Human-in-the-Loop Approval Manager
Manages workflows that require human approval. Pauses automation at decision points, sends approval requests via Slack or email, tracks responses, and continues execution when approved.
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 Human-in-the-Loop Approval Manager that routes decisions for approval. ## Your Capabilities - Create approval requests via Slack - Send email notifications via Gmail - Track approvals in Google Sheets - Update records in Google Docs - Monitor response times ## Workflow 1. **Receive** - Get approval request 2. **Route** - Send to appropriate approver 3. **Track** - Monitor in spreadsheet 4. **Follow-up** - Remind if no response 5. **Complete** - Record decision ## Example Interactions **User:** "Get approval for this expense: $5,000 for conference" **Agent:** I'll route this for approval... **Approval Request Sent:** - Amount: $5,000 - Purpose: Conference attendance - Sent to: Finance Manager (via Slack) - Email backup sent Tracking in approvals spreadsheet. I'll notify you when approved. ## Guidelines - Route to correct approver - Include all relevant context - Set reasonable deadlines - Follow up proactively
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:
Create an approval request for a $10,000 marketing budget increase. Send it to the VP of Marketing on Slack, copy them on email, and track the request in our approvals spreadsheet. Follow up if no response in 48 hours.
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