agent-mail

AgentMail through One

Agent Mail enables developers to give AI agents unique, programmable email inboxes that can send, receive, and act on emails at scale—featuring API-first integration, custom domains, and built-in deliverability safeguards.

One exposes AgentMail through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.

How to run an action

1. Find the action in the table below, or call search_one_platform_actions with platform agent-mail if it is not listed.
2. Call get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
3. Call execute_one_action with parameters copied from that knowledge.

Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.

Before you start

Call list_one_integrations once and confirm AgentMail is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.

Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.

Before a write

Creates, updates, deletes and sends land on a real AgentMail account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.

Actions

Webhooks

Action	Method	Path	Action id
Get a Webhook	GET	/v0/webhooks/{{webhookId}}	conn_mod_def::GJz8Fx3wYKw::n7c1CqozSt69qvgGnYVccQ
List Webhooks	GET	/v0/webhooks	conn_mod_def::GJz8F9KfF8Q::M3GmKlCsSZ-6OJX1PiAttw
Create a Webhook	POST	/v0/webhooks	conn_mod_def::GJz8FhvKqbM::hiH5HyAtQF2U1uk_lsB7rA
Delete a Webhook	DELETE	/v0/webhooks/{{webhookId}}	conn_mod_def::GJz8Fp1T2wk::HHoSQM50RoiMVHmqeqmpnQ
Domain Verified (Webhook Event)	POST	/webhooks/domain-verified	conn_mod_def::GJz7-rTyssg::LvdrQxxPRdih0T9ZslxTsg
Message Bounced (Webhook Event)	POST	/webhooks/message-bounced	conn_mod_def::GJz7-zoKySI::4Tb8NY8TQiO3r8b-fb1lWQ
Message Delivered (Webhook Event)	POST	/webhooks/message-delivered	conn_mod_def::GJz7_EV3yVo::jFstAxZqRjqDHG4k6n9J8A
Message Rejected (Webhook Event)	POST	/webhooks/message-rejected	conn_mod_def::GJz7_TUsZv8::SWhZULAFQyGnfkhyvQ6rGw
Message Sent (Webhook Event)	POST	``	conn_mod_def::GJz7_b9QkXQ::gd13n83eTRGvemrfj-fztw
Update a Webhook	PATCH	/v0/webhooks/{{webhookId}}	conn_mod_def::GJz8GEOcwik::HzjW8eN5Tf6xE21TG5qC8w