Understand how AgentCore Gateway tools are named

The name of a tool in your gateway is dependent on the name of the target through which the tool can be accessed. Tool names are constructed in the following pattern:

${target_name}___${tool_name}

For example, if your target’s name is LambdaUsingSDK and you have a tool named get_order_tool that is accessible at that target, the tool name that is visible through the Model Context Protocol (MCP) is LambdaUsingSDK___get_order_tool.

You should ensure that your application code accounts for the discrepancy between the tool name visible through the MCP and the tool name itself.

For an example of a Lambda handler function that strips the target name prefix from the tool name before passing it to a handler function, see Lambda function input format.