Mattermost MCP Setup & Guide

{
  "id": "io.github.vriesdemichael/mm-mcp",
  "type": "mcp-server",
  "version": "0.3.1",
  "displayName": "Mattermost",
  "description": "Read, search and post in Mattermost as yourself or a bot.",
  "repository": {
    "url": "https://github.com/vriesdemichael/mm-mcp",
    "source": "github"
  },
  "distribution": {
    "packages": [
      {
        "registryType": "mcpb",
        "identifier": "https://github.com/vriesdemichael/mm-mcp/releases/download/v0.3.1/mm-mcp_0.3.1_darwin_amd64.mcpb",
        "version": "0.3.1",
        "transport": "stdio",
        "environmentVariables": [
          {
            "name": "MM_MCP_ALLOW_WRITES",
            "description": "Offer the tools that post and change things. Each change others see asks you before it acts, which needs a client that shows MCP elicitation questions; following a thread, saving a post or a draft, reminders and typing do not ask."
          },
          {
            "name": "MM_MCP_ASK_BEFORE_WRITES",
            "description": "mm-mcp asks you before each change others see. Turn it off only where your client does not show mm-mcp's question, and its own approval of each tool call is to be the check instead: a client that approves tools by itself then posts as you with nobody seeing it first."
          },
          {
            "name": "MM_MCP_CA_FILE",
            "description": "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."
          },
          {
            "name": "MM_MCP_DOWNLOAD_DIR",
            "description": "Where save_file writes attachments. Leave it empty for your Downloads directory."
          },
          {
            "name": "MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE",
            "description": "Only with Ask before posting off: 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 own while it is on."
          },
          {
            "name": "MM_MCP_MARK_AI_GENERATED",
            "description": "Mark every post and edit the model writes with Mattermost's own marker for text written with AI."
          },
          {
            "name": "MM_MCP_RESOURCE_MAX_MB",
            "description": "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 clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit."
          },
          {
            "name": "MM_TOKEN",
            "description": "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 <address> in a terminal, which keeps your session in the system's credential store.",
            "isSecret": true
          },
          {
            "name": "MM_URL",
            "description": "The address you open Mattermost at, such as https://chat.example.com.",
            "isRequired": true
          }
        ]
      },
      {
        "registryType": "mcpb",
        "identifier": "https://github.com/vriesdemichael/mm-mcp/releases/download/v0.3.1/mm-mcp_0.3.1_darwin_arm64.mcpb",
        "version": "0.3.1",
        "transport": "stdio",
        "environmentVariables": [
          {
            "name": "MM_MCP_ALLOW_WRITES",
            "description": "Offer the tools that post and change things. Each change others see asks you before it acts, which needs a client that shows MCP elicitation questions; following a thread, saving a post or a draft, reminders and typing do not ask."
          },
          {
            "name": "MM_MCP_ASK_BEFORE_WRITES",
            "description": "mm-mcp asks you before each change others see. Turn it off only where your client does not show mm-mcp's question, and its own approval of each tool call is to be the check instead: a client that approves tools by itself then posts as you with nobody seeing it first."
          },
          {
            "name": "MM_MCP_CA_FILE",
            "description": "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."
          },
          {
            "name": "MM_MCP_DOWNLOAD_DIR",
            "description": "Where save_file writes attachments. Leave it empty for your Downloads directory."
          },
          {
            "name": "MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE",
            "description": "Only with Ask before posting off: 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 own while it is on."
          },
          {
            "name": "MM_MCP_MARK_AI_GENERATED",
            "description": "Mark every post and edit the model writes with Mattermost's own marker for text written with AI."
          },
          {
            "name": "MM_MCP_RESOURCE_MAX_MB",
            "description": "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 clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit."
