Mattermost runs on your own machine — the client starts it, so there is no endpoint to ping. 568 installs a week from pypi. Last commit 2 Nov 2026.
Mattermost: read unreads, mentions, channels and threads; opt-in posting, edits, reactions
What the code does
We read the source, 5 d ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
result = subprocess.run(
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mattermost-mcp -e 'MATTERMOST_URL=<MATTERMOST_URL>' -- uvx mattermost-mcp-server{
"mcpServers": {
"mattermost-mcp": {
"command": "uvx",
"args": [
"mattermost-mcp-server"
],
"env": {
"MATTERMOST_URL": "<MATTERMOST_URL>"
}
}
}
}[mcp_servers.mattermost-mcp]
command = "uvx"
args = ["mattermost-mcp-server"]
env = { MATTERMOST_URL = "<MATTERMOST_URL>" }{
"mcpServers": {
"mattermost-mcp": {
"command": "uvx",
"args": [
"mattermost-mcp-server"
],
"env": {
"MATTERMOST_URL": "<MATTERMOST_URL>"
}
}
}
}{
"servers": {
"mattermost-mcp": {
"type": "stdio",
"command": "uvx",
"args": [
"mattermost-mcp-server"
],
"env": {
"MATTERMOST_URL": "<MATTERMOST_URL>"
}
}
}
}Put your own value in place of
<MATTERMOST_URL> (Base URL of your Mattermost server, e.g. https://mattermost.example.com).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
MATTERMOST_ACCESS_TOKEN (Personal access token or bot token (Profile > Security > Personal Access Tokens)), MATTERMOST_ENABLE_WRITE (Set to 1 to enable posting, replying, editing own posts and reactions (off by default)), MATTERMOST_TOKEN (Cookie mode: value of the MMAUTHTOKEN browser cookie (when personal access tokens are unavailable)), MATTERMOST_CSRF (Cookie mode: value of the MMCSRF browser cookie (required for write tools in cookie mode)).
Alternatives to Mattermost
same job, measured the same waySlack channels, messages, threads, reactions and users via the Slack Web API.
Read and post in Solfray channels and threads, a Solana community chat with 0% fee SOL tipping.
Query channels, search messages, and read threads, users and reactions in your Stream Chat app.
Slack MCP server: channels, messages, threads, reactions, users, files, and scheduled messages
Live Reddit and X (Twitter) data: search, threads, users, subreddits, leads and mentions.
Read and edit the project open in ZennoPoster ProjectMaker, run it and record actions.
Discord guild and channel messaging via REST API v10: guilds, channels, messages and reactions.
Read-only Piazza access: activity, search, unread posts, full threads, and course info
Mattermost — questions
Answers built from our own checks of this server.