fix(auth): add cross-service Drive scopes for docs and sheets tools

auth/scopes.py

@@ -84,7 +84,12 @@
 BASE_SCOPES = [USERINFO_EMAIL_SCOPE, USERINFO_PROFILE_SCOPE, OPENID_SCOPE]
 
 # Service-specific scope groups
-DOCS_SCOPES = [DOCS_READONLY_SCOPE, DOCS_WRITE_SCOPE]
+DOCS_SCOPES = [
+    DOCS_READONLY_SCOPE,
+    DOCS_WRITE_SCOPE,
+    DRIVE_READONLY_SCOPE,
+    DRIVE_FILE_SCOPE,
+]
 
 CALENDAR_SCOPES = [CALENDAR_SCOPE, CALENDAR_READONLY_SCOPE, CALENDAR_EVENTS_SCOPE]
 
@@ -101,7 +106,7 @@
 
 CHAT_SCOPES = [CHAT_READONLY_SCOPE, CHAT_WRITE_SCOPE, CHAT_SPACES_SCOPE]
 
-SHEETS_SCOPES = [SHEETS_READONLY_SCOPE, SHEETS_WRITE_SCOPE]
+SHEETS_SCOPES = [SHEETS_READONLY_SCOPE, SHEETS_WRITE_SCOPE, DRIVE_READONLY_SCOPE]
 
 FORMS_SCOPES = [
     FORMS_BODY_SCOPE,
@@ -148,8 +153,8 @@
     "gmail": [GMAIL_READONLY_SCOPE],
     "drive": [DRIVE_READONLY_SCOPE],
     "calendar": [CALENDAR_READONLY_SCOPE],
-    "docs": [DOCS_READONLY_SCOPE],
-    "sheets": [SHEETS_READONLY_SCOPE],
+    "docs": [DOCS_READONLY_SCOPE, DRIVE_READONLY_SCOPE],
+    "sheets": [SHEETS_READONLY_SCOPE, DRIVE_READONLY_SCOPE],
     "chat": [CHAT_READONLY_SCOPE],
     "forms": [FORMS_BODY_READONLY_SCOPE, FORMS_RESPONSES_READONLY_SCOPE],
     "slides": [SLIDES_READONLY_SCOPE],

tests/test_scopes.py

@@ -0,0 +1,95 @@
+"""
+Unit tests for cross-service scope generation.
+
+Verifies that docs and sheets tools automatically include the Drive scopes
+they need for operations like search_docs, list_docs_in_folder,
+export_doc_to_pdf, and list_spreadsheets — without requiring --tools drive.
+"""
+
+import sys
+import os
+
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+from auth.scopes import (
+    DRIVE_FILE_SCOPE,
+    DRIVE_READONLY_SCOPE,
+    DRIVE_SCOPE,
+    get_scopes_for_tools,
+    set_read_only,
+)
+
+
+class TestDocsScopes:
+    """Tests for docs tool scope generation."""
+
+    def test_docs_includes_drive_readonly(self):
+        """search_docs, get_doc_content, list_docs_in_folder need drive.readonly."""
+        scopes = get_scopes_for_tools(["docs"])
+        assert DRIVE_READONLY_SCOPE in scopes
+
+    def test_docs_includes_drive_file(self):
+        """export_doc_to_pdf needs drive.file to create the PDF."""
+        scopes = get_scopes_for_tools(["docs"])
+        assert DRIVE_FILE_SCOPE in scopes
+
+    def test_docs_does_not_include_full_drive(self):
+        """docs should NOT request full drive access."""
+        scopes = get_scopes_for_tools(["docs"])
+        assert DRIVE_SCOPE not in scopes
+
+
+class TestSheetsScopes:
+    """Tests for sheets tool scope generation."""
+
+    def test_sheets_includes_drive_readonly(self):
+        """list_spreadsheets needs drive.readonly."""
+        scopes = get_scopes_for_tools(["sheets"])
+        assert DRIVE_READONLY_SCOPE in scopes
+
+    def test_sheets_does_not_include_full_drive(self):
+        """sheets should NOT request full drive access."""
+        scopes = get_scopes_for_tools(["sheets"])
+        assert DRIVE_SCOPE not in scopes
+
+
+class TestCombinedScopes:
+    """Tests for combined tool scope generation."""
+
+    def test_docs_sheets_no_duplicate_drive_readonly(self):
+        """Combined docs+sheets should deduplicate drive.readonly."""
+        scopes = get_scopes_for_tools(["docs", "sheets"])
+        assert scopes.count(DRIVE_READONLY_SCOPE) <= 1
+
+    def test_docs_sheets_returns_unique_scopes(self):
+        """All returned scopes should be unique."""
+        scopes = get_scopes_for_tools(["docs", "sheets"])
+        assert len(scopes) == len(set(scopes))
+
+
+class TestReadOnlyScopes:
+    """Tests for read-only mode scope generation."""
+
+    def setup_method(self):
+        set_read_only(False)
+
+    def teardown_method(self):
+        set_read_only(False)
+
+    def test_docs_readonly_includes_drive_readonly(self):
+        """Even in read-only mode, docs needs drive.readonly for search/list."""
+        set_read_only(True)
+        scopes = get_scopes_for_tools(["docs"])
+        assert DRIVE_READONLY_SCOPE in scopes
+
+    def test_docs_readonly_excludes_drive_file(self):
+        """In read-only mode, docs should NOT request drive.file."""
+        set_read_only(True)
+        scopes = get_scopes_for_tools(["docs"])
+        assert DRIVE_FILE_SCOPE not in scopes
+
+    def test_sheets_readonly_includes_drive_readonly(self):
+        """Even in read-only mode, sheets needs drive.readonly for list."""
+        set_read_only(True)
+        scopes = get_scopes_for_tools(["sheets"])
+        assert DRIVE_READONLY_SCOPE in scopes