agentmail

Manage inboxes, messages, and webhooks via the AgentMail API.

3|1|Updated Jan 16, 2026
One-click install
npx skills add https://github.com/agentmail-to/agentmail-claude-skill --skill agentmail-agentmail-to
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: agentmail
Source: https://github.com/agentmail-to/agentmail-claude-skill/tree/main
Command: npx skills add https://github.com/agentmail-to/agentmail-claude-skill --skill agentmail-agentmail-to

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Building and operating reliable, automated email agents is complex: developers must manage inboxes, threading, attachments, deliverability, idempotency, and real-time events while integrating AI for content and decision-making. This Skill centralizes the operational patterns, API usage, and best practices needed to run production-grade email automation and agent workflows.

Core Features & Use Cases

  • Inbox & Message Management: Create and manage inboxes, send messages, reply, list messages/threads, update labels, and handle attachments and drafts.
  • Event-driven Automation: Guide for webhooks and WebSocket listeners to receive real-time message.received events and process them safely (return 200 immediately, background processing).
  • AI Agent Integration: Examples and patterns for using agentmail-toolkit with OpenAI and LangChain to build autonomous or human-in-the-loop agents.
  • Operational Best Practices: Idempotency keys for create operations, bounce/complaint handling, DKIM/SPF/DKIM gotchas, multi-tenant pods, and deliverability thresholds.
  • Use Cases: Customer support autoresponders, outreach campaigns, multi-tenant agent platforms, attachment processing pipelines, and supervised workflows with drafts.

Quick Start

Use the agentmail skill to create an inbox named my-agent and send a welcome email to [email protected].

Frequently Asked Questions about agentmail

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build an autonomous email agent to automate inbox management?

To build an autonomous email agent, use this Skill to manage inboxes, threads, and messages via the AgentMail API. It provides operational patterns for automating customer support, outreach sequences, and event-driven workflows.

How do I set up webhooks and WebSocket listeners for realtime email automation?

For realtime email automation, configure webhook endpoints and WebSocket listeners to receive message.received events. Return a 200 response immediately and process the email content safely in the background.

Can I use AI email agents with OpenAI and LangChain for automated outreach?

Yes, you can integrate AI email agents with OpenAI and LangChain using the agentmail-toolkit. This supports building autonomous agents and human-in-the-loop supervised workflows for outreach campaigns.

What are the best practices for email deliverability and idempotency in email automation?

Email automation best practices include using idempotency keys for create operations to prevent duplicates, handling bounce and complaint notifications, and maintaining proper DKIM and SPF records for deliverability.

Does this approach support multi-tenant email agent platforms and attachment processing?

Yes, the Skill supports multi-tenant pods for isolated platform environments and includes capabilities for attachment processing pipelines, label management, and draft creation within automated workflows.

Why do my automated email sends fail when creating multiple inboxes concurrently?

Concurrent inbox creation can fail without proper idempotency keys. Apply idempotency keys to all create operations to ensure safe retries and prevent duplicate resource generation during automated email workflows.