Nylas MCP by usefulapi

by usefulapi.io · remote · no sign-in to list tools · v1.16.3 · published by io.usefulapi

MCP server for Nylas — read email, calendars, events and contacts, and send email or create events.

Deletes · 3

Compare Registry entry

15 tools: 3 can delete or cancel things and 12 only read.

Scanned Oct 21, 2026

Deletes or cancels3Claude Code: deny: see these tools
Can't be undone0Claude Code: ask
Changes things0Claude Code: ask
Only reads12Claude Code: allow: see these tools

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http nylas https://nylas.usefulapi.io/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

15 tools

Deletes or cancels 3Removes, cancels or revokes something.Claude Code: deny

nylas_create_draftCreates a draft email (does NOT send — safe/additive).No findings
Why it is in this group
- The name "nylas_create_draft" says "create": a word for a change.
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it destructive (destructiveHint: true).
Description, as the server wrote it
Creates a draft email (does NOT send — safe/additive). Nylas v3: POST /v3/grants/{grant_id}/drafts.
Annotations the server declares
- title: Create a draft email
- destructiveHint: true
nylas_create_eventCreates a calendar event (may send invites to participants).No findings
Why it is in this group
- The name "nylas_create_event" says "create": a word for a change.
- The server marks it destructive (destructiveHint: true).
Description, as the server wrote it
Creates a calendar event (may send invites to participants). Requires calendar_id (sent as a query param). Nylas v3: POST /v3/grants/{grant_id}/events.
Annotations the server declares
- title: Create a calendar event
- destructiveHint: true
nylas_send_messageSENDS a real email via the connected account.No findings
Why it is in this group
- The name "nylas_send_message" says "send": a word for sending, and what is sent cannot be taken back.
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it destructive (destructiveHint: true).
Description, as the server wrote it
SENDS a real email via the connected account. This dispatches an actual message. Nylas v3: POST /v3/grants/{grant_id}/messages/send.
Annotations the server declares
- title: Send an email
- destructiveHint: true

Only reads 12Looks things up and changes nothing.Claude Code: allow

nylas_get_calendarGet a single calendar by id.No findings
Why it is in this group
- The name "nylas_get_calendar" says "get": a word for reading.
Description, as the server wrote it
Get a single calendar by id. Nylas v3: GET /v3/grants/{grant_id}/calendars/{calendar_id}.
Annotations the server declares
- title: Get a calendar
- readOnlyHint: true
nylas_get_contactGet a single contact by id.No findings
Why it is in this group
- The name "nylas_get_contact" says "get": a word for reading.
Description, as the server wrote it
Get a single contact by id. Nylas v3: GET /v3/grants/{grant_id}/contacts/{contact_id}.
Annotations the server declares
- title: Get a contact
- readOnlyHint: true
nylas_get_eventGet a single calendar event by id.No findings
Why it is in this group
- The name "nylas_get_event" says "get": a word for reading.
Description, as the server wrote it
Get a single calendar event by id. Requires calendar_id (sent as a query param). Nylas v3: GET /v3/grants/{grant_id}/events/{event_id}.
Annotations the server declares
- title: Get an event
- readOnlyHint: true
nylas_get_grantGet details for a single connected account (grant).No findings
Why it is in this group
- The name "nylas_get_grant" says "get": a word for reading.
Description, as the server wrote it
Get details for a single connected account (grant). Nylas v3: GET /v3/grants/{grant_id}.
Annotations the server declares
- title: Get a grant
- readOnlyHint: true
nylas_get_messageGet a single email message by id.No findings
Why it is in this group
- The name "nylas_get_message" says "get": a word for reading.
Description, as the server wrote it
Get a single email message by id. Nylas v3: GET /v3/grants/{grant_id}/messages/{message_id}.
Annotations the server declares
- title: Get a message
- readOnlyHint: true
nylas_list_calendarsList calendars for the connected account (each has a calendar_id used by the events tools).No findings
Why it is in this group
- The name "nylas_list_calendars" says "list": a word for reading.
Description, as the server wrote it
List calendars for the connected account (each has a calendar_id used by the events tools). Nylas v3: GET /v3/grants/{grant_id}/calendars.
Annotations the server declares
- title: List calendars
- readOnlyHint: true
nylas_list_contactsList contacts for the connected account, with optional email/phone filters.No findings
Why it is in this group
- The name "nylas_list_contacts" says "list": a word for reading.
Description, as the server wrote it
List contacts for the connected account, with optional email/phone filters. Nylas v3: GET /v3/grants/{grant_id}/contacts.
Annotations the server declares
- title: List contacts
- readOnlyHint: true
nylas_list_draftsList draft emails for the connected account.No findings
Why it is in this group
- The name "nylas_list_drafts" says "list": a word for reading.
Description, as the server wrote it
List draft emails for the connected account. Nylas v3: GET /v3/grants/{grant_id}/drafts.
Annotations the server declares
- title: List drafts
- readOnlyHint: true
nylas_list_eventsList calendar events.No findings
Why it is in this group
- The name "nylas_list_events" says "list": a word for reading.
Description, as the server wrote it
List calendar events. Requires calendar_id (sent as a query param). Nylas v3: GET /v3/grants/{grant_id}/events.
Annotations the server declares
- title: List events
- readOnlyHint: true
nylas_list_foldersList mail folders/labels for the connected account.No findings
Why it is in this group
- The name "nylas_list_folders" says "list": a word for reading.
Description, as the server wrote it
List mail folders/labels for the connected account. Nylas v3: GET /v3/grants/{grant_id}/folders.
Annotations the server declares
- title: List folders
- readOnlyHint: true
nylas_list_grantsList the connected accounts (grants) on this Nylas application, each with a grant_id used to scope other tools.No findings
Why it is in this group
- The name "nylas_list_grants" says "list": a word for reading.
Description, as the server wrote it
List the connected accounts (grants) on this Nylas application, each with a grant_id used to scope other tools. Not grant-scoped. Nylas v3: GET /v3/grants.
Annotations the server declares
- title: List grants (connected accounts)
- readOnlyHint: true
nylas_list_messagesList email messages for the connected account, with optional filters.No findings
Why it is in this group
- The name "nylas_list_messages" says "list": a word for reading.
Description, as the server wrote it
List email messages for the connected account, with optional filters. Nylas v3: GET /v3/grants/{grant_id}/messages.
Annotations the server declares
- title: List messages
- readOnlyHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.16.3. Values in angle brackets are yours to fill in.

claude mcp add --transport http nylas https://nylas.usefulapi.io/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__nylas__nylas_list_grants",
      "mcp__nylas__nylas_get_grant",
      "mcp__nylas__nylas_list_messages",
      "mcp__nylas__nylas_get_message",
      "mcp__nylas__nylas_list_folders",
      "mcp__nylas__nylas_list_calendars",
      "mcp__nylas__nylas_get_calendar",
      "mcp__nylas__nylas_list_events",
      "mcp__nylas__nylas_get_event",
      "mcp__nylas__nylas_list_contacts",
      "mcp__nylas__nylas_get_contact",
      "mcp__nylas__nylas_list_drafts"
    ],
    "ask": [],
    "deny": [
      "mcp__nylas__nylas_send_message",
      "mcp__nylas__nylas_create_event",
      "mcp__nylas__nylas_create_draft"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as nylas. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.usefulapi/nylas/changes.xml

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Anlyon alternative

3 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Source: MCP Registry · repository. Synced Oct 21, 2026, 19:23 UTC.

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