Reddit Trend Digest
Monitors specified subreddits for trending topics, hot discussions, and relevant mentions. Summarizes top posts with AI, identifies emerging trends, and delivers daily/weekly digests via email or Slack.
Toolkits Needed
You'll need access to these toolkits in your Arcade MCP Gateway:
Setup Guide
Sign up for Arcade
Create a free Arcade account to get access to MCP Gateway.
Create Arcade Account →Create a new MCP Gateway
Navigate to MCP Gateway page in Arcade, then click Create MCP Gateway.
Provide a slug that becomes your MCP URL (this is what you'll configure in Agent Builder):
my-agent, your MCP URL will be:https://api.arcade.dev/mcp/my-agent Select the specific tools you need
Arcade MCP Gateway gives you fine-grained control over exactly which tools your agent can access. Select these specific tools from the toolkits:
Why this matters: Instead of granting access to entire toolkits with hundreds of tools, you're selecting only the 9 specific tools this agent actually needs. This precision reduces risk and keeps your agent focused.
Create the gateway and copy your MCP URL
Click Create Gateway. Copy the MCP URL — this is all you need to connect to LangSmith!
https://api.arcade.dev/mcp/my-agent No tokens needed! Arcade uses OAuth for secure authentication — you'll sign in with your Arcade account in LangSmith.
Open LangSmith Agent Builder
This agent is pre-created in the LangSmith Agent Builder templates. Go to LangSmith, find this template, and start using it right away!
Open LangSmith Agent Builder →Can't find this template? Click here for the system prompt
If you don't see this template in your account, you can create the agent manually. Copy this system prompt and paste it into the "System Prompt" field when creating a new agent:
You are a Reddit Trend Digest agent that monitors subreddits and surfaces insights. ## Your Capabilities - Browse and search subreddits - Get post content and discussions - Send summaries via Slack - Create digest documents in Google Docs ## Workflow 1. **Monitor** - Check specified subreddits for trending content 2. **Analyze** - Read post content and identify key themes 3. **Summarize** - Create digestible summaries of top discussions 4. **Deliver** - Send digest via Slack or save to Google Docs ## Example Interactions **User:** "What's trending in r/artificial this week?" **Agent:** I'll check r/artificial for hot posts and discussions. Here's what I found: 1. **[Post Title]** - 500 upvotes - Discussion about [topic] 2. **[Post Title]** - 300 upvotes - Community debate on [topic] Want me to send this digest to Slack or create a Google Doc? ## Guidelines - Focus on high-engagement posts - Summarize key discussion points - Identify emerging trends - Respect subreddit rules and context
Connect your Arcade MCP Gateway
In the Agent Builder, click the MCP button and paste your MCP URL from Step 4:
Click Connect to initiate the OAuth flow:
Click Allow to grant LangSmith access to your Arcade tools:
Select the tools for your agent
After connecting, click the Add tools button. Your gateway exposes only the specific tools you configured:
Start using your agent!
That's it! Your agent is now connected to Arcade's tools. Start chatting with your agent to test it out.
Try It: Example Prompt
Once your agent is set up, try this example prompt to test it:
Give me a digest of the top posts from r/startups and r/entrepreneur from the past week. Send the summary to our #trends Slack channel.
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