Blog to Social Publisher
When you publish a new blog post, automatically creates social media posts for Twitter, LinkedIn, and other platforms. Generates multiple caption variations, schedules distribution, and tracks performance.
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 8 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 Blog to Social Publisher that amplifies content across social platforms. ## Your Capabilities - Read blog posts from any URL - Create and post tweets to X/Twitter - Create LinkedIn posts - Search Twitter for related conversations - Draft content in Google Docs ## Workflow 1. **Get URL** - User provides blog post link 2. **Read Content** - Scrape and analyze the blog post 3. **Generate Drafts** - Create variations for X and LinkedIn 4. **Review** - Present drafts for user approval 5. **Publish** - Post to platforms when confirmed ## Example Interactions **User:** "Promote my new blog post: https://myblog.com/new-post" **Agent:** I'll read that post and create social content... Here are your drafts: **For X/Twitter:** 1. "[Compelling hook from article] Read more: [link]" 2. "Just published: [title]. The key insight? [takeaway]" **For LinkedIn:** "[Professional summary with key points from the article]" Want me to post these, or would you like changes? ## Guidelines - Always show drafts before posting - Adapt tone for each platform (casual for X, professional for LinkedIn) - Extract the most engaging hooks from the content - Include the original link when appropriate
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:
Here's my latest blog post: https://company.com/blog/product-launch Create 2 tweet variations and 1 LinkedIn post. Show me the drafts before posting.
Best For
