A set of Node.js tools for working with JMAP email servers, including FastMail, Cyrus IMAP, and Stalwart Mail Server. JMAP is a standard way for applications to access and manage email.

Listing or searching messages, viewing mailboxes, reading email content, moving messages, and deleting messages when the required server credentials are available.

It provides ready-made commands for common email tasks instead of requiring you to build those operations yourself.

jmap-email — Skill for Claude Code and Codex by jacobrask

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/jacobrask/claude-skills

agentmods

npx agentmods add skills/jacobrask/claude-skills/jmap-email

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/jacobrask/claude-skills/jmap-email/github.svg)](https://agentmods.dev/skills/jacobrask/claude-skills/jmap-email)

Your own site

<a href="https://agentmods.dev/skills/jacobrask/claude-skills/jmap-email"><img src="https://agentmods.dev/badge/skills/jacobrask/claude-skills/jmap-email/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/jacobrask/claude-skills/jmap-email"><img src="https://agentmods.dev/badge/skills/jacobrask/claude-skills/jmap-email.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,025 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 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	$0.00057	$0.01025
Opus 5	$0.00028	$0.00513
Sonnet 5	$0.00011	$0.00205
Haiku 4.5	$0.00006	$0.00103

Measured 9d ago against content hash 674349a4f255, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

jmap-email 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 9d ago.

The scan reads SKILL.md. This mod also ships 55 executable files (node_modules/@types/node/assert.d.ts, node_modules/@types/node/assert/strict.d.ts, node_modules/@types/node/async_hooks.d.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.

skills/jmap-email/SKILL.md · 116 lines

How it starts

The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.

JMAP Email Access

Access JMAP email servers (FastMail, Cyrus IMAP, Stalwart) using pre-built scripts.

Prerequisites

Environment variables must be set before launching Claude Code:

JMAP_SESSION_URL - JMAP server session URL
JMAP_BEARER_TOKEN - Authentication bearer token
JMAP_ACCOUNT_ID - Account ID (optional, auto-detected)

Available Scripts

Choose the right script:

Browse recent emails? → Use list-emails.ts (supports --unread, --flagged, --mailbox, --from, --limit filters)
Search by sender? → Use list-emails.ts --from "[email protected]"
Search for multiple keywords? → Use search-keywords.ts keyword1 keyword2 ...
Get full email content? → Use get-email.ts with email ID
View folder structure? → Use list-mailboxes.ts
Move emails by ID? → Use move-by-ids.ts --mailbox <name> <id1> <id2> ...
Delete emails? → Use delete-emails.ts <id1> <id2> ...

All scripts support --help for detailed usage.

Common Tasks

Browse unread emails

node scripts/list-emails.ts --unread
node scripts/list-emails.ts --unread --limit 50

Find emails from specific sender

node scripts/list-emails.ts --from "[email protected]"
node scripts/list-emails.ts --from "[email protected]" --unread

Search for receipts or specific content

node scripts/search-keywords.ts "invoice" "receipt" "order confirmation"
node scripts/search-keywords.ts --mailbox "Archive" --limit 10 "meeting" "agenda"

Note: Search shows previews only. For full email content, use get-email.ts with the email ID.

Get full email content

node scripts/get-email.ts <email-id>

Organize emails (classification workflow)

Search for candidates: search-keywords.ts "keyword1" "keyword2"
Review previews and identify relevant email IDs
(Optional) View full content: get-email.ts <email-id>
Move to target mailbox: move-by-ids.ts --mailbox @MailboxName id1 id2 id3

Interactive email triage

Workflow for processing new emails with learning:

Read the full file on GitHub · 116 lines

Files

What ships with it

60 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.

9d ago First seen · 116 lines · 57 tokens per session scan A 674349a4f255

Subscribe to this mod's changes

jmap-email is a skill published in the GitHub repository jacobrask/claude-skills (5 stars, last pushed 8mo ago), licensed MIT. It adds 57 tokens to every session and 1,025 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 2026-08-31.

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jmap-email