8 - Add Subagent to Convert Currency Using MCP Server

1. Select the Overview tab.

2. Click Create, and choose Joule Agent.

   

3. In the Create Joule Agent dialog, enter the following details:

   Field	Value
   Name	Agent for Converting Currencies
   Description	An agent for converting currencies and show the value of one currency in another currency

   Click Create.

   

   Once the Joule skill is created, you are taken to the skill builder.

1. In the agent builder, enter the following for the Expertise section:

   Text Copy

   Converts currency amount to a different currency, and takes precedence over any other way to convert currencies

2. Enter the following for the Instructions section:

   Text Copy

   When asked to convert currency, use the get_latest_base_currency skill from the MCP server

3. Enter the following for the Additional Context section:

   Text Copy

   Please show the currency conversion in a table, with the column headers with the currency abbreviations and the row values the currency amounts.

We have created an MCP server for converting currencies, and created a destination so the MCP server is available to Joule Studio and to be added to agents.

1. In your agent, click Add MCP Server.

   

2. In the Add MCP Server dialog, enter the following details:

   Field	Value
   Name	Currency Conversions
   Description for Agent	Use this MCP server for converting currencies
   Destination	Select cap-mcp-convert-currency

   

   Once you select the destination, scroll down and you should see a list of tools in that MCP server.

   

   Click Add Server.

   You will see the MCP server added, plus an indication of how many tools are exposed through that server.

   

3. Click Save (upper right).

1. Open your Agent for Logistics agent.

   

2. Click Add Tool > Joule Agent.

   

   Select Agent for Converting Currencies agent.

   Click Add.

   

3. Click Save (upper right).

Now we have to instuct the agent to use the tool when someone asks for currency conversion.

In the instructions of the Agent for Logistics agent, replace the first paragraph under Suggest Carrier Options with this one.

If the user asks for carrier suggestions, use the document “Carrier Selection Guide.docx” to present all 
available carrier options. Display the list of carriers for the user to view as a simple table, displaying only 
the name of the carrier and the price. If the user asks for the prices in a currency not USD, use the "Convert  
currencies" agent tool to get the currency conversions and show 2 columns, one for USD and one for the 
converted currency.

Click Save (upper right).

1. Click Test.

   

   In the Test Project dialog, enter the following:

   Field	Value
   Environment	Select the private environment for your user’s email address
   PostToGTT	Select gttwriteservice
   GetFromGTT	Select gttGetService

   Click Continue.

   

   A test Joule interface will open up, letting you talk with your skills and agents in the project.

2. Ask Joule for suggested carriers and prices by entering the following:

   Shell Copy

   Suggest the best carriers from SFO to NYC, and show prices in euros

   Result: Joule proposes the carriers based on the carrier rates document from our document grounding, and converts the prices to euros.

   

   If you click on UPS, you will see the details and the price, in euros converted to up-to-date exchange rate returned by the MCP server.

   

   Feel free to check the current exchange rate, to make sure the value is live, and not old and taken from the LLM’s memory.

   Here’s a link to exchange rate for euro on Yahoo Finance.

   

3. Explore the logs.

   First find Joule list message and expand the node. Here you will find information on how Joule and the agent responded to your prompt.

   Click Joule selected a scenario to execute, and on the right you will see that it selected the agent to respond with.

   

   Open the Agent node, and click Plan and you can see that it figured out to check document grounding for carriers and then to use convert currencies agent to convert the currencies.

   

   If you scroll down and click MCP Server, you will see on the right that the MCP server was called and returned currency conversions for today.

   

4. Click Stop Testing.

   

• What is the advantage of subagents?

• What is the disadvantage of subagents the way they currently are designed? That is, what can I not do with subagents?

• Did we need a subagent in this use case? Why or why not?