How to set up the Sandcastles MCP in Replit
MCPUpdated October 8, 2026
Connecting Sandcastles to Replit Agent
You can add Sandcastles to Replit as an MCP server, so Replit Agent can use your Sandcastles data in any of your projects. The quickest way is the one-click link below.
Before you start
- You need a Pro, Visionary or Titan plan. The MCP isn't included in the Starter plan.
- The Sandcastles MCP server URL is
https://mcp.sandcastles.ai/. You can also copy it in Sandcastles from Settings > Connectors: hover over the URL on the MCP card and click Copy.
Option 1: Use the one-click link (recommended)
- Open this link: Add Sandcastles to Replit. Replit's Integrations page opens with Sandcastles already filled in.
- Click Test & save.
- Sign in with your Sandcastles account and approve the connection.
Option 2: Add it manually
- Go to
replit.com/integrations. - Go to MCP Servers for Replit Agent > + Add MCP server.
- Enter
Sandcastlesas the display name. - Enter this URL:
https://mcp.sandcastles.ai/
- Click Test & save.
- Sign in with your Sandcastles account and approve the connection.
Using Sandcastles in Replit Agent
Once it's connected, Sandcastles is available to Replit Agent in all your projects. Ask for it by name, for example:
Use the Sandcastles MCP server to find the top hooks in my watchlist.
Important notes
- If your account isn't on a Pro, Visionary or Titan plan, Sandcastles returns "Your Sandcastles plan doesn't include MCP access." instead of results.
- Analyzing a video that isn't in your workspace yet uses 1 credit. If it's already in your workspace, it doesn't use another credit.
- The MCP works in the workspace you last had open in Sandcastles. You can ask Replit Agent to list your workspaces or switch to another one. Switching also changes the workspace you see the next time you open Sandcastles.
Related articles
- How to set up the Sandcastles MCP in any AI assistant
- How to set up the Sandcastles MCP in Cursor
- Does using the Sandcastles MCP cost credits?
If you have any questions, please reach out to support@sandcastles.ai.
