mattermost-cli

A CLI tool to fetch and display Mattermost messages (DMs, channels, threads) with automatic secret redaction for safe LLM processing.

Features

• Fetch DMs from all channels or filter by specific users
• Fetch messages from public/private channels via mm channel <name>
• Search messages with Mattermost query syntax via mm search <query>
• Find mentions via mm mentions (supports configurable aliases)
• Show unread summary via mm unread (optional --peek)
• Watch channel live via mm watch <channel>
• List all channel types via mm channels with --type filtering
• Thread-aware output by default (--no-threads to flatten)
• Fetch a single thread via mm thread <postId>
• Automatic detection and redaction of secrets (API keys, tokens, passwords, etc.)
• Multiple output formats: pretty terminal, markdown, JSON
• Time-based filtering (--since) and message limits (--limit)

Prerequisites

• Node.js >= 22.0.0 or Bun >= 1.0.0
• Mattermost personal access token

Installation

# npm
npm install -g mattermost-cli

# yarn
yarn global add mattermost-cli

# pnpm
pnpm add -g mattermost-cli

# bun
bun add -g mattermost-cli

Or run without installing:

bunx mattermost-cli

From source

git clone https://github.com/ardasevinc/mattermost-cli
cd mattermost-cli
bun install
bun link  # Makes `mm` available globally

Configuration

Configuration is resolved in this order: CLI flags → environment variables → config file

Option 1: Config file (recommended)

mm config --init  # Creates ~/.config/mattermost-cli/config.toml

Then edit the file:

# ~/.config/mattermost-cli/config.toml
url = "https://mattermost.example.com"
token = "your-personal-access-token"
# redact = false  # Uncomment to disable secret redaction
# mention_names = ["Arda", "arda.sevinc"]  # Optional aliases for `mm mentions`

Option 2: Environment variables

export MM_URL="https://mattermost.example.com"
export MM_TOKEN="your-personal-access-token"
# Optional: disable redaction globally
export MM_REDACT="false"

Option 3: CLI flags

mm --url https://mattermost.example.com --token your-token channels

Usage

List channels

mm channels
mm channels --json
mm channels --type public

Fetch direct messages

# All DMs from last 7 days
mm dms

# From specific user(s)
mm dms -u alice
mm dms -u alice -u bob

# With time filter
mm dms --since 24h
mm dms --since 30d --limit 100

# JSON output (for piping to other tools)
mm dms --json

# Flatten thread replies
mm dms --no-threads

mm dms --limit is a total output cap across all matched DM channels, not a per-channel cap.

Fetch a specific thread

mm thread <post-id>

Fetch a channel

mm channel general
mm channel #dev --team myteam

Search messages

mm search "deployment"
mm search "from:alice in:general after:2026-02-01"

Find mentions

mm mentions
mm mentions --since 7d
mm mentions --channel general --limit 20

Show unread channels

mm unread
mm unread --peek 5

Watch a channel live

mm watch general
mm watch dev --team myteam
mm watch --dm alice

Manage configuration

mm config           # Show config file status
mm config --path    # Print config file path
mm config --init    # Create config file with template

Options

Global:
  -t, --token <token>     Mattermost personal access token (or MM_TOKEN env)
  --url <url>             Mattermost server URL (or MM_URL env)
  --json                  Output as JSON
  --no-color              Disable colored output
  -r, --relative          Show relative times
  --no-relative           Show absolute times
  --redact                Enable secret redaction (default)
  --no-redact             Disable secret redaction (or MM_REDACT=false env)
  --threads               Show thread structure (default)
  --no-threads            Flatten thread replies

DMs:
  -u, --user <username>   Filter by username (repeatable)
  -l, --limit <number>    Max total messages across matched DMs (default: 50)
  -s, --since <duration>  Time range: "24h", "7d", "30d" (default: 7d)
  -c, --channel <id>      Specific channel ID

Channels:
  channels --type <type>  Filter list by type: dm, public, private, group, all

Channel:
  channel <name>          Fetch messages from one channel
  --team <name>           Team name (required if multiple teams)
  -l, --limit <number>    Max messages to fetch (default: 50)
  -s, --since <duration>  Time range: "24h", "7d", "30d" (default: 7d)

Search:
  search <query>          Search messages (supports Mattermost search modifiers)
  --team <name>           Team name (required if multiple teams)
  -l, --limit <number>    Max results (default: 50)

Mentions:
  mentions                Find @username + configured alias mentions
  --team <name>           Team name (required if multiple teams)
  -l, --limit <number>    Max results (default: 50)
  -s, --since <duration>  Time range filter (e.g. 24h, 7d)
  --channel <name>        Restrict mentions to one channel

Unread:
  unread                  Show channels with unread messages
  --team <name>           Team name (required if multiple teams)
  --peek <number>         Fetch N recent unread messages per channel

Watch:
  watch [channel]         Live tail a channel (Ctrl+C to stop)
  --team <name>           Team name (required if multiple teams)
  --dm <username>         Watch a DM conversation instead of a channel

Thread:
  thread <postId>         Fetch and display one thread

Security

This tool automatically detects and redacts secrets in message content:

• AWS access keys and secret keys
• GitHub/GitLab tokens
• Slack/Discord tokens and webhooks
• JWTs
• Connection strings (postgres://, mongodb://, etc.)
• API keys, passwords, and more

Secrets are partially masked (e.g., ghp_...cret) to preserve context while preventing exposure.

Note: Redaction happens on display. Original messages are not modified on the server.

AI Agent Skill

This repo ships an agent skill for the Vercel Skills CLI. Install it to give your AI coding agent access to Mattermost:

bunx skills@latest add ardasevinc/mattermost-cli --skill mattermost-cli

Contributing

Development requires Bun (the published package works with any runtime).

bun install     # Install dependencies
bun run lint    # Biome lint
bun run check   # Biome full check
bun x tsc --noEmit  # Typecheck
bun test        # Run tests
bun run build   # Build for npm
bun run mm      # Run CLI from source

License

MIT