A dedicated email inbox owned by the agent, with its own email address. It can be used to send, receive, and manage email independently of the user's personal inbox.

Use it to send emails, read incoming messages, manage threads, register for services, or communicate with people and other agents.

It gives the agent a separate identity for email conversations, sign-ups, service authentication, and communication.

agentmail — Skill for Claude Code and Codex by cyborg-garden

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add cyborg-garden/hermes-agent-mt --skill agentmail

Clone the repo

git clone --depth 1 https://github.com/cyborg-garden/hermes-agent-mt

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/cyborg-garden/hermes-agent-mt/agentmail/github.svg)](https://agentmods.dev/skills/cyborg-garden/hermes-agent-mt/agentmail)

Your own site

<a href="https://agentmods.dev/skills/cyborg-garden/hermes-agent-mt/agentmail"><img src="https://agentmods.dev/badge/skills/cyborg-garden/hermes-agent-mt/agentmail/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/cyborg-garden/hermes-agent-mt/agentmail"><img src="https://agentmods.dev/badge/skills/cyborg-garden/hermes-agent-mt/agentmail.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 784 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 92% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00015	$0.00784
Opus 5.5	$0.00006	$0.00314
Sonnet 5.5	$0.00003	$0.00157
Haiku 4.5	$0.00002	$0.00078

Measured 20d ago against content hash 9d7f5cb6ff42, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agentmail scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 20d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

92% identical to agentmail — 158 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

optional-skills/email/agentmail/SKILL.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AgentMail Skill

AgentMail gives an agent its own email inbox for sending mail, receiving replies, completing email OTP flows, and running inbound email loops. Use it for agent-owned inboxes, not a user's existing IMAP/SMTP mailbox.

Use the agentmail CLI first. Use MCP only when the harness expects MCP tools; use REST only when the CLI is missing a required operation.

When to Use

The agent needs an email address it owns.
The task involves email OTP flows, replies, threads, labels, or attachments.
The agent needs webhook or WebSocket delivery for inbound mail.

Prerequisites

Run commands through the terminal tool.
Install the CLI:

npm install -g agentmail-cli@latest

Export an API key:

export AGENTMAIL_API_KEY="am_..."

No API key yet? Use signup.md.

How to Run

Use --format json whenever another command or script needs IDs.

agentmail inboxes list --format json

Quick Reference

AgentMail agent reference: hosted copy.
AgentMail: product landing page.
Console: API keys and account management.
Docs: full product documentation.
signup.md: self-signup and OTP verification.
core.md: inboxes, messages, threads, labels, attachments.
webhooks.md: events to a public HTTPS server.
websockets.md: events to a local agent process.
mcp.md: MCP integration.

Procedure

Install agentmail-cli@latest and verify agentmail inboxes list --format json.
If no API key is available, complete signup.md.
Use core.md for inbox, send, read, reply, forward, label, thread, and attachment flows.
Add webhooks.md or websockets.md only when polling is not enough.

Read the full file on GitHub · 96 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

20d ago Changed · -31 lines · -26 tokens per session 9d7f5cb6ff42
2mo ago First seen · 127 lines · 41 tokens per session scan A 12e10595db82

Subscribe to this mod's changes

agentmail is a skill published in the GitHub repository cyborg-garden/hermes-agent-mt (14 stars, last pushed today), licensed MIT. It adds 15 tokens to every session and 784 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 92% identical to agentmail, differing in 158 lines, and is treated as a copy.

Productivity agents ai hermes hermes-agent multi-tenant multiplayer

agentmail next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
agentmailcyborg-garden/hermes-agent-mt	Skill	14	today	MIT	A	15	Claude Code, Codex
hermes-memory-providersmnemosyne-oss/mnemosyne	Skill	3.6k	today	MIT	A	34	Claude Code, Codex
mnemosynemnemosyne-oss/mnemosyne	Skill	3.6k	today	MIT	A	22	Claude Code, Codex
mnemosyne-memory-overridemnemosyne-oss/mnemosyne	Skill	3.6k	today	MIT	A	101	Claude Code, Codex
agent-cardsthomasbek3/hermes-bot-kit	Skill	222	today	MIT	A	30	Claude Code, Codex
email-draftsthomasbek3/hermes-bot-kit	Skill	222	today	MIT	A	30	Claude Code, Codex
vrchat-group-queriesggg123124/vrchat-assistant	Skill	30	8d ago	MIT	A	20	Claude Code, Codex