KosmoKrator

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Mattermost MCP Integration for LangGraph

Connect Mattermost to LangGraph through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

7 functions 6 read 1 write Bearer token auth
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Connect Mattermost to LangGraph

Run KosmoKrator integration calls from LangGraph nodes while preserving local credentials and permissions.

Use a graph node that calls the KosmoKrator CLI for deterministic steps or an MCP client for dynamic tool selection. The gateway is local, scoped to this integration, and starts with --write=deny so LangGraph can inspect read-capable tools without receiving write access by default.

Mattermost MCP Config for LangGraph

Headless CLI calls fit repeatable graph edges; MCP fits exploratory agent nodes.

{
  "mcpServers": {
    "kosmokrator-mattermost": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=mattermost",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=mattermost --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Mattermost instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Mattermost Tools Visible to LangGraph

LangGraph sees stable MCP tool names generated from the Mattermost integration catalog.

MCP toolSource functionTypeDescription
integration__mattermost__mattermost_list_channels mattermost.mattermost_list_channels Read List channels the current user belongs to in Mattermost. Returns channel IDs, names, types, and team associations. Use this to discover available channels before posting messages or reading posts.
integration__mattermost__mattermost_get_channel mattermost.mattermost_get_channel Read Get details of a specific Mattermost channel by ID. Returns channel name, display name, type, header, purpose, and member counts.
integration__mattermost__mattermost_create_post mattermost.mattermost_create_post Write Post a message to a Mattermost channel. Provide the channel_id and the message text. Returns the created post with its ID and timestamp.
integration__mattermost__mattermost_list_posts mattermost.mattermost_list_posts Read List posts in a Mattermost channel. Returns post IDs, messages, author info, and timestamps. Use page and per_page for pagination.
integration__mattermost__mattermost_get_post mattermost.mattermost_get_post Read Get a specific Mattermost post by ID. Returns the full post including message content, author, channel, and timestamps.
integration__mattermost__mattermost_list_teams mattermost.mattermost_list_teams Read List teams the current user belongs to in Mattermost. Returns team IDs, names, display names, and types. Use this to discover available teams before working with channels.
integration__mattermost__mattermost_get_current_user mattermost.mattermost_get_current_user Read Get the profile of the currently authenticated Mattermost user. Returns username, email, display name, roles, and locale.

Related Mattermost Pages

Mattermost CLIUse direct JSON commands instead of MCP discovery. Mattermost MCPFull gateway reference and MCP tool names. KosmoKrator for LangGraphClient-level gateway setup.