pip install mattermost-cli    # adds `mm` to PATH
# or
pipx install mattermost-cli   # isolated global install
# or
uvx --from mattermost-cli mm  # run without installing (needs uvx)

Then authenticate (one-time):

mm login --url https://your.mattermost.server
mm whoami   # verify

The login command will prompt for credentials interactively. If your server supports Personal Access Tokens (Profile > Security > Personal Access Tokens in the Mattermost UI), you can skip the prompt:

mm login --url https://your.mattermost.server --token YOUR_TOKEN

For environment variables, multiple servers, and troubleshooting, see references/setup.md.

Start here: `mm overview`

Always run this first. It returns mentions, unread channels, and active channels in a single call.

mm overview              # last 6 hours (default)
mm overview --since 1d   # last 24 hours

The response has three sections:

mentions - posts that @-mention you, with root message context when it's a reply
unread - channels with unread messages, sorted by count
active_channels - channels with recent posts, sorted by recency

Each entry includes a ref field you can pass directly to other commands.

Reading messages

mm messages <channel>                   # last 30 messages, chronological
mm messages <channel> --since 2h        # messages from last 2 hours
mm messages <channel> --threads         # thread index: root + reply count + last reply
mm messages @username                   # DMs with someone

<channel> accepts a name (off-topic), @username for DMs, or a channel ID (for group DMs from overview output).

Threads

Every post includes a thread_id. Use it to read the full conversation:

mm thread <thread_id>                   # root + last 9 replies
mm thread <thread_id> --limit 0         # entire thread
mm thread <thread_id> --since 1h        # just recent replies (root always included)

Searching and mentions

mm search "deployment issue"
mm search "from:alice in:devops after:2025-01-01"
mm mentions                             # @-mentions in last 24h
mm mentions --since 3d

Mentions for replies include a root field with the original message, so you know what "this" or "it" refers to without a follow-up call.

Channel context

mm channel <name>                       # purpose, header, member/pinned count
mm pinned <channel>                     # important/pinned posts
mm members <channel>                    # who's here + online status
mm channels --since 6h                  # all channels with recent activity
mm channels --type dm                   # just DMs

People

mm user @someone                        # profile, role, status, timezone

Key JSON fields

Every post includes these fields so you can navigate without guesswork:

Field	What it's for
`thread_id`	Pass to `mm thread` to read full conversation
`ref`	On channel entries; pass to `mm messages`
`is_bot` / `bot_name`	Webhook and bot posts are flagged automatically
`root`	On reply-mentions; the original message being replied to
`is_reply` / `reply_count`	Thread structure
`reactions`	Emoji counts like `{"+1": 3, "white_check_mark": 1}`

Bot posts from webhooks automatically extract alert content from Slack-format attachments, so you see the actual alert text instead of empty messages.

Start here: mm overview

mattermost

Mattermost CLI (mm)

Setup

Mattermost CLI (`mm`)