nousresearch/hermes-agent/himalaya

Himalaya Email CLI

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

This skill is separate from the Hermes Email gateway adapter. The gateway adapter lets people email the agent and uses Hermes' built-in IMAP/SMTP adapter; this skill lets the agent operate a mailbox from terminal tools and requires the external himalaya CLI.

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)

Installation

# Pre-built binary (Linux/macOS — recommended)
curl -sSL https://raw.githubusercontent.com/pimalaya/himalaya/master/install.sh | PREFIX=~/.local sh
 
# macOS via Homebrew
brew install himalaya
 
# Or via cargo (any platform with Rust)
cargo install himalaya --locked

Configuration Setup

Run the interactive wizard to set up an account:

himalaya account configure

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

[accounts.personal]
email = "you@example.com"
display-name = "Your Name"
default = true
 
backend.type = "imap"
backend.host = "imap.example.com"
backend.port = 993
backend.encryption.type = "tls"
backend.login = "you@example.com"
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 = "you@example.com"
message.send.backend.auth.type = "password"
message.send.backend.auth.cmd = "pass show email/smtp"
 
# Folder aliases (himalaya v1.2.0+ syntax). Required whenever the
# server's folder names don't match himalaya's canonical names
# (inbox/sent/drafts/trash). Gmail is the common case — see
# `references/configuration.md` for the `[Gmail]/Sent Mail` mapping.
folder.aliases.inbox = "INBOX"
folder.aliases.sent = "Sent"
folder.aliases.drafts = "Drafts"
folder.aliases.trash = "Trash"

Heads up on the alias syntax. Pre-v1.2.0 docs used a

[accounts.NAME.folder.alias] sub-section (singular alias).

v1.2.0 silently ignores that form — TOML parses fine, but the

alias resolver never reads it, so every lookup falls through to

the canonical name. On Gmail this means save-to-Sent fails after

SMTP delivery succeeds, and himalaya message send exits non-zero.

Any caller (agent, script, user) that retries on that exit code

will re-run the entire send — including SMTP — producing duplicate

emails to recipients. Always use folder.aliases.X (plural, dotted

keys, directly under [accounts.NAME]).

Hermes Integration Notes

• Reading, listing, searching, moving, deleting all work directly through the terminal tool
• Composing/replying/forwarding — piped input (cat << EOF | himalaya template send) is recommended for reliability. Interactive $EDITOR mode works with pty=true + background + process tool, but requires knowing the editor and its commands
• Use --output json for structured output that's easier to parse programmatically
• The himalaya account configure wizard requires interactive input — use PTY mode: terminal(command="himalaya account configure", pty=true)

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 john@example.com 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

To reply non-interactively from Hermes, read the original message, compose a reply, and pipe it:

# Get the reply template, edit it, and send
himalaya template reply 42 | sed 's/^$/\nYour reply text here\n/' | himalaya template send

Or build the reply manually:

cat << 'EOF' | himalaya template send
From: you@example.com
To: sender@example.com
Subject: Re: Original Subject
In-Reply-To: <original-message-id>
 
Your reply here.
EOF

Reply-all (interactive — needs $EDITOR, use template approach above instead):

himalaya message reply 42 --all

Forward an Email

# Get forward template and pipe with modifications
himalaya template forward 42 | sed 's/^To:.*/To: newrecipient@example.com/' | himalaya template send

Write a New Email

Non-interactive (use this from Hermes) — pipe the message via stdin:

cat << 'EOF' | himalaya template send
From: you@example.com
To: recipient@example.com
Subject: Test Message
 
Hello from Himalaya!
EOF

Or with headers flag:

himalaya message write -H "To:recipient@example.com" -H "Subject:Test" "Message body here"

Note: himalaya message write without piped input opens $EDITOR. This works with pty=true + background mode, but piping is simpler and more reliable.

Move/Copy Emails

Move to folder (target folder comes first, then the message ID):

himalaya message move "Archive" 42

Copy to folder (target folder comes first, then the message ID):

himalaya message copy "Important" 42

Delete an Email

himalaya message delete 42

Manage Flags

Add flag:

himalaya flag add 42 --flag seen

Remove flag:

himalaya flag remove 42 --flag seen

Multiple Accounts

List accounts:

himalaya account list

Use a specific account:

himalaya --account work envelope list

Attachments

Save attachments from a message:

himalaya attachment download 42

Save to specific directory:

himalaya attachment download 42 --downloads-dir ~/Downloads

Output Formats

Most commands support --output for structured output:

himalaya envelope list --output json
himalaya envelope list --output plain

Debugging

Enable debug logging:

RUST_LOG=debug himalaya envelope list

Full trace with backtrace:

RUST_LOG=trace RUST_BACKTRACE=1 himalaya envelope list

Tips

• Use himalaya --help or himalaya <command> --help for detailed usage.
• Message IDs are relative to the current folder; re-list after folder changes.
• For composing rich emails with attachments, use MML syntax (see references/message-composition.md).
• Store passwords securely using pass, system keyring, or a command that outputs the password.