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.
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 LangSmith Fleet will discover automatically):
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.
Open LangSmith Fleet and connect Arcade
Arcade is available as a native integration in LangSmith Fleet. Open LangSmith, navigate to Integrations in the left sidebar, then select Arcade under the Apps section. Click Connect to link your Arcade account.
Click Connect, then click Allow to authorize Arcade. Your gateways will be discovered automatically.
Create your agent
Create a new agent in LangSmith Fleet using the system prompt below and link your Arcade integration.
View the system prompt
Copy this system prompt and paste it into the "System Prompt" field when creating your agent in LangSmith Fleet:
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
Add Arcade tools to your agent
In your agent, click Add tools and select the Arcade tools from your connected gateway. 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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