# Reddit MCP Buddy ### Reddit Browser for Claude Desktop and AI Assistants A [Model Context Protocol (MCP)](https://modelcontextprotocol.io) server that enables Claude Desktop and other AI assistants to browse Reddit, search posts, and analyze user activity. Clean, fast, and actually works - browse subreddits with no API keys; add free Reddit credentials for search, comments, user analysis, and full metrics. [![npm version](https://img.shields.io/npm/v/reddit-mcp-buddy.svg)](https://www.npmjs.com/package/reddit-mcp-buddy) [![npm downloads](https://img.shields.io/npm/dm/reddit-mcp-buddy.svg)](https://www.npmjs.com/package/reddit-mcp-buddy) [![GitHub stars](https://img.shields.io/github/stars/karanb192/reddit-mcp-buddy.svg?style=flat&logo=github&color=brightgreen)](https://github.com/karanb192/reddit-mcp-buddy/stargazers) [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT) ## 🎬 See It In Action ![Reddit MCP Buddy Demo - AirPods Max 2 and Dune Part Three](assets/images/reddit-mcp-buddy-demo-2026.gif) *Claude checking Reddit's reaction to the Dune Part Three trailer and whether the AirPods Max 2 are worth $549* ![Reddit MCP Buddy Demo - Analyzing H1B sentiment across subreddits](assets/images/reddit-mcp-buddy.gif) *Claude analyzing real-time sentiment about H-1B visa changes across r/cscareerquestions and r/india* ## Table of Contents - [What makes Reddit MCP Buddy different?](#what-makes-reddit-mcp-buddy-different) - [Quick Start](#quick-start-30-seconds) - [What can it do?](#what-can-it-do) - [Available Tools](#available-tools) - [Authentication](#authentication-optional) - [Installation Options](#installation-options) - [Global Install](#global-install) - [From Source](#from-source) - [Using Docker](#using-docker) - [Claude Desktop Extension](#claude-desktop-extension) - [Comparison with Other Tools](#comparison-with-other-tools) - [Troubleshooting](#troubleshooting) - [Development](#development) - [Support](#support) - [Related Resources](#-related-resources) ## What makes Reddit MCP Buddy different? - **🚀 Zero setup** - Browse subreddits instantly, no Reddit API registration needed (search, comments, user analysis, and engagement metrics need free credentials) - **⚡ Up to 10x more requests** - Three-tier authentication system (10/60/100 requests per minute) - **🎯 Clean data** - No fake "sentiment analysis" or made-up metrics - **🧠 LLM-optimized** - Built specifically for AI assistants like Claude - **📦 TypeScript** - Fully typed, reliable, and maintainable - **✅ Proven rate limits** - Thoroughly tested authentication tiers with verification tools ## Quick Start (30 seconds) ### For Claude Desktop - Desktop Extension (Easiest!) 1. **Download**: [reddit-mcp-buddy.mcpb](https://github.com/karanb192/reddit-mcp-buddy/releases/latest/download/reddit-mcp-buddy.mcpb) 2. **Install**: Open the downloaded file 3. **Done!** Reddit tools are now available in Claude ### For Claude Desktop - NPM Method (Alternative) Add this to your `claude_desktop_config.json`: ```json { "mcpServers": { "reddit": { "command": "npx", "args": ["-y", "reddit-mcp-buddy"] } } } ``` ### For Claude Code Run this command to add the MCP server (user scope): ```bash claude mcp add --transport stdio reddit-mcp-buddy -s user -- npx -y reddit-mcp-buddy ``` ### For Other MCP Clients Use the NPM method: `npx -y reddit-mcp-buddy` ## What can it do? Ask your AI assistant to: - 📊 **"What's trending on Reddit?"** - Browse hot posts from r/all - 🔍 **"Search for discussions about AI"** - Search across all subreddits - 💬 **"Get comments from this Reddit post"** - Fetch post with full comment threads - 👤 **"Analyze user spez"** - Get user history, karma, and activity - 📚 **"Explain Reddit karma"** - Understand Reddit terminology ## Available Tools ### `browse_subreddit` Browse posts from any subreddit with sorting options. ``` - Subreddit: - "all" - entire Reddit frontpage - "popular" - trending across Reddit - Any specific subreddit (e.g., "technology", "programming", "science") - Sort by: hot, new, top, rising, controversial - Time range: hour, day, week, month, year, all (for top/controversial sort) - Include subreddit info: Optional flag for subreddit metadata (requires credentials) ``` > **No credentials?