          },
          {
            "name": "MM_TOKEN",
            "description": "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 <address> in a terminal, which keeps your session in the system's credential store.",
            "isSecret": true
          },
          {
            "name": "MM_URL",
            "description": "The address you open Mattermost at, such as https://chat.example.com.",
            "isRequired": true
          }
        ]
      },
      {
        "registryType": "mcpb",
        "identifier": "https://github.com/vriesdemichael/mm-mcp/releases/download/v0.3.1/mm-mcp_0.3.1_linux_amd64.mcpb",
        "version": "0.3.1",
        "transport": "stdio",
        "environmentVariables": [
          {
            "name": "MM_MCP_ALLOW_WRITES",
            "description": "Offer the tools that post and change things. Each change others see asks you before it acts, which needs a client that shows MCP elicitation questions; following a thread, saving a post or a draft, reminders and typing do not ask."
          },
          {
            "name": "MM_MCP_ASK_BEFORE_WRITES",
            "description": "mm-mcp asks you before each change others see. Turn it off only where your client does not show mm-mcp's question, and its own approval of each tool call is to be the check instead: a client that approves tools by itself then posts as you with nobody seeing it first."
          },
          {
            "name": "MM_MCP_CA_FILE",
            "description": "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."
          },
          {
            "name": "MM_MCP_DOWNLOAD_DIR",
            "description": "Where save_file writes attachments. Leave it empty for your Downloads directory."
          },
          {
            "name": "MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE",
            "description": "Only with Ask before posting off: 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 own while it is on."
          },
          {
            "name": "MM_MCP_MARK_AI_GENERATED",
            "description": "Mark every post and edit the model writes with Mattermost's own marker for text written with AI."
          },
          {
            "name": "MM_MCP_RESOURCE_MAX_MB",
            "description": "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 clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit."
          },
          {
            "name": "MM_TOKEN",
            "description": "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 <address> in a terminal, which keeps your session in the system's credential store.",
            "isSecret": true
          },
          {
            "name": "MM_URL",
            "description": "The address you open Mattermost at, such as https://chat.example.com.",
            "isRequired": true
          }
        ]
      },
      {
        "registryType": "mcpb",
        "identifier": "https://github.com/vriesdemichael/mm-mcp/releases/download/v0.3.1/mm-mcp_0.3.1_linux_arm64.mcpb",
        "version": "0.3.1",
        "transport": "stdio",
        "environmentVariables": [
          {
            "name": "MM_MCP_ALLOW_WRITES",
            "description": "Offer the tools that post and change things. Each change others see asks you before it acts, which needs a client that shows MCP elicitation questions; following a thread, saving a post or a draft, reminders and typing do not ask."
          },
          {
            "name": "MM_MCP_ASK_BEFORE_WRITES",
            "description": "mm-mcp asks you before each change others see. Turn it off only where your client does not show mm-mcp's question, and its own approval of each tool call is to be the check instead: a client that approves tools by itself then posts as you with nobody seeing it first."
          },
          {
            "name": "MM_MCP_CA_FILE",
            "description": "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."
          },
          {
            "name": "MM_MCP_DOWNLOAD_DIR",
            "description": "Where save_file writes attachments. Leave it empty for your Downloads directory."
          },
          {
            "name": "MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE",
            "description": "Only with Ask before posting off: 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 own while it is on."
          },
          {
            "name": "MM_MCP_MARK_AI_GENERATED",
            "description": "Mark every post and edit the model writes with Mattermost's own marker for text written with AI."
          },
          {
            "name": "MM_MCP_RESOURCE_MAX_MB",
            "description": "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 clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit."
          },
          {
            "name": "MM_TOKEN",
            "description": "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 <address> in a terminal, which keeps your session in the system's credential store.",
            "isSecret": true
          },
          {
            "name": "MM_URL",
            "description": "The address you open Mattermost at, such as https://chat.example.com.",
            "isRequired": true
          }
        ]
      },
      {
        "registryType": "mcpb",
        "identifier": "https://github.com/vriesdemichael/mm-mcp/releases/download/v0.3.1/mm-mcp_0.3.1_windows_amd64.mcpb",
        "version": "0.3.1",
        "transport": "stdio",
        "environmentVariables": [
          {
            "name": "MM_MCP_ALLOW_WRITES",
            "description": "Offer the tools that post and change things. Each change others see asks you before it acts, which needs a client that shows MCP elicitation questions; following a thread, saving a post or a draft, reminders and typing do not ask."
