diff --git a/toolkits/google/arcade_google/tools/calendar.py b/toolkits/google/arcade_google/tools/calendar.py
index a5456996..ee0bd293 100644
--- a/toolkits/google/arcade_google/tools/calendar.py
+++ b/toolkits/google/arcade_google/tools/calendar.py
@@ -6,17 +6,64 @@ from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 from arcade.sdk import ToolContext, tool
 from arcade.sdk.auth import Google
 from arcade.sdk.errors import RetryableToolError
-from google.oauth2.credentials import Credentials
-from googleapiclient.discovery import build
 from googleapiclient.errors import HttpError
 
 from arcade_google.models import EventVisibility, SendUpdatesOptions
 from arcade_google.utils import (
+    build_calendar_service,
+    build_oauth_service,
     compute_free_time_intersection,
     parse_datetime,
 )
 
 
+@tool(
+    requires_auth=Google(
+        scopes=[
+            "https://www.googleapis.com/auth/calendar.readonly",
+            "https://www.googleapis.com/auth/calendar.events",
+        ]
+    )
+)
+async def list_calendars(
+    context: ToolContext,
+    max_results: Annotated[
+        int, "The maximum number of calendars to return. " "Up to 250 calendars, defaults to 10."
+    ] = 10,
+    show_deleted: Annotated[
+        bool, "Whether to show deleted calendars." " Defaults to False"
+    ] = False,
+    show_hidden: Annotated[bool, "Whether to show hidden calendars." " Defaults to False"] = False,
+    next_page_token: Annotated[
+        str | None, "The token to retrieve the next page of calendars. Optional."
+    ] = None,
+) -> Annotated[dict, "A dictionary containing the calendars accessible by the end user"]:
+    """
+    List all calendars accessible by the user.
+    """
+    max_results = max(1, min(max_results, 250))
+    service = build_calendar_service(context.get_auth_token_or_empty())
+    calendars = (
+        service.calendarList()
+        .list(
+            pageToken=next_page_token,
+            showDeleted=show_deleted,
+            showHidden=show_hidden,
+            maxResults=max_results,
+        )
+        .execute()
+    )
+
+    items = calendars.get("items", [])
+    keys = ["description", "id", "summary", "timeZone"]
+    relevant_items = [{k: i.get(k) for k in keys if i.get(k)} for i in items]
+    return {
+        "next_page_token": calendars.get("nextPageToken"),
+        "num_calendars": len(relevant_items),
+        "calendars": relevant_items,
+    }
+
+
 @tool(
     requires_auth=Google(
         scopes=[
@@ -49,15 +96,7 @@ async def create_event(
 ) -> Annotated[dict, "A dictionary containing the created event details"]:
     """Create a new event/meeting/sync/meetup in the specified calendar."""
 
-    service = build(
-        "calendar",
-        "v3",
-        credentials=Credentials(
-            context.authorization.token
-            if context.authorization and context.authorization.token
-            else ""
-        ),
-    )
+    service = build_calendar_service(context.get_auth_token_or_empty())
 
     # Get the calendar's time zone
     calendar = service.calendars().get(calendarId=calendar_id).execute()
@@ -121,15 +160,7 @@ async def list_events(
     ending at 10:00 on September 15 would be included, but an
     event starting at 17:00 on September 16 would not be included.
     """
-    service = build(
-        "calendar",
-        "v3",
-        credentials=Credentials(
-            context.authorization.token
-            if context.authorization and context.authorization.token
-            else ""
-        ),
-    )
+    service = build_calendar_service(context.get_auth_token_or_empty())
 
     # Get the calendar's time zone
     calendar = service.calendars().get(calendarId=calendar_id).execute()
@@ -229,15 +260,7 @@ async def update_event(
     `updated_start_datetime` and `updated_end_datetime` are
     independent and can be provided separately.
     """
-    service = build(
-        "calendar",
-        "v3",
-        credentials=Credentials(
-            context.authorization.token
-            if context.authorization and context.authorization.token
-            else ""
-        ),
-    )
+    service = build_calendar_service(context.get_auth_token_or_empty())
 
     calendar = service.calendars().get(calendarId="primary").execute()
     time_zone = calendar["timeZone"]
@@ -335,15 +358,7 @@ async def delete_event(
     ] = SendUpdatesOptions.ALL,
 ) -> Annotated[str, "A string containing the deletion confirmation message"]:
     """Delete an event from Google Calendar."""
-    service = build(
-        "calendar",
-        "v3",
-        credentials=Credentials(
-            context.authorization.token
-            if context.authorization and context.authorization.token
-            else ""
-        ),
-    )
+    service = build_calendar_service(context.get_auth_token_or_empty())
 
     service.events().delete(
         calendarId=calendar_id, eventId=event_id, sendUpdates=send_updates.value
@@ -405,13 +420,10 @@ async def find_time_slots_when_everyone_is_free(
     """
     Provides time slots when everyone is free within a given date range and time boundaries.
     """
-    credentials = Credentials(
-        context.authorization.token if context.authorization and context.authorization.token else ""
-    )
 
