With the MCP Standard Tools SuiteApp role permissions (screenshot attached), you can see only Reporting tools using

https://{{account_id}}.<http://suitetalk.api.netsuite.com/services/mcp/v1/suiteapp/com.netsuite.mcpstandardtools|suitetalk.api.netsuite.com/services/mcp/v1/suiteapp/com.netsuite.mcpstandardtools>

under the

tools/list

API call or under the MCP Client tools list. You need to assign REST Web Services permission to your custom MCP role for all tools to appear, as stated in the article shared.