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Mattermost

Mattermost

Self-hosted Slack alternative — read and post from an AI agent.

Score 55(?)Community (conarti)Apache-2.02Verified Top MCPs for Communication →
InstallView on GitHub

Quick answer

What it does

Connects to a Mattermost server and exposes channel + team enumeration, message posting and reading, and reaction/thread support.

Best for

  • Self-hosted chat automation
  • Data-residency-constrained agent flows
  • Channel summarisation
  • Bot-style replies

Not for

  • Teams on Slack or MS Teams
  • High-throughput marketing flows

Setup recipe

Pick your client, then follow the three steps.

  1. 1

    Install

    claude_desktop_config.json
    {
  "mcpServers": {
    "mattermost": {
      "command": "npx",
      "args": [
        "-y",
        "@conarti/mattermost-mcp"
      ],
      "env": {
        "MATTERMOST_URL": "${MATTERMOST_URL}",
        "MATTERMOST_TOKEN": "${MATTERMOST_TOKEN}"
      }
    }
  }
}

    Paste under mcpServers. Fully quit and reopen Claude after editing.

    CLI or .mcp.json
    # export MATTERMOST_URL=https://chat.example.com
# export MATTERMOST_TOKEN=your-personal-access-token
claude mcp add mattermost -- npx -y @conarti/mattermost-mcp

    Run from your repo. Commit .mcp.json to share with your team.

    .cursor/mcp.json
    {
  "mcpServers": {
    "mattermost": {
      "command": "npx",
      "args": [
        "-y",
        "@conarti/mattermost-mcp"
      ],
      "env": {
        "MATTERMOST_URL": "${MATTERMOST_URL}",
        "MATTERMOST_TOKEN": "${MATTERMOST_TOKEN}"
      }
    }
  }
}

    Global path: ~/.cursor/mcp.json. Reload window after editing.

    .vscode/mcp.json
    {
  "servers": {
    "mattermost": {
      "command": "npx",
      "args": [
        "-y",
        "@conarti/mattermost-mcp"
      ],
      "env": {
        "MATTERMOST_URL": "${MATTERMOST_URL}",
        "MATTERMOST_TOKEN": "${MATTERMOST_TOKEN}"
      }
    }
  }
}

    VS Code uses the "servers" key (not "mcpServers").

    ~/.codeium/windsurf/mcp_config.json
    {
  "mcpServers": {
    "mattermost": {
      "command": "npx",
      "args": [
        "-y",
        "@conarti/mattermost-mcp"
      ],
      "env": {
        "MATTERMOST_URL": "${MATTERMOST_URL}",
        "MATTERMOST_TOKEN": "${MATTERMOST_TOKEN}"
      }
    }
  }
}

    Open via Cascade → hammer icon → Configure.

    cline_mcp_settings.json
    {
  "mcpServers": {
    "mattermost": {
      "command": "npx",
      "args": [
        "-y",
        "@conarti/mattermost-mcp"
      ],
      "env": {
        "MATTERMOST_URL": "${MATTERMOST_URL}",
        "MATTERMOST_TOKEN": "${MATTERMOST_TOKEN}"
      }
    }
  }
}

    Open via the Cline sidebar → MCP Servers → Edit.

    ~/.continue/config.json
    {
  "experimental": {
    "modelContextProtocolServers": [
      {
        "transport": {
          "type": "stdio",
          "command": "npx",
          "args": [
            "-y",
            "@conarti/mattermost-mcp"
          ],
          "env": {
            "MATTERMOST_URL": "${MATTERMOST_URL}",
            "MATTERMOST_TOKEN": "${MATTERMOST_TOKEN}"
          }
        }
      }
    ]
  }
}

    Continue uses modelContextProtocolServers with a transport block.

    ~/.codex/config.toml
    # ~/.codex/config.toml
[mcp_servers.mattermost]
command = "npx"
args = [
  "-y",
  "@conarti/mattermost-mcp",
]
env = { MATTERMOST_URL = "${MATTERMOST_URL}", MATTERMOST_TOKEN = "${MATTERMOST_TOKEN}" }

    Codex uses TOML. Each server is a [mcp_servers.<name>] subtable.

    ~/.config/zed/settings.json
    {
  "context_servers": {
    "mattermost": {
      "command": {
        "path": "npx",
        "args": [
          "-y",
          "@conarti/mattermost-mcp"
        ]
      },
      "env": {
        "MATTERMOST_URL": "${MATTERMOST_URL}",
        "MATTERMOST_TOKEN": "${MATTERMOST_TOKEN}"
      }
    }
  }
}

    Zed calls them "context_servers". Settings live-reload on save.

