diff --git a/pyproject.toml b/pyproject.toml
index 1418df6d8..4b7e8816a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -78,6 +78,15 @@ termux = [
 ]
 dingtalk = ["dingtalk-stream>=0.20,<1", "alibabacloud-dingtalk>=2.0.0", "qrcode>=7.0,<8"]
 feishu = ["lark-oapi>=1.5.3,<2", "qrcode>=7.0,<8"]
+google = [
+  # Required by the google-workspace skill (Gmail, Calendar, Drive, Contacts,
+  # Sheets, Docs).  Declared here so packagers (Nix, Homebrew) ship them with
+  # the [all] extra and users don't hit runtime `pip install` paths that fail
+  # in environments without pip (e.g. Nix-managed Python).
+  "google-api-python-client>=2.100,<3",
+  "google-auth-oauthlib>=1.0,<2",
+  "google-auth-httplib2>=0.2,<1",
+]
 # `hermes dashboard` (localhost SPA + API).  Not in core to keep the default install lean.
 web = ["fastapi>=0.104.0,<1", "uvicorn[standard]>=0.24.0,<1"]
 rl = [
@@ -110,6 +119,7 @@ all = [
   "hermes-agent[voice]",
   "hermes-agent[dingtalk]",
   "hermes-agent[feishu]",
+  "hermes-agent[google]",
   "hermes-agent[mistral]",
   "hermes-agent[bedrock]",
   "hermes-agent[web]",
diff --git a/skills/productivity/google-workspace/scripts/setup.py b/skills/productivity/google-workspace/scripts/setup.py
index 70d7b0a10..851d8911b 100644
--- a/skills/productivity/google-workspace/scripts/setup.py
+++ b/skills/productivity/google-workspace/scripts/setup.py
@@ -21,6 +21,8 @@ Agent workflow:
   6. Run --check to verify. Done.
 """
 
+from __future__ import annotations  # allow PEP 604 `X | None` on Python 3.9+
+
 import argparse
 import json
 import os
@@ -110,7 +112,11 @@ def install_deps():
         return True
     except subprocess.CalledProcessError as e:
         print(f"ERROR: Failed to install dependencies: {e}")
-        print(f"Try manually: {sys.executable} -m pip install {' '.join(REQUIRED_PACKAGES)}")
+        print(
+            "On environments without pip (e.g. Nix), install the optional extra instead:"
+        )
+        print("  pip install 'hermes-agent[google]'")
+        print(f"Or manually: {sys.executable} -m pip install {' '.join(REQUIRED_PACKAGES)}")
         return False