     # Build google api services
-    oauth_service = build("oauth2", "v2", credentials=credentials)
-    calendar_service = build("calendar", "v3", credentials=credentials)
+    oauth_service = build_oauth_service(context.get_auth_token_or_empty())
+    calendar_service = build_calendar_service(context.get_auth_token_or_empty())
 
     email_addresses = email_addresses or []
 
diff --git a/toolkits/google/arcade_google/tools/contacts.py b/toolkits/google/arcade_google/tools/contacts.py
index 6ac6134e..96003cf5 100644
--- a/toolkits/google/arcade_google/tools/contacts.py
+++ b/toolkits/google/arcade_google/tools/contacts.py
@@ -3,8 +3,6 @@ from typing import Annotated
 
 from arcade.sdk import ToolContext, tool
 from arcade.sdk.auth import Google
-from google.oauth2.credentials import Credentials
-from googleapiclient.discovery import build
 
 from arcade_google.constants import DEFAULT_SEARCH_CONTACTS_LIMIT
 from arcade_google.utils import build_people_service, search_contacts
@@ -32,9 +30,7 @@ async def search_contacts_by_email(
     """
     Search the user's contacts in Google Contacts by email address.
     """
-    service = build_people_service(
-        context.authorization.token if context.authorization and context.authorization.token else ""
-    )
+    service = build_people_service(context.get_auth_token_or_empty())
     # Warm-up the cache before performing search.
     # TODO: Ideally we should warmup only if this user (or google domain?) hasn't warmed up recently
     await _warmup_cache(service)
@@ -54,9 +50,7 @@ async def search_contacts_by_name(
     """
     Search the user's contacts in Google Contacts by name.
     """
-    service = build_people_service(
-        context.authorization.token if context.authorization and context.authorization.token else ""
-    )
+    service = build_people_service(context.get_auth_token_or_empty())
     # Warm-up the cache before performing search.
     # TODO: Ideally we should warmup only if this user (or google domain?) hasn't warmed up recently
     await _warmup_cache(service)
@@ -81,15 +75,7 @@ async def create_contact(
     ```
     """
     # Build the People API service
-    service = build(
-        "people",
-        "v1",
-        credentials=Credentials(
-            context.authorization.token
-            if context.authorization and context.authorization.token
-            else ""
-        ),
-    )
+    service = build_people_service(context.get_auth_token_or_empty())
 
     # Construct the person payload with the specified names
     name_body = {"givenName": given_name}
diff --git a/toolkits/google/arcade_google/utils.py b/toolkits/google/arcade_google/utils.py
index 8c0bd55a..06a3f098 100644
--- a/toolkits/google/arcade_google/utils.py
+++ b/toolkits/google/arcade_google/utils.py
@@ -828,6 +828,24 @@ def merge_intervals(intervals: list[tuple[datetime, datetime]]) -> list[tuple[da
 
 
 # Calendar utils
+
+
+def build_oauth_service(auth_token: str | None) -> Resource:  # type: ignore[no-any-unimported]
+    """
+    Build an OAuth2 service object.
+    """
+    auth_token = auth_token or ""
+    return build("oauth2", "v2", credentials=Credentials(auth_token))
+
+
+def build_calendar_service(auth_token: str | None) -> Resource:  # type: ignore[no-any-unimported]
+    """
+    Build a Calendar service object.
+    """
+    auth_token = auth_token or ""
+    return build("calendar", "v3", credentials=Credentials(auth_token))
+
+
 def weekday_to_name(weekday: int) -> str:
     return ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"][weekday]
 
diff --git a/toolkits/google/evals/eval_google_calendar.py b/toolkits/google/evals/eval_google_calendar.py
index 669c24e9..f06d610b 100644
--- a/toolkits/google/evals/eval_google_calendar.py
+++ b/toolkits/google/evals/eval_google_calendar.py
@@ -15,6 +15,7 @@ from arcade_google.models import EventVisibility, SendUpdatesOptions
 from arcade_google.tools.calendar import (
     create_event,
     delete_event,
+    list_calendars,
     list_events,
     update_event,
 )
@@ -73,6 +74,19 @@ def calendar_eval_suite() -> EvalSuite:
         rubric=rubric,
     )
 
