io.github.mindstone/mcp-server-microsoft-calendar

Microsoft 365 Calendar

Is the Microsoft 365 Calendar MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-27.

Microsoft 365 Outlook calendar via Graph: list, get, create, update, respond, free/busy.

alive probed 2026-11-14 · unchanged since 2026-10-27

10tools

5.0ktokens in Claude Opus 5.5

2.5 %of Claude's 200k window

2.0×the median server

285 msto initialize

8 msto list tools

Run it: npx -y @mindstone/mcp-server-microsoft-calendar@0.2.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: mcp-server-microsoft-calendar 0.2.0
Capabilities: tools
Instructions: none
Of a 1M window: 0.5 % of a 1M context window
Count: 5.0k tokens in Claude Opus 5.5, exact, measured 2026-10-27. With the Claude Code prefix mcp__…__ on each tool name: 5.1k. The o200k_base estimate is 2.8k. Counted again when the tool definitions change. Method.
Repository: https://github.com/mindstone/mcp-servers
Registry: active, updated 2026-08-07 · registry entry
Changes: 2 recorded, reachable in 2 of them. A row is added when the result, the tool count or the cost changes.

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.78×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
create_event	1 283	721	26 %
update_event	1 125	632	23 %
find_meeting_times	724	407	15 %
list_events	616	346	12 %
get_free_busy	397	223	8 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Google Workspace io.github.mindstone/mcp-server-google-workspace · needs env
HubSpot io.github.mindstone/mcp-server-hubspot · needs env
Humaans io.github.mindstone/mcp-server-humaans · alive
Kling io.github.mindstone/mcp-server-kling · alive
Microsoft 365 Files io.github.mindstone/mcp-server-microsoft-files · alive
Microsoft 365 Mail io.github.mindstone/mcp-server-microsoft-mail · alive
Microsoft 365 SharePoint io.github.mindstone/mcp-server-microsoft-sharepoint · alive
Microsoft 365 Teams io.github.mindstone/mcp-server-microsoft-teams · alive

Servers that mention microsoft.

adplane ai.adplane/google-ads · needs auth
Chronary ai.chronary/mcp · alive
PDS Project AI MPP Connector ai.projectdata/mpp-connector · needs auth
ai.smithery/DynamicEndpoints-m365-core-mcp · not found
ai.waystation/teams · paid (402)
Multi Mail co.lumman/mail · needs auth
agntpad com.agntpad/agntpad · needs auth
Microsoft Windows Security Updates (MSRC CVRF) — buy per-query in-session (msrcwatch) com.a2awire/data-windows-security-update-microsoft-cvrf · alive

We add a row when the result changes. A server with no change keeps its last row.

Probed	Result	Init	Tools	Claude	o200k
2026-10-27 06:56	alive	375 ms	10	5.0k	2.8k
2026-10-20 06:43	alive	285 ms	10		2.8k

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.