+        assert _auth_headers() == {}
+
+
+class TestAuthHeadersSent:
+    """Verify all HTTP call sites include auth headers when CAMOFOX_API_KEY is set."""
+
+    @pytest.fixture(autouse=True)
+    def _set_key(self, monkeypatch):
+        monkeypatch.setenv("CAMOFOX_URL", "http://localhost:9377")
+        monkeypatch.setenv("CAMOFOX_API_KEY", "my-api-key")
+
+    @patch("tools.browser_camofox.requests.post")
+    def test_ensure_tab_sends_auth(self, mock_post):
+        mock_post.return_value = _mock_response(json_data={"tabId": "t1"})
+        camofox_navigate("https://example.com", task_id="auth_test_1")
+        _, kwargs = mock_post.call_args
+        assert kwargs["headers"] == {"Authorization": "Bearer my-api-key"}
+
+    @patch("tools.browser_camofox.requests.post")
+    def test_post_sends_auth(self, mock_post):
+        mock_post.return_value = _mock_response(json_data={"tabId": "t2"})
+        camofox_navigate("https://example.com", task_id="auth_test_2")
+        mock_post.return_value = _mock_response(json_data={"ok": True, "url": "https://x.com"})
+        camofox_navigate("https://x.com", task_id="auth_test_2")
+        # The second call is a POST to /tabs/{tabId}/navigate
+        last_call = mock_post.call_args_list[-1]
+        assert last_call.kwargs.get("headers") == {"Authorization": "Bearer my-api-key"}
+
+    @patch("tools.browser_camofox.requests.post")
+    @patch("tools.browser_camofox.requests.get")
+    def test_get_sends_auth(self, mock_get, mock_post):
+        mock_post.return_value = _mock_response(json_data={"tabId": "t3"})
+        camofox_navigate("https://example.com", task_id="auth_test_3")
+        mock_get.return_value = _mock_response(json_data={
+            "snapshot": '- heading "Hello"',
+            "refsCount": 1,
+        })
+        camofox_snapshot(task_id="auth_test_3")
+        _, kwargs = mock_get.call_args
+        assert kwargs["headers"] == {"Authorization": "Bearer my-api-key"}
+
+    @patch("tools.browser_camofox.requests.post")
+    @patch("tools.browser_camofox.requests.delete")
+    def test_delete_sends_auth(self, mock_delete, mock_post):
+        mock_post.return_value = _mock_response(json_data={"tabId": "t4"})
+        camofox_navigate("https://example.com", task_id="auth_test_4")
+        mock_delete.return_value = _mock_response(json_data={"ok": True})
+        camofox_close(task_id="auth_test_4")
+        _, kwargs = mock_delete.call_args
+        assert kwargs["headers"] == {"Authorization": "Bearer my-api-key"}
+
+
+class TestNoAuthHeadersWhenKeyUnset:
+    """Verify HTTP calls send empty headers when CAMOFOX_API_KEY is not set."""
+
+    @pytest.fixture(autouse=True)
+    def _unset_key(self, monkeypatch):
+        monkeypatch.setenv("CAMOFOX_URL", "http://localhost:9377")
+        monkeypatch.delenv("CAMOFOX_API_KEY", raising=False)
+
+    @patch("tools.browser_camofox.requests.post")
+    def test_no_auth_on_tab_creation(self, mock_post):
+        mock_post.return_value = _mock_response(json_data={"tabId": "t5"})
+        camofox_navigate("https://example.com", task_id="noauth_test_1")
+        _, kwargs = mock_post.call_args
+        assert kwargs.get("headers") == {}
diff --git a/tools/browser_camofox.py b/tools/browser_camofox.py
index 1ac1a41fe30..717e0420d06 100644
--- a/tools/browser_camofox.py
+++ b/tools/browser_camofox.py
@@ -52,6 +52,14 @@ _vnc_url: Optional[str] = None  # cached from /health response
 _vnc_url_checked = False  # only probe once per process
 
 
+def _auth_headers() -> Dict[str, str]:
+    """Return Authorization header when CAMOFOX_API_KEY is set."""
+    key = os.getenv("CAMOFOX_API_KEY", "").strip()
+    if key:
+        return {"Authorization": f"Bearer {key}"}
+    return {}
+
+
 def get_camofox_url() -> str:
     """Return the configured Camofox server URL, or empty string."""
     return os.getenv("CAMOFOX_URL", "").rstrip("/")
@@ -349,6 +357,7 @@ def _ensure_tab(task_id: Optional[str], url: str = "about:blank") -> Dict[str, A
             "url": url,
         },
         timeout=_DEFAULT_TIMEOUT,
+        headers=_auth_headers(),
     )
     resp.raise_for_status()
     data = resp.json()
@@ -387,7 +396,7 @@ def camofox_soft_cleanup(task_id: Optional[str] = None) -> bool:
 def _post(path: str, body: dict, timeout: int = _DEFAULT_TIMEOUT) -> dict:
     """POST JSON to camofox and return parsed response."""
     url = f"{get_camofox_url()}{path}"
-    resp = requests.post(url, json=body, timeout=timeout)
+    resp = requests.post(url, json=body, timeout=timeout, headers=_auth_headers())
     resp.raise_for_status()
     return resp.json()
 
@@ -395,7 +404,7 @@ def _post(path: str, body: dict, timeout: int = _DEFAULT_TIMEOUT) -> dict:
 def _get(path: str, params: dict = None, timeout: int = _DEFAULT_TIMEOUT) -> dict:
     """GET from camofox and return parsed response."""
     url = f"{get_camofox_url()}{path}"
-    resp = requests.get(url, params=params, timeout=timeout)
+    resp = requests.get(url, params=params, timeout=timeout, headers=_auth_headers())
     resp.raise_for_status()
     return resp.json()
 
@@ -403,7 +412,7 @@ def _get(path: str, params: dict = None, timeout: int = _DEFAULT_TIMEOUT) -> dic
 def _get_raw(path: str, params: dict = None, timeout: int = _DEFAULT_TIMEOUT) -> requests.Response:
     """GET from camofox and return raw response (for binary data)."""
     url = f"{get_camofox_url()}{path}"
-    resp = requests.get(url, params=params, timeout=timeout)
+    resp = requests.get(url, params=params, timeout=timeout, headers=_auth_headers())
     resp.raise_for_status()
     return resp
 
@@ -411,7 +420,7 @@ def _get_raw(path: str, params: dict = None, timeout: int = _DEFAULT_TIMEOUT) ->
 def _delete(path: str, body: dict = None, timeout: int = _DEFAULT_TIMEOUT) -> dict:
     """DELETE to camofox and return parsed response."""
     url = f"{get_camofox_url()}{path}"
-    resp = requests.delete(url, json=body, timeout=timeout)
+    resp = requests.delete(url, json=body, timeout=timeout, headers=_auth_headers())
     resp.raise_for_status()
     return resp.json()