feat(msteams): add list_joined_teams tool and tests

[NolanJMcCafferty]

Description

Add a new tool for the MS Teams MCP Server to list the Teams that the user has joined. This is different from listing all the teams, especially because list_joined_teams does not require Admin consent, it just requires regular OAuth.

Related issue

Type of change

• New MCP feature (non-breaking change which adds functionality)

How has this been tested?

uv run --with pytest --with pytest-asyncio --with msal --with httpx --with python-dotenv pytest tests/test_tools.py -v
============================================================================== test session starts ==============================================================================
platform linux -- Python 3.12.3, pytest-9.0.2, pluggy-1.6.0 -- /home/nolan-mccafferty/.cache/uv/builds-v0/.tmpWZDIzB/bin/python
cachedir: .pytest_cache
rootdir: /home/nolan-mccafferty/workspace/klavis/mcp_servers/msteams
plugins: asyncio-1.3.0, anyio-4.12.1
asyncio: mode=Mode.STRICT, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
collected 14 items                                                                                                                                                              

tests/test_tools.py::TestTeamsTools::test_list_all_teams PASSED                                                                                                           [  7%]
tests/test_tools.py::TestTeamsTools::test_get_team PASSED                                                                                                                 [ 14%]
tests/test_tools.py::TestTeamsTools::test_list_channels PASSED                                                                                                            [ 21%]
tests/test_tools.py::TestTeamsTools::test_create_channel PASSED                                                                                                           [ 28%]
tests/test_tools.py::TestTeamsTools::test_create_channel_without_description PASSED                                                                                       [ 35%]
tests/test_tools.py::TestTeamsTools::test_send_channel_message PASSED                                                                                                     [ 42%]
tests/test_tools.py::TestTeamsTools::test_list_joined_teams PASSED                                                                                                        [ 50%]
tests/test_tools.py::TestChatsTools::test_list_chats PASSED                                                                                                               [ 57%]
tests/test_tools.py::TestChatsTools::test_send_chat_message PASSED                                                                                                        [ 64%]
tests/test_tools.py::TestUsersTools::test_list_users PASSED                                                                                                               [ 71%]
tests/test_tools.py::TestUsersTools::test_get_user PASSED                                                                                                                 [ 78%]
tests/test_tools.py::TestUsersTools::test_get_user_by_principal_name PASSED                                                                                               [ 85%]
tests/test_tools.py::TestMeetingsTools::test_create_online_meeting PASSED                                                                                                 [ 92%]
tests/test_tools.py::TestMeetingsTools::test_list_online_meetings PASSED                                                                                                  [100%]

============================================================================== 14 passed in 0.10s ===============================================================================


and from my client...

nexhelm-klavis-msteams-mcp        | INFO:     172.19.0.12:34032 - "POST /mcp/ HTTP/1.1" 200 OK
nexhelm-klavis-msteams-mcp        | 2026-01-13 22:45:58,716 - mcp.server.lowlevel.server - INFO - Processing request of type CallToolRequest
nexhelm-klavis-msteams-mcp        | 2026-01-13 22:46:00,641 - httpx - INFO - HTTP Request: GET https://graph.microsoft.com/v1.0//me/joinedTeams "HTTP/1.1 200 OK"
nexhelm-klavis-msteams-mcp        | 2026-01-13 22:46:00,644 - mcp.server.streamable_http - INFO - Terminating session: None
nexhelm-fastapi                   | 2026-01-13 22:46:00 - app.services.langchain_agent.db_operations - INFO - Recorded tool call: Msteams List Joined Teams (msteams_list_joined_teams) for execution 3392cd67-7bac-4066-9aa7-1a341063c1be
nexhelm-fastapi                   | 2026-01-13 22:46:00 - app.services.langchain_agent.agent_executor - INFO - type=<StreamEventType.TOOL_END: 'tool_end'> data={'tool_name': 'msteams_list_joined_teams', 'output': {'tool_call_id': 'toolu_0182b5kpyckVY24NPuNVsWKn', 'content': '{...}'}, 'thinking_message': 'Analyzing results...'} timestamp=datetime.datetime(2026, 1, 13, 22, 46, 0, 728346, tzinfo=datetime.timezone.utc)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes