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Nylas for AI agents

Nylas is an infrastructure API that gives applications typed access to a connected user's email, calendar, contacts, and meeting notes. Product teams use it to power scheduling and inbox features. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect NylasSee the 38 actions ↓
CommunicationAPI keyMCP + RESTnylas.com
AUDIT LOG · NYLASPOLICY: acme-support
09:41:07 · claude · u_8f2read
nylas.list_events
List events✓ allowed · 212ms
09:41:08 · claude · u_8f2read
nylas.get_event
Get event✓ allowed · 164ms
09:41:09 · claude · u_8f2write
nylas.create_draft
Create draft✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
nylas.delete_draft
Delete draft✕ blocked · policy: deny
EVERY NYLAS CALL, ON THE RECORD
01 · USE CASES

What agents do in Nylas.

01

Check availability before scheduling

Look up a person's free and busy times across calendars before proposing a meeting slot.

02

Create a calendar event

Add a new event with attendees and a time slot directly to a connected calendar.

03

Confirm a draft before sending

Require a sign-off step to confirm and send an email draft rather than sending it outright.

02 · ACTIONS

38 Nylas actions, graded by risk.

Every Nylas action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

20

Look things up. Allowed by default.

  • nylas.get_event
    Get event
  • nylas.get_grant
    Get grant
  • nylas.get_contact
    Get contact
  • nylas.get_message
    Get message
  • nylas.list_events
    List events
  • nylas.list_folders
    List folders
  • nylas.list_threads
    List threads
  • nylas.get_notetaker
    Get notetaker
  • nylas.list_contacts
    List contacts
  • nylas.list_messages
    List messages
  • nylas.list_calendars
    List calendars
  • nylas.list_notetakers
    List notetakers
  • nylas.get_folder_by_id
    Get folder by
  • nylas.get_search_syntax
    Get search syntax
  • nylas.get_notetaker_media
    Get notetaker media
  • nylas.get_notetaker_transcript
    Get notetaker transcript
+ 4 MORE

write

16

Create and change things. Allow, or ask the user first.

  • nylas.send_draft
    Send draft
  • nylas.create_draft
    Create draft
  • nylas.create_event
    Create event
  • nylas.send_message
    Send message
  • nylas.update_draft
    Update draft
  • nylas.update_event
    Update event
  • nylas.send_notetaker
    Send notetaker
  • nylas.send_standalone_notetaker
    Send standalone notetaker
  • nylas.availability
    Availability
  • nylas.current_time
    Current time
  • nylas.datetime_to_epoch
    Datetime to epoch
  • nylas.epoch_to_datetime
    Epoch to datetime
  • nylas.confirm_send_draft
    Confirm send draft
  • nylas.schedule_notetaker
    Schedule notetaker
  • nylas.confirm_send_message
    Confirm send message
  • nylas.schedule_standalone_notetaker
    Schedule standalone notetaker

destructive

2

Delete, cancel or archive. Ask first, or deny outright.

  • nylas.delete_draft
    Delete draft
  • nylas.delete_event
    Delete event
03 · HOW IT WORKS

Nylas in three steps.

  1. 01Your users connect NylasThey add their Nylas api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “create draft” can wait for the user, and “delete draft” can be denied outright.
  3. 03Any agent can actYour agent calls Nylas through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('nylas', {
  read: 'allow',
  write: 'ask',        // create_draft
  destructive: 'deny',  // delete_draft
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Nylas connects.

Users add their Nylas api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Nylas connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Nylas from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More communication apps.

Slack168 actionsMicrosoft Teams174 actionsDiscord28 actionsSlackbot101 actions2chat5 actionsAimTell15 actionsAndroid Texter11 actionsDialpad192 actions
ALL COMMUNICATION APPS →
07 · FAQ

Nylas and Arc0, answered.

Q01

Can I use Nylas with Claude, ChatGPT or Cursor?

Yes. Connect Nylas to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Nylas actions you allow.

Q02

How do users connect Nylas?

Users add their Nylas api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Nylas actions can my agent take?

38 in total: 20 read, 16 write and 2 destructive, such as “create draft”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Nylas?

Yes. Actions like “delete draft” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Nylas too?

Yes. The same Nylas connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Nylas into your agent.

Your users connect Nylas once, under your brand. Your agent gets 38 actions behind your policies, with every call on the record.

Connect NylasBrowse all apps →

Free to build · MCP + REST · Audit log on every plan