    ChatGPT → Apps directory

    Mattermost doesn't ship a hosted HTTPS endpoint today. ChatGPT supports remote MCP servers only — to use this server in ChatGPT you'll need to deploy it to a public HTTPS URL first (e.g. via Cloudflare Workers or Vercel) or wait for an official remote build.

  2. 2

    Set required secrets

    Set MATTERMOST_URL, MATTERMOST_TOKEN in your shell environment before launching your MCP client.

  3. 3

    Try a minimum working prompt

    Minimum working prompt pending verification. Try any prompt from the MCP’s README once installed.

Tools & permissions

Tools list pending verification. The server exposes tools over MCP; we haven’t yet parsed its capability manifest into this page. Check the GitHub repo for the authoritative list.

Security & scope

Access scope
Network
Sandbox
Personal access token or bot token in env. Token inherits the issuing identity's permissions; use a dedicated bot account scoped to only the channels the agent should access.
Gotchas
  • Personal access tokens carry the issuing user's permissions — a privileged user's token is dangerous in agent loops.
  • Mattermost admins can disable PAT issuance — coordinate with admin before relying on it.
  • Self-hosted instances may use self-signed TLS certs; the MCP rejects them by default. Configure trust explicitly.

Agent prompt pack

— copy into Claude, Cursor, or ChatGPT.
Paste into Claude, Cursor, or ChatGPT. Edit the [brackets] before sending.
Recommend the best MCP servers for [task: e.g. communication work] in [client: Claude].

Constraints:
- Prefer tools that are [official | open-source | read-only] — pick what matters for my use case.
- Exclude MCPs that require [e.g. a paid plan, OAuth-only flows, remote-only transport].
- Return at most 3 picks, ranked.

For each pick include:
1. One-sentence rationale.
2. The ready-to-paste install snippet for my client.
3. Any required secrets I need to create before installing.

Cross-check the top-mcps.com listing: https://top-mcps.com/top-mcps-for-communication
Compare Mattermost against a real alternative. Swap the second MCP in [brackets] if you want a different match.
Compare Mattermost MCP vs [Slack MCP] for the following job: [describe the job, e.g. "let an agent create GitHub issues on bug triage"].

Judge them on:
- Setup time and complexity (what a new user hits first).
- Auth model (none / API key / OAuth 2.1) and credential risk.
- Transport (stdio / Streamable HTTP / SSE) and where the server runs.
- Required secrets and the blast radius if they leak.
- Operational risk in an unattended agent loop.
- Which one is "good enough" for a weekend prototype vs. production.

End with one sentence: which should I pick for my scenario, which is: [my scenario].

References:
- https://top-mcps.com/mcp/mattermost
- top-mcps.com listing for Slack
Asks the agent to install and verify. Works inside Claude Code, Cursor Agent, Codex CLI.
Install the Mattermost MCP server for my [client: Claude] at the default config path for that client.

Use the exact install snippet published at https://top-mcps.com/mcp/mattermost (fetch https://top-mcps.com/mcp/mattermost.json for the canonical server.json if you can read URLs).

Before finishing:
1. Create the required secrets (MATTERMOST_URL, MATTERMOST_TOKEN) and put them in the appropriate env block — do not hard-code them.
2. Restart or reload the client so it picks up the new server.
3. Verify the server is connected (green / running state) and at least one tool is listed.
4. If anything fails, read the client's MCP logs and report the exact error — do not silently retry.

Confirm when done and list the tools the server now exposes.

Frequently asked questions

What changed

— 2 updates tracked.

  1. Refreshed install snippets and fact sheet; verified for 2026.

  2. Initial directory listing.

More Communication MCPs

Other tools in the same category worth evaluating.

Slack logo — MCP server

Read and send Slack messages, manage channels and threads.

slack, messaging, communication, automation
10 minMedium
Discord

Read and post to Discord channels — community management for AI agents.

discord, chat, community, bot
10 minMedium
Telegram

Send messages and read channel history from a Telegram bot in an agent.

communication, messaging, telegram, bot
6 minLow

Compared with Mattermost

Side-by-side breakdowns for the choices people most often weigh against this MCP.

MattermostvsTelegramMattermostvsSlackMattermostvsDiscordMattermostvsMicrosoft Teams

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