          },
          {
            "name": "MM_MCP_ASK_BEFORE_WRITES",
            "description": "mm-mcp asks you before each change others see. Turn it off only where your client does not show mm-mcp's question, and its own approval of each tool call is to be the check instead: a client that approves tools by itself then posts as you with nobody seeing it first."
          },
          {
            "name": "MM_MCP_CA_FILE",
            "description": "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."
          },
          {
            "name": "MM_MCP_DOWNLOAD_DIR",
            "description": "Where save_file writes attachments. Leave it empty for your Downloads directory."
          },
          {
            "name": "MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE",
            "description": "Only with Ask before posting off: 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 own while it is on."
          },
          {
            "name": "MM_MCP_MARK_AI_GENERATED",
            "description": "Mark every post and edit the model writes with Mattermost's own marker for text written with AI."
          },
          {
            "name": "MM_MCP_RESOURCE_MAX_MB",
            "description": "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 clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit."
          },
          {
            "name": "MM_TOKEN",
            "description": "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 <address> in a terminal, which keeps your session in the system's credential store.",
            "isSecret": true
          },
          {
            "name": "MM_URL",
            "description": "The address you open Mattermost at, such as https://chat.example.com.",
            "isRequired": true
          }
        ]
      },
      {
        "registryType": "mcpb",
        "identifier": "https://github.com/vriesdemichael/mm-mcp/releases/download/v0.3.1/mm-mcp_0.3.1_windows_arm64.mcpb",
        "version": "0.3.1",
        "transport": "stdio",
        "environmentVariables": [
          {
            "name": "MM_MCP_ALLOW_WRITES",
            "description": "Offer the tools that post and change things. Each change others see asks you before it acts, which needs a client that shows MCP elicitation questions; following a thread, saving a post or a draft, reminders and typing do not ask."
          },
          {
            "name": "MM_MCP_ASK_BEFORE_WRITES",
            "description": "mm-mcp asks you before each change others see. Turn it off only where your client does not show mm-mcp's question, and its own approval of each tool call is to be the check instead: a client that approves tools by itself then posts as you with nobody seeing it first."
          },
          {
            "name": "MM_MCP_CA_FILE",
            "description": "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."
          },
          {
            "name": "MM_MCP_DOWNLOAD_DIR",
            "description": "Where save_file writes attachments. Leave it empty for your Downloads directory."
          },
          {
            "name": "MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODE",
            "description": "Only with Ask before posting off: 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 own while it is on."
          },
          {
            "name": "MM_MCP_MARK_AI_GENERATED",
            "description": "Mark every post and edit the model writes with Mattermost's own marker for text written with AI."
          },
          {
            "name": "MM_MCP_RESOURCE_MAX_MB",
            "description": "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 clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit."
          },
          {
            "name": "MM_TOKEN",
            "description": "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 <address> in a terminal, which keeps your session in the system's credential store.",
            "isSecret": true
          },
          {
            "name": "MM_URL",
            "description": "The address you open Mattermost at, such as https://chat.example.com.",
            "isRequired": true
          }
        ]
      }
    ],
    "remotes": []
  },
  "dependencies": [],
  "installTargets": [
    "claude-code",
    "claude-desktop",
    "cursor",
    "vscode",
    "trae",
    "cherry-studio",
    "lingma",
    "windsurf",
    "cline",
    "workbuddy"
  ],
  "keywords": [],
  "provenance": {
    "origin": "official-mcp-registry",
    "originalId": "io.github.vriesdemichael/mm-mcp",
    "originalUrl": "https://registry.modelcontextprotocol.io/v0.1/servers/io.github.vriesdemichael%2Fmm-mcp/versions/latest",
    "isOfficial": true,
    "status": "active"
  }
}