AgentDraft vs. AgentMail.
Short answer: different shapes, overlapping use cases. AgentMail gives AI agents an email inbox. AgentDraft gives them an inbox and a calendar coordination layer, so the agent can read mail, check availability, and book meetings — without colliding with the other agents on the same calendar.
If your agent only needs an inbox, AgentMail is a fine choice. If it has to schedule anything, or if more than one agent writes to a shared calendar, you want AgentDraft.
Updated
AgentMail's positioning, in their own words: "Email Inbox API for AI Agents… create, send, receive, and search messages via REST API — built for autonomous agents and agentic workflows." It's an inbox. A good one, with a developer-first surface and ergonomic SDKs for the LangChain/CrewAI/AutoGen path.
AgentDraft is the ops API for AI agents — inbox plus calendar. The mailbox surface is similar in shape: every agent gets a real, addressable inbox; mail comes in, mail goes out, replies thread. The calendar surface is what doesn't have an equivalent on the other side — a coordination layer that resolves races between multiple agents writing to the same calendar at the storage level, so exactly one agent's booking wins per slot and every loser gets a typed 409 with the winner's identity and an audit reference.
| Comparison point | AgentMail | AgentDraft |
|---|---|---|
| Primary surface | Inbox API for AI agents | Inbox API + calendar coordination layer |
| Agent inbox | Yes — addressable, REST API, send/receive/search | Yes — addressable, REST API, send/receive/reply, audit-logged |
| Calendar / scheduling | Not part of the product | First-class: GET /v1/availability, POST /v1/bookings, holds, webhooks |
| Multi-agent race protection on a shared calendar | Out of scope | Storage-level conditional writes; the check is the write |
| Priority resolution between agents | N/A (no calendar) | Per-user ranked agents; explicit tiebreak; configurable bump window |
| Audit trail | Inbox history | Append-only log across mail, holds, commits, evictions, rule changes |
| Framework support | LangChain, CrewAI, AutoGen via REST + SDKs | Python + TypeScript SDKs, agentdraft-langchain, MCP server |
| Underlying calendar | — | Connects to Google Calendar, Microsoft 365, Apple iCloud, CalDAV — we are not a calendar store |
AgentMail rows reflect the public product surface at agentmail.to at the time of publication. If we've mis-stated a feature, please tell us and we'll correct it.
- AgentMail. Your agent's job is to send and receive email. It doesn't need to know anything about calendars, and you're not worried about other agents writing to the same user's anything. AgentMail is a focused tool for that case.
- AgentDraft. Your agent has to schedule things — discovery calls, support handoffs, focus time, recruit pipelines — and is one of several agents on the user's calendar. You want a single coordination layer in front of the calendar so two agents never write to the same slot, and you want the same mailbox surface in the same product so the agent can read the inbound mail that triggered the meeting in the first place.
- Both. Fine. Run AgentMail for the mail plane your agent is already wired to, point bookings at AgentDraft, and let the conflict engine handle the calendar side. The two products don't fight.
A scheduling agent is almost never only a scheduling agent. The booking is triggered by mail; the confirmation goes out as mail; the reschedule comes back as mail. Splitting the agent's inbox and the agent's calendar across two vendors means two API surfaces, two billing meters, two audit logs, and one extra integration each time you change anything. We built AgentDraft as one ops API for the same reason: every agent needs an inbox and a calendar, and we give it both.
Frequently asked
Is AgentDraft a replacement for AgentMail?
No. They solve adjacent problems. AgentMail gives a single agent an email inbox. AgentDraft gives every agent on a calendar a coordinated booking surface — and an inbox alongside it. If your agent only reads mail, AgentMail is enough. If it has to schedule anything, or if multiple agents share the calendar, you want AgentDraft.
Can I use AgentMail and AgentDraft together?
Yes. AgentMail handles the inbox; AgentDraft's calendar API resolves multi-agent races. There is no overlap on writes. Most teams that start with AgentMail and add scheduling later end up with both.
Does AgentDraft give my agent its own email address?
Yes. Each agent gets a per-agent inbound mailbox (derived per workspace via HMAC) that accepts external email and surfaces it to the agent via webhook or API. Use this for invite parsing, reply threads, or any flow where the agent reads mail.
- Why AI scheduling agents collide — and what a coordination layer looks like — why the calendar half of this matters.
- Calendar API for AI agents — the scheduling surface AgentMail doesn't have.
- AgentDraft vs. Cal.com — the related comparison if your agent uses Cal.com to book.