+    # Cases for list_calendars
+    suite.add_case(
+        name="List Calendars",
+        user_message=("What calendars do I have?"),
+        expected_tool_calls=[
+            ExpectedToolCall(
+                func=list_calendars,
+                args={},
+            )
+        ],
+        critics=[],
+    )
+
     # Cases for create_event
     suite.add_case(
         name="Create calendar event",
@@ -139,7 +153,7 @@ def calendar_eval_suite() -> EvalSuite:
         name="Update a calendar event",
         user_message=(
             "Oh no! I can't make it to the API Test since I have lunch with an old friend at that time. "
-            "Change the meeting my meeting tomorrow at 3pm to 4pm. Let everyone know."
+            "Change my meeting tomorrow at 3pm to 4pm. Let everyone know."
         ),
         expected_tool_calls=[
             ExpectedToolCall(
diff --git a/toolkits/google/pyproject.toml b/toolkits/google/pyproject.toml
index c79e42f6..7abbdb5a 100644
--- a/toolkits/google/pyproject.toml
+++ b/toolkits/google/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "arcade_google"
-version = "1.1.1"
+version = "1.1.2"
 description = "Arcade.dev LLM tools for Google Workspace"
 authors = ["Arcade <dev@arcade.dev>"]
 
diff --git a/toolkits/google/tests/test_calendar.py b/toolkits/google/tests/test_calendar.py
index 296c3cd8..e5414350 100644
--- a/toolkits/google/tests/test_calendar.py
+++ b/toolkits/google/tests/test_calendar.py
@@ -12,6 +12,7 @@ from arcade_google.tools.calendar import (
     create_event,
     delete_event,
     find_time_slots_when_everyone_is_free,
+    list_calendars,
     list_events,
     update_event,
 )
@@ -24,7 +25,92 @@ def mock_context():
 
 
 @pytest.mark.asyncio
-@patch("arcade_google.tools.calendar.build")
+@patch("arcade_google.tools.calendar.build_calendar_service")
+async def test_list_calendars(mock_build_calendar_service, mock_context):
+    mock_service = MagicMock()
+    mock_build_calendar_service.return_value = mock_service
+
+    expected_api_response = {
+        "etag": '"p33for2n0pvc8o0o"',
+        "items": [
+            {
+                "accessRole": "reader",
+                "backgroundColor": "#16a765",
+                "colorId": "8",
+                "conferenceProperties": {"allowedConferenceSolutionTypes": ["hangoutsMeet"]},
+                "defaultReminders": [],
+                "description": "Holidays and Observances in Brazil",
+                "etag": '"2347287866334000"',
+                "foregroundColor": "#000000",
+                "id": "en.brazilian#holiday@group.v.calendar.google.com",
+                "kind": "calendar#calendarListEntry",
+                "selected": True,
+                "summary": "Holidays in Brazil",
+                "timeZone": "America/Sao_Paulo",
+            },
+            {
+                "accessRole": "owner",
+                "backgroundColor": "#9fe1e7",
+                "colorId": "14",
+                "conferenceProperties": {"allowedConferenceSolutionTypes": ["hangoutsMeet"]},
+                "defaultReminders": [{"method": "popup", "minutes": 10}],
+                "etag": '"1743169667849567"',
+                "foregroundColor": "#000000",
+                "id": "example@arcade.dev",
+                "kind": "calendar#calendarListEntry",
+                "notificationSettings": {
+                    "notifications": [
+                        {"method": "email", "type": "eventCreation"},
+                        {"method": "email", "type": "eventChange"},
+                        {"method": "email", "type": "eventCancellation"},
+                        {"method": "email", "type": "eventResponse"},
+                    ]
+                },
+                "primary": True,
+                "selected": True,
+                "summary": "example@arcade.dev",
+                "timeZone": "America/Sao_Paulo",
+            },
+        ],
+        "kind": "calendar#calendarList",
+        "nextSyncToken": "XkJ8Hy5mN2pQvL9sR4tW7cA3fE1iU6nB",
+    }
+
+    expected_tool_response = {
+        "num_calendars": 2,
+        "calendars": [
+            {
+                "description": "Holidays and Observances in Brazil",
+                "id": "en.brazilian#holiday@group.v.calendar.google.com",
+                "summary": "Holidays in Brazil",
+                "timeZone": "America/Sao_Paulo",
+            },
+            {
+                "id": "example@arcade.dev",
+                "summary": "example@arcade.dev",
+                "timeZone": "America/Sao_Paulo",
+            },
+        ],
+        "next_page_token": None,
+    }
+
+    mock_service.calendarList().list().execute.return_value = expected_api_response
+
+    response = await list_calendars(context=mock_context)
+    assert response == expected_tool_response
+
+    # Case: HttpError during calendars listing
+    mock_service.calendarList().list().execute.side_effect = HttpError(
+        resp=MagicMock(status=400),
+        content=b'{"error": {"message": "Invalid request"}}',
+    )
+
+    with pytest.raises(ToolExecutionError):
+        await list_calendars(context=mock_context)
+
+
+@pytest.mark.asyncio
+@patch("arcade_google.tools.calendar.build_calendar_service")
 async def test_create_event(mock_build, mock_context):
     mock_service = MagicMock()
     mock_build.return_value = mock_service
@@ -52,7 +138,7 @@ async def test_create_event(mock_build, mock_context):
 
