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Reddit MCP Integration for LangGraph

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

9 functions 7 read 2 write Manual OAuth token auth
Submit Reddit feedback View package source

Connect Reddit 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.

Reddit MCP Config for LangGraph

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Reddit 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.

Reddit Tools Visible to LangGraph

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

MCP toolSource functionTypeDescription
integration__reddit__reddit_create_comment reddit.reddit_create_comment Write Post a comment on a Reddit post or reply to an existing comment. The comment body supports Markdown formatting. Use "t3_" prefix for post IDs or "t1_" prefix for comment IDs as the parent.
integration__reddit__reddit_create_post reddit.reddit_create_post Write Submit a new post to a subreddit. Supports text (self), link, image, and video post types.
integration__reddit__reddit_get_current_user reddit.reddit_get_current_user Read Get the profile of the currently authenticated Reddit user. Useful for verifying credentials and displaying account information.
integration__reddit__reddit_get_post reddit.reddit_get_post Read Get details for a specific Reddit post by subreddit and post ID. Returns the post listing and its top-level comments.
integration__reddit__reddit_get_subreddit reddit.reddit_get_subreddit Read Get information about a specific subreddit including subscriber count, description, and settings.
integration__reddit__reddit_list_comments reddit.reddit_list_comments Read List comments for a specific Reddit post. Supports sorting (best, top, new, controversial, old, q&a) and depth limiting.
integration__reddit__reddit_list_posts reddit.reddit_list_posts Read List posts from a subreddit or the Reddit front page. Supports hot, new, top, rising, and controversial sorting with pagination via after/before cursors.
integration__reddit__reddit_list_subreddits reddit.reddit_list_subreddits Read List popular or new subreddits. Supports pagination with after/before cursors.
integration__reddit__reddit_search reddit.reddit_search Read Search Reddit for posts, subreddits, or users. Supports filtering by type, sorting, and time range. Use this to find relevant content across Reddit.

Related Reddit Pages

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