Missive for AI agents

Missive is a collaborative email and chat app that lets teams share inboxes, assign conversations, and manage tasks together in one interface. 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 Missive See the 40 actions ↓

EmailAPI keyMCP + RESTmissiveapp.com

AUDIT LOG · MISSIVEPOLICY: acme-support

09:41:07 · claude · u_8f2read

missive.list_tasks

List Missive Tasks✓ allowed · 212ms

09:41:08 · claude · u_8f2read

missive.get_task

Get Missive Task✓ allowed · 164ms

09:41:09 · claude · u_8f2write

missive.create_post

Create Missive Post✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

missive.delete_post

Delete Post✕ blocked · policy: deny

EVERY MISSIVE CALL, ON THE RECORD

01 · USE CASES

What agents do in Missive.

Look up a conversation

Pull a conversation's messages and comments to catch up before replying, read-only.

Create a draft reply

Create a draft response to a customer conversation for a teammate to review.

Approve before deleting a draft

Require approval before deleting a draft, since a colleague may still be working on it.

02 · ACTIONS

40 Missive actions, graded by risk.

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

read

Look things up. Allowed by default.

missive.get_task
Get Missive Task
missive.list_tasks
List Missive Tasks
missive.list_teams
List Missive Teams
missive.list_users
List Missive Users
missive.get_contact
Get Missive Contact
missive.get_message
Get Missive Message
missive.get_response
Get Missive Response
missive.list_contacts
List Missive Contacts
missive.list_messages
List Messages by Message-ID
missive.list_responses
List Missive Saved Responses
missive.get_conversation
Get Missive Conversation
missive.list_contact_books
List Missive Contact Books
missive.list_conversations
List Missive Conversations
missive.list_organizations
List Missive Organizations
missive.list_shared_labels
List Missive Shared Labels
missive.list_contact_groups
List Missive Contact Groups

+ 5 MORE

write

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

missive.create_post
Create Missive Post
missive.create_task
Create Missive Task
missive.create_team
Create Team
missive.update_task
Update Missive Task
missive.update_team
Update Missive Team
missive.create_draft
Create Draft
missive.create_webhook
Create Webhook
missive.update_contact
Update Missive Contact
missive.create_contacts
Create Missive Contacts
missive.create_response
Create Canned Response
missive.update_response
Update Saved Response
missive.create_shared_label
Create Shared Label
missive.update_shared_labels
Update Shared Labels
missive.create_analytics_report
Create Analytics Report

destructive

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

missive.delete_post
Delete Post
missive.delete_draft
Delete Draft
missive.delete_webhook
Delete Webhook
missive.delete_responses
Delete Saved Responses
missive.merge_conversations
Merge Missive Conversations

03 · HOW IT WORKS

Missive in three steps.

01Your users connect MissiveThey add their Missive api key on Arc0 Connect, under your brand. It goes straight into the vault.
02You set the rulesReads run, writes like “create Missive Post” can wait for the user, and “delete Post” can be denied outright.
03Any agent can actYour agent calls Missive 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('missive', {
  read: 'allow',
  write: 'ask',        // create_post
  destructive: 'deny',  // delete_post
})

# 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 Missive connects.

Users add their Missive 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 Missive 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 Missive from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More email apps.

Elastic Email91 actions

Resend66 actions Lettr60 actions

Postmark46 actions

ALL EMAIL APPS →

07 · FAQ

Missive and Arc0, answered.

Q01

Can I use Missive with Claude, ChatGPT or Cursor?

Yes. Connect Missive 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 Missive actions you allow.

Q02

How do users connect Missive?

Users add their Missive 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 Missive actions can my agent take?

40 in total: 21 read, 14 write and 5 destructive, such as “create Missive Post”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Missive?

Yes. Actions like “delete Post” 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 Missive too?

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

Get started

Plug Missive into your agent.

Your users connect Missive once, under your brand. Your agent gets 40 actions behind your policies, with every call on the record.

Connect Missive Browse all apps →

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