** Results are served from Reddit's public RSS feed (`data_source: "rss"`): `score`, `num_comments`, `upvote_ratio`, and `nsfw` come back `null`, and the `include_nsfw` filter can't be applied. Add credentials ([Authentication](#authentication-optional)) for full data via the API. ### `search_reddit` Search across Reddit or specific subreddits. ``` - Query: Your search terms - Filter by: subreddit, author, time, flair - Sort by: relevance, hot, top, new, comments ``` ### `get_post_details` Get a post with all its comments. ``` - Input: - Reddit URL (supports multiple formats), OR - Post ID alone (will auto-detect subreddit, 2 API calls), OR - Post ID + subreddit (most efficient, 1 API call) - Supported URL formats: - reddit.com, www.reddit.com - old.reddit.com, new.reddit.com - np.reddit.com (No Participation links) - m.reddit.com (mobile links) - redd.it short URLs - URLs with query params (?utm_source=...) or fragments (#comment) - Options: comment sorting, depth, link extraction ``` ### `user_analysis` Analyze a Reddit user's profile. ``` - Username: Any Reddit user - Returns: karma, posts, comments, active subreddits ``` ### `reddit_explain` Get explanations of Reddit terms. ``` - Terms: karma, cake day, AMA, ELI5, etc. ``` ## Authentication (Optional) Want more requests? Add Reddit credentials to your Claude Desktop config: ### Setup Steps 1. **Go to** https://www.reddit.com/prefs/apps 2. **Click** "Create App" or "Create Another App" 3. **Fill out the form:** - **Name**: Any name (e.g., "reddit-mcp-buddy") - **App type**: Select **"script"** (CRITICAL for 100 rpm!) - **Description**: Optional - **About URL**: Leave blank - **Redirect URI**: `http://localhost:8080` (required but unused) 4. **Click** "Create app" 5. **Find your credentials:** - **Client ID**: The string under "personal use script" - **Client Secret**: The secret string 6. **Update your Claude Desktop config:** ```json { "mcpServers": { "reddit": { "command": "npx", "args": ["-y", "reddit-mcp-buddy"], "env": { "REDDIT_CLIENT_ID": "your_client_id", "REDDIT_CLIENT_SECRET": "your_client_secret", "REDDIT_USERNAME": "your_username", "REDDIT_PASSWORD": "your_password" } } } } ``` ### Three-Tier Authentication System Reddit MCP Buddy supports three authentication levels, each with different rate limits: | Mode | Rate Limit | Required Credentials | Best For | |------|------------|---------------------|----------| | **Anonymous** | 10 req/min* | None | Testing, light usage | | **App-Only** | 60 req/min | Client ID + Secret | Regular browsing | | **Authenticated** | 100 req/min | All 4 credentials | Heavy usage, automation | *\*Server-side cap. Anonymous requests are served from Reddit's logged-out RSS feed, which applies its own stricter per-IP throttle (often one uncached request per 25-60 seconds). The 15-minute cache and automatic retries absorb much of this, but sustained anonymous browsing is effectively slower than 10 req/min.* #### How It Works: - **Anonymous Mode**: Default mode, no setup required. Only `browse_subreddit` (plus the offline `reddit_explain`) works: Reddit blocks the logged-out JSON API, so browse results come from Reddit's public RSS feed (`data_source: "rss"`) with engagement metrics and NSFW flags as `null`. The remaining tools require credentials. - **App-Only Mode**: Uses OAuth2 client credentials grant (works with both script and web apps) - **Authenticated Mode**: Uses OAuth2 password grant (requires script app type) **Important Notes**: - Script apps support BOTH app-only (60 rpm) and authenticated (100 rpm) modes - Web apps only support app-only mode (60 rpm maximum) - For 100 requests/minute, you MUST use a script app with username + password ## Privacy & Data Handling Reddit MCP Buddy is designed with privacy and transparency in mind. Here's how your data is handled: ### Data Collection - **Reddit API Data**: The server fetches public Reddit content (posts, comments, user profiles) through Reddit's official API - **No Tracking**: We don't collect, store, or transmit any analytics, telemetry, or usage data - **No Third Parties**: All data flows directly between your machine, Reddit's API, and your AI assistant ### Local Storage - **Authentication Credentials** (optional): - Stored locally in `~/.reddit-mcp-buddy/auth.json` when using `--auth` CLI setup - Passwords are **never** written to disk - only used in-memory for OAuth token exchange - Environment variables (recommended for Claude Desktop) are never persisted by this server - **Cache Data**: - Reddit API responses are temporarily cached in memory to improve performance - Cache size limited to 50MB maximum - All cache data is cleared when the server stops - Can be disabled with `REDDIT_BUDDY_NO_CACHE=true` ### Data Transmission - **Reddit API Only**: Your credentials are only sent to Reddit's official OAuth endpoints (`https://oauth.reddit.com` and `https://www.reddit.com`) - **No External Services**: No data is sent to any other external services, analytics platforms, or third parties - **Local Processing**: All data processing happens locally on your machine ### Security Notes - **Read-Only Operations**: All tools are read-only - the server never posts, comments, or modifies any Reddit content - **Credential Safety**: - OAuth tokens are refreshed automatically and kept in memory; only `--auth` CLI setups also cache the token in `~/.reddit-mcp-buddy/auth.json` (file mode 600) - Client secrets are treated as sensitive and never logged - Use environment variables in Claude Desktop config for maximum security - **Open Source**: Full source code is available at https://github.com/karanb192/reddit-mcp-buddy for security auditing ### GDPR & Privacy Compliance - **No Personal Data Collection**: We don't collect or process any personal data beyond what's necessary to authenticate with Reddit's API - **User Control**: You control all credentials and can delete `~/.reddit-mcp-buddy/auth.json` at any time - **Right to Erasure**: Simply delete the auth file or uninstall the server to remove all local data ### Questions or Concerns? If you have any privacy questions or concerns, please [open an issue](https://github.com/karanb192/reddit-mcp-buddy/issues) on GitHub. ## Testing & Development ### Testing Your Rate Limits Reddit MCP Buddy includes comprehensive testing tools to verify your authentication is working correctly: ```bash # Clone the repository first git clone https://github.com/karanb192/reddit-mcp-buddy.git cd reddit-mcp-buddy npm install # Test with your current environment settings npm run test:rate-limit # Test specific authentication modes npm run test:rate-limit:anon # Test anonymous mode (10 rpm) npm run test:rate-limit:app # Test app-only mode (60 rpm) npm run test:rate-limit:auth # Test authenticated mode (100 rpm) ``` The rate limit tester will: - Start a local server instance - Make rapid API requests to test rate limits - Display a real-time progress bar - Confirm which authentication tier you're using - Show exactly when rate limiting kicks in ### Interactive Authentication Setup (for local testing only) For local development and testing, you can set up authentication interactively: ```bash npx -y reddit-mcp-buddy --auth ``` This will prompt you for Reddit app credentials and save them locally. **Note: This does NOT work with Claude Desktop** - use environment variables in your Claude config instead. ### Testing with HTTP Mode To test the server directly in your terminal: ```bash # Run in HTTP mode on port 3000 npx -y reddit-mcp-buddy --http # Or with custom port REDDIT_BUDDY_PORT=8080 npx -y reddit-mcp-buddy --http ``` **Note:** The server runs in stdio mode by default (for Claude Desktop). Use `--http` flag for testing with Postman MCP or direct API calls. ## Installation Options ### Global Install ```bash npm install -g reddit-mcp-buddy reddit-buddy --http # For testing ``` ### From Source ```bash git clone https://github.com/karanb192/reddit-mcp-buddy.git cd reddit-mcp-buddy npm install npm run build npm link ``` ### Using Docker ```bash git clone https://github.com/karanb192/reddit-mcp-buddy.git cd reddit-mcp-buddy docker build -t reddit-mcp-buddy . docker run -it reddit-mcp-buddy ``` ### Claude Desktop Extension For one-click installation in Claude Desktop, download the pre-built extension: **📦 [Download reddit-mcp-buddy.mcpb](https://github.com/karanb192/reddit-mcp-buddy/releases/latest/download/reddit-mcp-buddy.mcpb)** **Installation:** Simply open the downloaded `.mcpb` file - Claude Desktop will automatically install the extension and the Reddit tools will be immediately available. #### Build from Source (Optional) If you prefer to build the extension yourself: ```bash git clone https://github.com/karanb192/reddit-mcp-buddy.git cd reddit-mcp-buddy ./scripts/build-mcpb.sh ``` **Note**: Most users should use the standard npm installation method shown in [Quick Start](#quick-start-30-seconds). ## Comparison with Other Tools | Feature | Reddit MCP Buddy | Other MCP Tools | |---------|-------------|----------------| | **Zero Setup** | ✅ Browse instantly; free keys unlock the rest | ❌ Keys required for everything | | **Max Rate Limit** | ✅ 100 req/min proven | ❓ Unverified claims | | **Language** | TypeScript/Node.js | Python (most) | | **Tools Count** | 5 (focused) | 8-10 (redundant) | | **Fake Metrics** | ✅ Real data only | ❌ "Sentiment scores" | | **Search** | ✅ Full