 
 @pytest.mark.asyncio
-@patch("arcade_google.tools.calendar.build")
+@patch("arcade_google.tools.calendar.build_calendar_service")
 async def test_list_events(mock_build, mock_context):
     mock_service = MagicMock()
     mock_build.return_value = mock_service
@@ -117,7 +203,7 @@ async def test_list_events(mock_build, mock_context):
 
 
 @pytest.mark.asyncio
-@patch("arcade_google.tools.calendar.build")
+@patch("arcade_google.tools.calendar.build_calendar_service")
 async def test_update_event(mock_build, mock_context):
     mock_service = MagicMock()
     mock_build.return_value = mock_service
@@ -145,7 +231,7 @@ async def test_update_event(mock_build, mock_context):
 
 
 @pytest.mark.asyncio
-@patch("arcade_google.tools.calendar.build")
+@patch("arcade_google.tools.calendar.build_calendar_service")
 async def test_delete_event(mock_build, mock_context):
     mock_service = MagicMock()
     mock_build.return_value = mock_service
@@ -164,15 +250,19 @@ async def test_delete_event(mock_build, mock_context):
 
 @pytest.mark.asyncio
 @patch("arcade_google.utils.get_now")
-@patch("arcade_google.tools.calendar.build")
-async def test_find_free_slots_happiest_path_single_user(mock_build, mock_get_now, mock_context):
+@patch("arcade_google.tools.calendar.build_oauth_service")
+@patch("arcade_google.tools.calendar.build_calendar_service")
+async def test_find_free_slots_happiest_path_single_user(
+    mock_build_calendar_service, mock_build_oauth_service, mock_get_now, mock_context
+):
     calendar_service = MagicMock()
     oauth_service = MagicMock()
 
     mock_get_now.return_value = datetime(
         2025, 3, 10, 9, 25, 0, tzinfo=ZoneInfo("America/Los_Angeles")
     )
-    mock_build.side_effect = [oauth_service, calendar_service]
+    mock_build_oauth_service.return_value = oauth_service
+    mock_build_calendar_service.return_value = calendar_service
 
     oauth_service.userinfo().get().execute.return_value = {
         "email": "example@arcade.dev",
@@ -226,9 +316,10 @@ async def test_find_free_slots_happiest_path_single_user(mock_build, mock_get_no
 
 @pytest.mark.asyncio
 @patch("arcade_google.utils.get_now")
-@patch("arcade_google.tools.calendar.build")
+@patch("arcade_google.tools.calendar.build_oauth_service")
+@patch("arcade_google.tools.calendar.build_calendar_service")
 async def test_find_free_slots_happiest_path_single_user_with_busy_times(
-    mock_build, mock_get_now, mock_context
+    mock_build_calendar_service, mock_build_oauth_service, mock_get_now, mock_context
 ):
     calendar_service = MagicMock()
     oauth_service = MagicMock()
@@ -236,7 +327,9 @@ async def test_find_free_slots_happiest_path_single_user_with_busy_times(
     mock_get_now.return_value = datetime(
         2025, 3, 10, 9, 25, 0, tzinfo=ZoneInfo("America/Los_Angeles")
     )
-    mock_build.side_effect = [oauth_service, calendar_service]
+
+    mock_build_oauth_service.return_value = oauth_service
+    mock_build_calendar_service.return_value = calendar_service
 
     oauth_service.userinfo().get().execute.return_value = {
         "email": "example@arcade.dev",
@@ -321,9 +414,10 @@ async def test_find_free_slots_happiest_path_single_user_with_busy_times(
 
