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mm-mcp for Mattermost

by vriesdemichaelversion 0.4.1i★ –iRuns on your computer
Registry nameio.github.vriesdemichael/mm-mcp

Install

Overview

Description from the maker (original English)

Read, search and post in Mattermost as yourself or a bot.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

  • Connection: Runs on your computer
  • Transport: stdio
  • Category: Search & AI memory
  • You need to fill in: MM_TOKEN, MM_URL

Install

Pick the AI app you use, then copy the settings.

Before you install

  • Basic checks: 1 of 1 passed
  • Runs on your computer with your user’s permissions (files, network, apps).
  • You fill in yourself: MM_MCP_ALLOW_WRITES, MM_MCP_CA_FILE, MM_MCP_DOWNLOAD_DIR, MM_MCP_ELICITATION_OPT_IN, MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE, MM_MCP_MARK_AI_GENERATED, MM_MCP_POST_FROM_VIEWS, MM_MCP_RESOURCE_MAX_MB, MM_TOKEN, MM_URL

Values marked secret are keys to your account. Never share them or paste them into a chat.

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Download the maker’s .mcpb file

The link goes to the maker’s own file; we do not host or repackage it. Open the file and Claude Desktop installs it.

Run this in your terminal

Fill in the empty values before running it.

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

  • MM_MCP_ALLOW_WRITES env
    Offer the tools that post and change things. Your client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts.
  • MM_MCP_CA_FILE env
    A PEM file of certificate authorities to trust beside your system's, for a Mattermost whose certificate your organisation signed itself. Leave it empty otherwise.
  • MM_MCP_DOWNLOAD_DIR env
    Where save_file writes attachments. Leave it empty for your Downloads directory.
  • MM_MCP_ELICITATION_OPT_IN env
    Your client's own approval of each call decides whether a post or another change others see goes ahead, and mm-mcp checks what each states. Turn this on to have mm-mcp ask you too, through a question…
  • MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE env
    Not with mm-mcp asks as well: marks each tool that changes what others see so that Claude Code asks a person on every call, whatever its permission mode or rules allow. An agent cannot post on its ow…
  • MM_MCP_MARK_AI_GENERATED env
    Mark every post and edit the model writes with Mattermost's own marker for text written with AI.
  • MM_MCP_POST_FROM_VIEWS env
    Where your app shows mm-mcp's views, a post the model proposes as your draft can be posted from the view with Post. Off, the draft waits in Mattermost for you to send.
  • MM_MCP_RESOURCE_MAX_MB env
    The most one message carrying an attached file as an MCP resource holds, a binary file counted as its base64. MCP sends a resource whole, and a client drops a message past its own limit, 10 MB for cl…
  • MM_TOKEN secret env
    A personal access token or a bot token. Where those are switched off, leave it empty after logging in once with mm-mcp login --url in a terminal, which keeps your session in the system's credential s…
  • MM_URL required env
    The address you open Mattermost at, such as https://chat.example.com.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified with the GitHub account vriesdemichael, which owns the repo

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • – Not applicable

    Endpoint responds

    This one runs on your computer; there is no internet endpoint

  • – Not applicable

    Sign-in with OAuth

    Runs on your computer and uses local settings instead

  • … Not checked yet

    No hidden instructions in tool descriptions

    Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Search & AI memoryi

  • More stars than 0% of the other 5653 servers in this category
  • Published to the registry more recently than 83% of the other 5653 servers in this category
  • Basic checks equal to or better than 100% of the other 5653 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is mm-mcp for Mattermost safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: MM_TOKEN, MM_URL

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.4.1) reached the registry 8 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need MCPB on your computer.

What can I use instead?

In the same category: Context7, Codebase Memory, Exa

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Context7

by upstash

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

Computer or cloud★ 64,224MITUpdated yesterday
Install

Codebase Memory

by DeusData

Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.

Runs on your computer★ 48,148MITUpdated 21 days ago
Install

Exa

by exa-labs

Connect AI agents to Exa for web search, content fetching, and multi-step research.

Runs in the cloud★ 5,213MITUpdated 2 months ago
Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

mm-mcp

An MCP server for Mattermost. It lets an AI agent read and search your Mattermost and, when you allow it, post and reply, as you or as a bot.

mm-mcp is an independent project. It is not affiliated with, endorsed by or supported by Mattermost, Inc.; Mattermost is a trademark of Mattermost, Inc.

The tools read channels, threads, unread posts, mentions and files, search posts, files, people and channels, and, once you allow writes, post, reply, edit, react, pin, propose posts, join, leave and create channels, and set your status. A link pasted from Mattermost works wherever a tool that reads wants an id, every answer links each post, channel and team it names and gives the address a write others see takes, and attached files, their previews, profile pictures and custom emoji are MCP resources your client can read too. The tools page lists every tool. In a client that renders MCP Apps views, a thread, what is unread for you, or a post your agent made or proposes can be shown in the chat as Mattermost lays it out; more views are planned, and the issues are the plan.

A reply your agent drafted, waiting for you to post, change or discard, and a thread you asked to see, as an AI app that shows views shows them (try them live):

Why it works the way it does

  • Read-only unless you say otherwise. The tools that post or change anything are not offered until MM_MCP_ALLOW_WRITES is true. Then your MCP client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts: how many people a post or an edit reaches and a post notifies, the text an edit replaces, what a deletion takes away, and where it goes, by address. By default, every post and edit is marked as written with AI. MM_MCP_ELICITATION_OPT_IN=true has mm-mcp ask you as well, in a client that shows its question.
  • Your token, a bot's, or your own login. A personal access token, a bot token, or your own login through mm-mcp login, single sign-on included, kept in your system's credential store, for servers where personal access tokens are switched off.
  • Mattermost's own client. Requests and answers use the server's own Go client and types, not a hand-written description of the API.
  • Every supported release, tested. Every tool runs against a real Mattermost Team Edition, on the Extended Support Release and the newest release on every change, and on every release between them each week.
  • stdio and Streamable HTTP. A client starts it as a local process, or it serves Streamable HTTP on a loopback address.

Quick start

Install mm-mcp with brew install vriesdemichael/tap/mm-mcp, winget install vriesdemichael.mm-mcp or scoop install vriesdemichael/mm-mcp (after scoop bucket add vriesdemichael https://github.com/vriesdemichael/scoop), or download the binary for your machine from the latest release. Then get a personal access token in Mattermost under Profile → Security → Personal Access Tokens, and keep it in your system's credential store, out of your client's configuration, with mm-mcp login --with paste --url https://chat.example.com. Where those tokens are switched off, log in once with mm-mcp login --url https://chat.example.com instead.

{

"mcpServers": { "mattermost": { "command": "mm-mcp", "args": ["serve"], "env": { "MM_URL": "https://chat.example.com" } } } }

Or, for Claude Code, the plugin, which asks for the address and a token you can leave empty after mm-mcp login:

/plugin marketplace add vriesdemichael/mm-mcp

/plugin install mm-mcp@mm-mcp

or the server alone:

claude mcp add mattermost --scope user --env MM_URL=https://chat.example.com -- mm-mcp serve

Claude Desktop users can open the .mcpb bundle for their machine from the latest release instead.

When it does not work, mm-mcp doctor --url https://chat.example.com checks the configuration, the stored login, the way to the server and the credential, and says what to fix; from inside your MCP client, the diagnose tool does the same with the client's own configuration.

The documentation has every setting, the tools, and the supported Mattermost releases.

Contributing

See CONTRIBUTING.md. The decisions behind how this project is built are in docs/site/adr.

License

Apache-2.0

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