What is agentmail-cli?

A command-line tool for operating AgentMail from a shell or script.

Use it to list or create inboxes, read and search messages, send or reply to email, manage drafts, and produce JSON or YAML output.

It avoids needing a separate application when you want to manage email through terminal commands.

agentmail-cli — Skill for Claude Code and Codex by agentmail-to

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 agentmail-to/agentmail-plugins --skill agentmail-cli

Clone the repo

git clone --depth 1 https://github.com/agentmail-to/agentmail-plugins

Made for: Claude Code, Codex.

Or install agentmail, the plugin that ships this one along with the rest of its 9 skills, 1 MCP server.

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/agentmail-to/agentmail-plugins/agentmail-cli/github.svg)](https://agentmods.dev/skills/agentmail-to/agentmail-plugins/agentmail-cli)

Your own site

<a href="https://agentmods.dev/skills/agentmail-to/agentmail-plugins/agentmail-cli"><img src="https://agentmods.dev/badge/skills/agentmail-to/agentmail-plugins/agentmail-cli/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/agentmail-to/agentmail-plugins/agentmail-cli"><img src="https://agentmods.dev/badge/skills/agentmail-to/agentmail-plugins/agentmail-cli.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 995 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found 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	$0.00061	$0.00995
Opus 5.5	$0.00024	$0.00398
Sonnet 5.5	$0.00012	$0.00199
Haiku 4.5	$0.00006	$0.00100

Measured 1mo ago against content hash 265ed5d91b28, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agentmail-cli 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 1mo 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.

skills/agentmail-cli/SKILL.md · 124 lines

How it starts

The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AgentMail CLI

Install the CLI and provide the API key through the environment.

npm install -g agentmail-cli
export AGENTMAIL_API_KEY="am_..."

A resource nested under another is a nested subcommand, e.g. inboxes messages, inboxes threads, pods inboxes, pods threads (CLI 1.x; the colon form inboxes:messages is rejected). Run agentmail <resource> --help to list what a resource supports.

Inboxes

agentmail inboxes list
agentmail inboxes get --inbox-id <inbox_id>
agentmail inboxes create --display-name "Support Agent" --username support
agentmail inboxes delete --inbox-id <inbox_id>

Confirm the exact inbox before running the destructive delete command.

Messages and threads

agentmail inboxes messages list --inbox-id <inbox_id>
agentmail inboxes messages get --inbox-id <inbox_id> --message-id <message_id>

agentmail inboxes messages send --inbox-id <inbox_id> \
  --to "[email protected]" \
  --subject "Hello" \
  --text "Message body"

# HTML body instead of plain text
agentmail inboxes messages send --inbox-id <inbox_id> \
  --to "[email protected]" \
  --subject "Hello" \
  --html "<h1>Hello</h1>"

agentmail inboxes messages reply --inbox-id <inbox_id> \
  --message-id <message_id> \
  --text "Reply body"

agentmail inboxes messages forward --inbox-id <inbox_id> \
  --message-id <message_id> \
  --to "[email protected]"

agentmail inboxes threads list --inbox-id <inbox_id>
agentmail inboxes threads get --inbox-id <inbox_id> --thread-id <thread_id>

Use a message ID for replies. Fetch the full message before relying on body content.

Drafts

agentmail inboxes drafts create --inbox-id <inbox_id> \
  --to "[email protected]" \
  --subject "Pending approval" \
  --text "Draft body"

agentmail inboxes drafts list --inbox-id <inbox_id>
agentmail inboxes drafts get --inbox-id <inbox_id> --draft-id <draft_id>
agentmail inboxes drafts send --inbox-id <inbox_id> --draft-id <draft_id>

Pods

Read the full file on GitHub · 124 lines

Files

What ships with it

1 file 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.

agents/openai.yaml 225 B

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.

1mo ago Changed 265ed5d91b28
2mo ago First seen · 124 lines · 61 tokens per session scan A 69aa94399ec3

Subscribe to this mod's changes

agentmail-cli is a skill published in the GitHub repository agentmail-to/agentmail-plugins (36 stars, last pushed 11d ago), licensed MIT. It adds 61 tokens to every session and 995 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Productivity

agentmail-cli next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
agentmail-cliagentmail-to/agentmail-plugins	Skill	36	11d ago	MIT	A	61	Claude Code, Codex
orbit-notionnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	117	Claude Code, Codex
agentmailpaperclipai/paperclip	Skill	111k	yesterday	MIT	A	30	Claude Code, Codex
Cortexdanielmiessler/LifeOS	Skill	20k	yesterday	MIT	A	184	Claude Code
rowboat-spacesrowboatlabs/rowboat	Skill	18k	yesterday	Apache-2.0	A	60	Claude Code, Codex
feishuHmbown/CodeWhale	Skill	41k	5d ago	MIT	A	33	Claude Code, Codex
pinchtab-mcppinchtab/pinchtab	Skill	11k	10d ago	MIT	A	52	Claude Code, Codex