 @pytest.mark.asyncio
 @patch("arcade_google.utils.get_now")
-@patch("arcade_google.tools.calendar.build")
+@patch("arcade_google.tools.calendar.build_oauth_service")
+@patch("arcade_google.tools.calendar.build_calendar_service")
 async def test_find_free_slots_happiest_path_multiple_users_with_busy_times(
-    mock_build, mock_get_now, mock_context
+    mock_build_calendar_service, mock_build_oauth_service, mock_get_now, mock_context
 ):
     calendar_service = MagicMock()
     oauth_service = MagicMock()
@@ -331,7 +425,9 @@ async def test_find_free_slots_happiest_path_multiple_users_with_busy_times(
     mock_get_now.return_value = datetime(
         2025, 3, 10, 9, 25, 0, tzinfo=ZoneInfo("America/Los_Angeles")
     )
-    mock_build.side_effect = [oauth_service, calendar_service]
+
+    mock_build_oauth_service.return_value = oauth_service
+    mock_build_calendar_service.return_value = calendar_service
 
     oauth_service.userinfo().get().execute.return_value = {
         "email": "example@arcade.dev",
@@ -428,9 +524,10 @@ async def test_find_free_slots_happiest_path_multiple_users_with_busy_times(
 
 @pytest.mark.asyncio
 @patch("arcade_google.utils.get_now")
-@patch("arcade_google.tools.calendar.build")
+@patch("arcade_google.tools.calendar.build_oauth_service")
+@patch("arcade_google.tools.calendar.build_calendar_service")
 async def test_find_free_slots_with_google_calendar_error_not_found(
-    mock_build, mock_get_now, mock_context
+    mock_build_calendar_service, mock_build_oauth_service, mock_get_now, mock_context
 ):
     calendar_service = MagicMock()
     oauth_service = MagicMock()
@@ -438,7 +535,8 @@ async def test_find_free_slots_with_google_calendar_error_not_found(
     mock_get_now.return_value = datetime(
         2025, 3, 10, 9, 25, 0, tzinfo=ZoneInfo("America/Los_Angeles")
     )
-    mock_build.side_effect = [oauth_service, calendar_service]
+    mock_build_oauth_service.return_value = oauth_service
+    mock_build_calendar_service.return_value = calendar_service
 
     oauth_service.userinfo().get().execute.return_value = {
         "email": "example@arcade.dev",
diff --git a/toolkits/google/tests/test_contacts.py b/toolkits/google/tests/test_contacts.py
index 6f62433b..9ec19b32 100644
--- a/toolkits/google/tests/test_contacts.py
+++ b/toolkits/google/tests/test_contacts.py
@@ -28,7 +28,9 @@ async def test_create_contact_success(mock_context):
     service_mock = MagicMock()
     service_mock.people.return_value = people_mock
 
-    with patch("arcade_google.tools.contacts.build", return_value=service_mock) as mock_build:
+    with patch(
+        "arcade_google.tools.contacts.build_people_service", return_value=service_mock
+    ) as mock_build:
         result = await create_contact(
             mock_context,
             given_name="Alice",
@@ -63,7 +65,7 @@ async def test_create_contact_success_without_optional(mock_context):
     service_mock = MagicMock()
     service_mock.people.return_value = people_mock
 
-    with patch("arcade_google.tools.contacts.build", return_value=service_mock):
+    with patch("arcade_google.tools.contacts.build_people_service", return_value=service_mock):
         result = await create_contact(mock_context, given_name="Bob", family_name=None, email=None)
         assert "contact" in result
         assert result["contact"] == created_contact_data
@@ -88,7 +90,7 @@ async def test_create_contact_error(mock_context):
     service_mock.people.return_value = people_mock
 
     with (
-        patch("arcade_google.tools.contacts.build", return_value=service_mock),
+        patch("arcade_google.tools.contacts.build_people_service", return_value=service_mock),
         pytest.raises(Exception, match="Error in execution of CreateContact"),
     ):
         await create_contact(mock_context, given_name="Alice", family_name="Doe", email=None)