# Microsoft 365 Calendar (npm · @mindstone/mcp-server-microsoft-calendar)

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

- Trust score: 77/100 (medium)
- Change this week: +31
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-04

## Components

- npm · `@mindstone/mcp-server-microsoft-calendar`: 77/100 (this document), [markdown](https://verifymcp.io/servers/mindstone-mcp-server-microsoft-calendar/mindstone-mcp-server-microsoft-calendar.md), [page](https://verifymcp.io/servers/mindstone-mcp-server-microsoft-calendar/mindstone-mcp-server-microsoft-calendar)

## Channel facts

- Registry: `npm`
- Package: `@mindstone/mcp-server-microsoft-calendar`
- Version: `0.1.2`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-04.

- **Supply Chain Security**: 87/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (105 of 109), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (105 of 109), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 84/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to mindstone/mcp-servers).
  - License check failed: the license (FSL-1.1-MIT) isn't a recognized OSI-approved license.
  - Actively maintained (last published 31 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 714 tokens (~89/item across 8 items; 8 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add mindstone-mcp-server-microsoft-calendar -- npx -y @mindstone/mcp-server-microsoft-calendar
```

### Codex

```bash
codex mcp add mindstone-mcp-server-microsoft-calendar -- npx -y @mindstone/mcp-server-microsoft-calendar
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "mindstone-mcp-server-microsoft-calendar": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@mindstone/mcp-server-microsoft-calendar"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add mindstone-mcp-server-microsoft-calendar --command npx --arg -y --arg @mindstone/mcp-server-microsoft-calendar
```

### Hermes

```yaml
mcp_servers:
  mindstone-mcp-server-microsoft-calendar:
    command: "npx"
    args: ["-y", "@mindstone/mcp-server-microsoft-calendar"]
```

### Other

```json
{
  "mcpServers": {
    "mindstone-mcp-server-microsoft-calendar": {
      "command": "npx",
      "args": [
        "-y",
        "@mindstone/mcp-server-microsoft-calendar"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-02 (score 76, +55)

- [security improvement] Install scripts: unverified → pass
- [security improvement] Provenance: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Malware scan: unverified → pass
- [security] The attested source repository moved: mindstone/mcp-servers
- [functional regression] License: unverified → fail
- [functional improvement] Schema quality: unverified → excellent
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] Stability: unverified → 0.20
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] MCP protocol: unverified → pass
- [functional] Licence: FSL-1.1-MIT

### 2026-08-01 (score 21, +1)

- [security regression] Malware scan: pass → unverified
- [functional improvement] Tool coverage: unverified → 100

### 2026-07-31 (score 20, −26)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-27 (score 46)

First indexed and scored.

## MCP tools (8)

### `list_events` (~190 tokens)

List calendar events within a date range. Returns JSON by default (with timezoneInfo showing calendar, device, and resolved timezone). Set returnText=true for a human-readable agenda format. Pass deviceTimezone from the system prompt for fallback if calendar settings are unavailable.

Input parameters:

- `calendarId` (string): Calendar ID (default: primary calendar)
- `deviceTimezone` (string): User's device IANA timezone from system prompt (e.g. "Europe/London"). Used as fallback if calendar settings unavailable, and for mismatch detection.
- `endDateTime` (string): End date/time in ISO format (default: 7 days from now)
- `returnText` (boolean): Return human-readable agenda text instead of JSON (default: false)
- `startDateTime` (string): Start date/time in ISO format (default: now)
- `top` (number): Max events to return (default: 50)

### `get_event` (~26 tokens)

Get detailed information about a specific calendar event.

Input parameters:

- `id` (string): Event ID

### `create_event` (~171 tokens)

Create a new calendar event.

Input parameters:

- `attendees` (array): Attendee email addresses
- `body` (string): Event description (HTML supported)
- `deviceTimezone` (string): User's device IANA timezone from system prompt (e.g. "Europe/London"). Used to interpret start/end times if calendar settings unavailable.
- `end` (string): End date/time in ISO format
- `isAllDay` (boolean): All-day event (default: false)
- `isOnlineMeeting` (boolean): Create Teams meeting link (default: false)
- `location` (string): Event location
- `showAs` (string): How this event should appear in availability (free/busy) views
- `start` (string): Start date/time in ISO format
- `subject` (string): Event title

### `update_event` (~108 tokens)

Update an existing calendar event.

Input parameters:

- `body` (string): New description
- `deviceTimezone` (string): User's device IANA timezone from system prompt (e.g. "Europe/London"). Used to interpret start/end times if calendar settings unavailable.
- `end` (string): New end date/time
- `id` (string): Event ID
- `location` (string): New location
- `start` (string): New start date/time
- `subject` (string): New title

### `delete_event` (~39 tokens)

Delete a calendar event.

Input parameters:

- `id` (string): Event ID
- `notifyAttendees` (boolean): Send cancellation to attendees (default: true)

### `respond_to_event` (~65 tokens)

Accept, decline, or tentatively accept an event invitation.

Input parameters:

- `comment` (string): Optional response message
- `id` (string): Event ID
- `response` (string): Your response
- `sendResponse` (boolean): Send response to organizer (default: true)

### `get_free_busy` (~96 tokens)

Check availability/free-busy status for users.

Input parameters:

- `deviceTimezone` (string): User's device IANA timezone from system prompt (e.g. "Europe/London"). Used to interpret time range if calendar settings unavailable.
- `emails` (array): Email addresses to check
- `endDateTime` (string): End of time range (ISO format)
- `startDateTime` (string): Start of time range (ISO format)

### `list_calendars` (~19 tokens)

List all calendars the user has access to.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/mindstone-mcp-server-microsoft-calendar/mindstone-mcp-server-microsoft-calendar#diagnostics

## Score history

- 2026-08-04: 77
- 2026-08-03: 77
- 2026-08-02: 76
- 2026-08-01: 21
- 2026-07-31: 20
- 2026-07-30: 46
- 2026-07-28: 46
- 2026-07-27: 46

## Links

- npm package: https://www.npmjs.com/package/@mindstone/mcp-server-microsoft-calendar
- Socket report: https://socket.dev/npm/package/@mindstone/mcp-server-microsoft-calendar
- Repository: https://github.com/mindstone/mcp-servers
- Changelog RSS feed: https://verifymcp.io/servers/mindstone-mcp-server-microsoft-calendar/mindstone-mcp-server-microsoft-calendar/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/mindstone-mcp-server-microsoft-calendar/mindstone-mcp-server-microsoft-calendar/changelog.json
- HTML version of this page: https://verifymcp.io/servers/mindstone-mcp-server-microsoft-calendar/mindstone-mcp-server-microsoft-calendar