himalaya

A terminal email client for managing messages through email servers such as IMAP and SMTP. It supports multiple accounts and composing messages from the command line.

In plain words
What is it for?
Use it to list, read, search, write, reply to, forward, send, and organize email from the terminal.
Why use it?
It lets developers handle email without switching to a graphical mail application, once the account and server credentials are configured.

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/the-open-agent/openagent/himalaya
Any agent
npx skills add the-open-agent/openagent --skill himalaya
Clone the repo
git clone --depth 1 https://github.com/the-open-agent/openagent

Made for: Claude Code, Codex.

Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,109 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 $0.00055 $0.01109
Opus 5 $0.00028 $0.00554
Sonnet 5 $0.00011 $0.00222
Haiku 4.5 $0.00006 $0.00111

Measured yesterday against content hash 496b5ea270ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

himalaya 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 yesterday.

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

Copies of this mod

8 near-identical copies found in the catalogue:

  • himalaya — 94% identical, 17 lines differ
  • himalaya — 94% identical, 17 lines differ
  • himalaya — 92% identical, 17 lines differ
  • himalaya — 92% identical, 17 lines differ
  • himalaya — 92% identical, 17 lines differ
  • himalaya — 92% identical, 17 lines differ
  • himalaya — 92% identical, 17 lines differ
  • himalaya — 92% identical, 17 lines differ
skills/himalaya/SKILL.md · 245 lines

How it starts

The opening of the file, as written. The whole thing — 245 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Himalaya Email CLI

Himalaya is a CLI email client that lets you manage emails from the terminal using IMAP, SMTP, Notmuch, or Sendmail backends.

References

  • references/configuration.md (config file setup + IMAP/SMTP authentication)
  • references/message-composition.md (MML syntax for composing emails)

Prerequisites

  1. Himalaya CLI installed (himalaya --version to verify)
  2. A configuration file at ~/.config/himalaya/config.toml
  3. IMAP/SMTP credentials configured (password stored securely)

Configuration Setup

Run the interactive wizard to set up an account:

himalaya account configure

Or create ~/.config/himalaya/config.toml manually:

[accounts.personal]
email = "[email protected]"
display-name = "Your Name"
default = true

backend.type = "imap"
backend.host = "imap.example.com"
backend.port = 993
backend.encryption.type = "tls"
backend.login = "[email protected]"
backend.auth.type = "password"
backend.auth.cmd = "pass show email/imap"  # or use keyring

message.send.backend.type = "smtp"
message.send.backend.host = "smtp.example.com"
message.send.backend.port = 587
message.send.backend.encryption.type = "start-tls"
message.send.backend.login = "[email protected]"
message.send.backend.auth.type = "password"
message.send.backend.auth.cmd = "pass show email/smtp"

Common Operations

List Folders

himalaya folder list

List Emails

List emails in INBOX (default):

himalaya envelope list

List emails in a specific folder:

himalaya envelope list --folder "Sent"

List with pagination:

himalaya envelope list --page 1 --page-size 20

Search Emails

himalaya envelope list from [email protected] subject meeting

Read an Email

Read email by ID (shows plain text):

himalaya message read 42

Export raw MIME:

himalaya message export 42 --full

Reply to an Email

Interactive reply (opens $EDITOR):

himalaya message reply 42

Read the full file on GitHub · 245 lines

Files

What ships with it

2 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.

  1. yesterday First seen · 245 lines · 55 tokens per session scan A 496b5ea270ab

Subscribe to this mod's changes

himalaya is a skill published in the GitHub repository the-open-agent/openagent (5,592 stars, last pushed 11d ago), licensed Apache-2.0. It adds 55 tokens to every session and 1,109 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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