atomicmail

An email skill that connects an AI agent to a programmable inbox using JMAP, an email API. It also supports creating an inbox and managing authentication.

In plain words
What is it for?
Use it to register or access an inbox, list mailboxes, read messages, and send email.
Why use it?
It lets an agent handle email through structured requests instead of manually operating a mail application.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/atomic-mail/atomic-mail-agentic/docs
Any agent
npx skills add Atomic-Mail/atomic-mail-agentic --skill docs
Clone the repo
git clone --depth 1 https://github.com/Atomic-Mail/atomic-mail-agentic

Made for: Claude Code, Codex.

Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,025 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00054 $0.02025
Opus 5 $0.00027 $0.01012
Sonnet 5 $0.00011 $0.00405
Haiku 4.5 $0.00005 $0.00202

Measured 2d ago against content hash 48e7d19e3351, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

atomicmail 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 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (.vitepress/theme/index.ts), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

docs/SKILL.md · 199 lines

How it starts

The opening of the file, as written. The whole thing — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Atomic Mail

Atomic Mail exposes a programmable inbox over JMAP with PoW signup and JWT rotation. This skill ships a single CLI entrypoint with three commands: register, jmap_request, and help — matching the MCP server.

When to use this skill

  • Register a new inbox or log in with an existing API key.
  • Send JMAP batches (inline JSON or preset files).
  • Read built-in documentation (JMAP cheatsheet, presets, troubleshooting). In this skill runtime, atomicmail help --topic readme intentionally returns a short stub.

Call atomicmail help early and often — before guessing placeholders, using URNs, or cron setup. Start with help --topic overview, then presets before custom jmap_request calls and cron after register. If installed behavior disagrees with docs elsewhere, trust help from the running package.

Commands

npx --package=@atomicmail/agent-skill-gh-pages atomicmail register --username "myagent" --watch scheduled

npx --package=@atomicmail/agent-skill-gh-pages atomicmail jmap_request --ops-file list_inbox.json

Run atomicmail --help or atomicmail <command> --help for flags.

Defaults

  • authUrl: https://auth.atomicmail.ai
  • apiUrl: https://api.atomicmail.ai
  • credentials directory: ~/.atomicmail

Workflow

1. Register (new account)

npx --package=@atomicmail/agent-skill-gh-pages atomicmail register \
  --username "alice" \
  --watch scheduled

--watch is required — it is your operator's decision, not yours; ask them. Run register with no --watch to see the accepted values (each is a real choice about how the operator works, so neither is a safe default to guess). On the scheduling value, register prints the per-host schedule setup command.

Writes credentials.json, session.jwt, capability.jwt. Prints JSON including inbox and accountId.

Required next step: the watch value decides who reads the inbox (see Inbox checks). On scheduled, schedule a daily agent turn with list_inbox.json on your runtime's own scheduler — never at the OS level, and never cron atomicmail jmap_request alone.

Read the full file on GitHub · 199 lines

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.

  1. 2d ago First seen · 199 lines · 54 tokens per session scan A 48e7d19e3351

Subscribe to this mod's changes

atomicmail is a skill published in the GitHub repository Atomic-Mail/atomic-mail-agentic (256 stars, last pushed 6d ago), licensed MIT. It adds 54 tokens to every session and 2,025 once invoked, about $0.0003 per session on Opus 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.

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