search | Limited or none | | **Caching** | ✅ Smart caching | Usually none | | **LLM Optimized** | ✅ Clear params | Confusing options | | **Rate Limit Testing** | ✅ Built-in tools | ❌ No verification | ## Rate Limits | Mode | Requests/Minute | Cache TTL | Setup Required | |------|----------------|-----------|----------------| | Anonymous | 10 | 15 min | None | | App-only | 60 | 5 min | Client ID + Secret | | Authenticated | 100 | 5 min | All credentials | *Cache TTL applies to subreddit listings. Post details (10 min), search results (10 min), and user profiles (15 min) use fixed TTLs in all modes. Anonymous throughput is additionally bounded by Reddit's own per-IP RSS throttle, which is stricter than 10/min for uncached requests.* ## Why Reddit MCP Buddy? ### What others do wrong: - ❌ **Fake metrics** - "sentiment scores" that are just keyword counting - ❌ **Complex setup** - Requiring API keys just to start - ❌ **Bloated responses** - Returning 100+ fields of Reddit's raw API - ❌ **Poor LLM integration** - Confusing parameters and unclear descriptions ### What we do right: - ✅ **Real data only** - If it's not from Reddit's API, we don't make it up - ✅ **Clean responses** - Only the fields that matter - ✅ **Clear parameters** - LLMs understand exactly what to send - ✅ **Fast & cached** - Responses are instant when possible ## Examples ### Your AI can now answer: **"What are the top posts about GPT-4 today?"** ``` → search_reddit with query="GPT-4", time="day", sort="top" ``` **"Show me what's trending in technology"** ``` → browse_subreddit with subreddit="technology", sort="hot" ``` **"What do people think about this article?"** ``` → search_reddit with the article URL to find discussions ``` **"Analyze the user DeepFuckingValue"** ``` → user_analysis with username="DeepFuckingValue" ``` **"Get the comments from this Reddit post"** ``` → get_post_details with url="https://reddit.com/r/..." ``` **"What's trending across all of Reddit?"** ``` → browse_subreddit with subreddit="all", sort="hot" ``` ## Troubleshooting ### Common Issues **"Can't achieve 100 requests/minute"** - Ensure your app type is **"script"** not "web" or "installed" - Script apps created by one account can only authenticate as that same account - Run `npm run test:rate-limit:auth` to verify (requires cloning the repo) - If still failing, create a new script app while logged into the authenticating account **"Command not found" error** ```bash # Ensure npm is installed node --version npm --version # Try the full global-bin path $(npm prefix -g)/bin/reddit-mcp-buddy ``` **Browsing works but search / comments / user analysis fail** - Without credentials only `browse_subreddit` (served from Reddit's public RSS feed, no scores or comment counts) and the offline `reddit_explain` work - Anonymous browsing can also hit Reddit's own RSS rate limit (HTTP 429); the server retries automatically, but sustained throttling can still fail - Solution: Add Reddit credentials (see [Authentication](#authentication-optional)) **Rate limit errors** - Without auth: 10 requests/minute server cap, and Reddit's own RSS feed throttles harder per IP (the server retries automatically) - With app credentials only: 60 requests/minute - With full authentication: 100 requests/minute - Solution: Add Reddit credentials (see [Authentication](#authentication-optional)) **"Subreddit not found"** - Check spelling (case-insensitive) - Some subreddits may be private or quarantined - Try "all" or "popular" instead **Connection issues** - Reddit may be down (check https://www.redditstatus.com) - Firewall blocking requests - Try restarting the MCP server ### Environment Variables #### Authentication Variables | Variable | Description | Required | Rate Limit | |----------|-------------|----------|------------| | `REDDIT_CLIENT_ID` | Reddit app client ID | No | 60 req/min (with secret) | | `REDDIT_CLIENT_SECRET` | Reddit app secret | No | 60 req/min (with ID) | | `REDDIT_USERNAME` | Reddit account username | No | 100 req/min (with all 4) | | `REDDIT_PASSWORD` | Reddit account password | No | 100 req/min (with all 4) | | `REDDIT_USER_AGENT` | Custom user agent string (applies when credentials are configured) | No | - | #### Server Configuration | Variable | Description | Default | |----------|-------------|---------| | `REDDIT_BUDDY_HTTP` | Run as HTTP server instead of stdio | `false` | | `REDDIT_BUDDY_PORT` | HTTP server port (when HTTP=true) | `3000` | | `REDDIT_BUDDY_HOST` | Interface the HTTP server binds to | `127.0.0.1` | | `REDDIT_BUDDY_ALLOWED_ORIGINS` | Comma-separated browser origins allowed to call the HTTP endpoint | none | | `REDDIT_BUDDY_ALLOWED_HOSTS` | Comma-separated `host:port` values accepted in the Host header (DNS-rebinding protection) | loopback values when bound to localhost | | `REDDIT_BUDDY_NO_CACHE` | Disable caching (always fetch fresh) | `false` | > **HTTP mode has no authentication.