How do I install the Agentmail CLI skill?

Run npx skillmds@latest add kbarbel640-del/agentmail-cli in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Agentmail CLI safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Agentmail CLI?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Agentmail CLI free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Agentmail CLI?

kbarbel640-del (@kbarbel640-del) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Agentmail CLI by kbarbel640-del — Agent Skill

Name: Agentmail CLI
Rating: 4.5 (4 reviews)
Author: kbarbel640-del

Agentmail CLI

Manage email inboxes and messages via AgentMail API. Create disposable inboxes, send/receive emails, and list messages. Use when the agent needs to send or receive email, create temporary inboxes, or check for incoming messages.

kbarbel640-del Updated Sep 8, 2026 1 repo stars

File contents

CLI for AgentMail — create inboxes, send messages, and read email.

API Key Setup

The API key MUST be configured before any command will work. Two methods:

Config file (preferred for persistent agents):

agentmail config set-key YOUR_API_KEY

This stores the key at ~/.agentmail/config.json and persists across sessions.

Environment variable:

export AGENTMAIL_API_KEY=YOUR_API_KEY

Verify configuration:

agentmail config show

If commands fail with auth errors, re-run agentmail config set-key — the env var alone may not persist between shell sessions.

Always Use --json

Always pass --json to every command for machine-readable output. Parse with jq when needed.

Inbox Commands

Create an inbox:

agentmail inbox create --json
agentmail inbox create --domain example.com --json
agentmail inbox create --username support --domain example.com --display-name "Support Team" --json

List inboxes:

agentmail inbox list --json
agentmail inbox list --limit 10 --json

Get inbox details:

agentmail inbox get <inbox-id> --json

Delete an inbox:

agentmail inbox delete <inbox-id>

Message Commands

Send a message:

agentmail message send --from <inbox-id> --to recipient@example.com --subject "Subject" --text "Body text" --json

Send with HTML:

agentmail message send --from <inbox-id> --to recipient@example.com --subject "Subject" --html "<h1>Hello</h1>" --json

Multiple recipients, CC, BCC:

agentmail message send --from <inbox-id> --to "a@example.com,b@example.com" --cc "cc@example.com" --bcc "bcc@example.com" --subject "Subject" --text "Body" --json

List messages in an inbox:

agentmail message list <inbox-id> --json
agentmail message list <inbox-id> --limit 20 --json

Get a specific message:

agentmail message get <inbox-id> <message-id> --json

Delete a message (deletes entire thread):

agentmail message delete <inbox-id> <message-id>

Common Workflow

# 1. Create inbox, capture ID
INBOX_ID=$(agentmail inbox create --json | jq -r '.inboxId')

# 2. Send email
agentmail message send --from "$INBOX_ID" --to user@example.com --subject "Hello" --text "Message body" --json

# 3. Check for replies
agentmail message list "$INBOX_ID" --json

Notes

Get an API key at https://agentmail.to
Config file location: ~/.agentmail/config.json
Env var AGENTMAIL_API_KEY takes precedence over config file
Deleting a message deletes the entire thread containing it

---name: agentmail-clidescription: Manage email inboxes and messages via AgentMail API. Create disposable inboxes, send/receive emails, and list messages. Use when the agent needs to send or receive email, create temporary inboxes, or check for incoming messages.---CLI for [AgentMail](https://agentmail.to) — create inboxes, send messages, and read email.## API Key SetupThe API key MUST be configured before any command will work. Two methods:1. **Config file (preferred for persistent agents):**```agentmail config set-key YOUR_API_KEY```This stores the key at `~/.agentmail/config.json` and persists across sessions.2. **Environment variable:**```export AGENTMAIL_API_KEY=YOUR_API_KEY```Verify configuration:```agentmail config show```If commands fail with auth errors, re-run `agentmail config set-key` — the env var alone may not persist between shell sessions.## Always Use --jsonAlways pass `--json` to every command for machine-readable output. Parse with `jq` when needed.## Inbox CommandsCreate an inbox:```agentmail inbox create --jsonagentmail inbox create --domain example.com --jsonagentmail inbox create --username support --domain example.com --display-name "Support Team" --json```List inboxes:```agentmail inbox list --jsonagentmail inbox list --limit 10 --json```Get inbox details:```agentmail inbox get <inbox-id> --json```Delete an inbox:```agentmail inbox delete <inbox-id>```## Message CommandsSend a message:```agentmail message send --from <inbox-id> --to recipient@example.com --subject "Subject" --text "Body text" --json```Send with HTML:```agentmail message send --from <inbox-id> --to recipient@example.com --subject "Subject" --html "<h1>Hello</h1>" --json```Multiple recipients, CC, BCC:```agentmail message send --from <inbox-id> --to "a@example.com,b@example.com" --cc "cc@example.com" --bcc "bcc@example.com" --subject "Subject" --text "Body" --json```List messages in an inbox:```agentmail message list <inbox-id> --jsonagentmail message list <inbox-id> --limit 20 --json```Get a specific message:```agentmail message get <inbox-id> <message-id> --json```Delete a message (deletes entire thread):```agentmail message delete <inbox-id> <message-id>```## Common Workflow```bash# 1. Create inbox, capture IDINBOX_ID=$(agentmail inbox create --json | jq -r '.inboxId')# 2. Send emailagentmail message send --from "$INBOX_ID" --to user@example.com --subject "Hello" --text "Message body" --json# 3. Check for repliesagentmail message list "$INBOX_ID" --json```## Notes- Get an API key at https://agentmail.to- Config file location: `~/.agentmail/config.json`- Env var `AGENTMAIL_API_KEY` takes precedence over config file- Deleting a message deletes the entire thread containing it

Frequently asked questions