** It binds to localhost so only your machine can reach it, and rejects Host headers outside the loopback set. Setting `REDDIT_BUDDY_HOST=0.0.0.0` exposes it to your whole network - only do that on a trusted network (e.g. inside Docker, which sets it deliberately). On a non-loopback bind the Host check is off by default, since clients legitimately arrive with a container IP or service name; set `REDDIT_BUDDY_ALLOWED_HOSTS` to restrict it. Browser requests are rejected unless their origin is listed in `REDDIT_BUDDY_ALLOWED_ORIGINS`; non-browser clients like Postman are unaffected. ## Technical Details ### Smart Caching System Reddit MCP Buddy includes intelligent caching to improve performance and reduce API calls: - **Memory Safe**: Hard limit of 50MB - won't affect your system performance - **Per-Content TTLs**: Post details (10min), user profiles (15min), search results (10min); subreddit listings use the mode default (15min anonymous, 5min with credentials) - **LRU Eviction**: Automatically removes least-used data when approaching limits - **Hit Tracking**: Optimizes cache based on actual usage patterns This means faster responses and staying well within Reddit's rate limits, all while using minimal system resources. ## Development ```bash # Install dependencies npm install # Run in development npm run dev # Build npm run build # Run tests npm test # Unit tests npm run test:integration # Integration tests npm run test:all # All tests # Test rate limits npm run test:rate-limit # Test with current environment npm run test:rate-limit:anon # Test anonymous mode (10 rpm) npm run test:rate-limit:app # Test app-only mode (60 rpm) npm run test:rate-limit:auth # Test authenticated mode (100 rpm) # Lint npm run lint # Type check npm run typecheck ``` ### Requirements - Node.js >= 18.0.0 - npm or yarn - TypeScript 5.5+ ## Contributing PRs welcome! See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines. We keep things simple: - No fake analytics - Clean, typed code - Clear documentation - Fast responses ## Support - 🐛 [Report bugs](https://github.com/karanb192/reddit-mcp-buddy/issues) - 💡 [Request features](https://github.com/karanb192/reddit-mcp-buddy/issues) - ⭐ [Star on GitHub](https://github.com/karanb192/reddit-mcp-buddy) ## 🔗 Related Resources ### Official MCP Resources - **[MCP Registry](https://registry.modelcontextprotocol.io)** - Official registry of MCP servers - **[MCP Specification](https://modelcontextprotocol.io/specification/latest)** - Official Model Context Protocol specification - **[MCP TypeScript SDK](https://github.com/modelcontextprotocol/typescript-sdk)** - SDK used to build this server - **[MCP Servers Repository](https://github.com/modelcontextprotocol/servers)** - Collection of official MCP server implementations - **[Awesome MCP Servers](https://github.com/punkpeye/awesome-mcp-servers)** - Community-curated list of MCP servers ### Where to Find This Server - **[MCP Registry API Link](https://registry.modelcontextprotocol.io/v0/servers?search=reddit-mcp-buddy)** - Direct API query for this server - **[MCP Registry Search](https://registry.modelcontextprotocol.io)** - Search for "reddit" to find all versions - **[NPM Package](https://www.npmjs.com/package/reddit-mcp-buddy)** - Install via npm/npx - **[GitHub Repository](https://github.com/karanb192/reddit-mcp-buddy)** - Source code and issues #### View All Versions via API ```bash # Get all versions of reddit-mcp-buddy from the registry curl -s "https://registry.modelcontextprotocol.io/v0/servers?search=reddit-mcp-buddy" | jq # Get just names, version numbers, and latest flag curl -s "https://registry.modelcontextprotocol.io/v0/servers?search=reddit-mcp-buddy" | \ jq '.servers[] | {name: .server.name, version: .server.version, isLatest: ._meta."io.modelcontextprotocol.registry/official".isLatest}' ``` ## License MIT - Use it however you want! --- Made with ❤️ for the MCP community. No venture capital, no tracking, just a good MCP server. Built by [Karan Bansal](https://karanbansal.in) (Head of AI at ArmorCode). I write about Claude Code, MCP, and production agentic AI at [karanbansal.in/blog](https://karanbansal.in/blog/).