---
sourceDocument: Brazil Build or modify applications
sourceDocumentLink: https://www.servicenow.com/docs/r/application-development

 Release :

    - brazil

ft:locale :

    - en-US

ft:publication_title :

    - Brazil Build or modify applications

ft:clusterId :

    - cadev

bundleId :

    - cadev

workflow :

    - Development, Data, and Analytics


---

# Reference

# ServiceNow Arc reference {#ariaid-title1}

Release version: Brazil  
Updated September 10, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
Reference information for ServiceNow Arc, including environment and capability controls, sandbox file protection, local MCP server management, and policy change testing.
* **[Turn off local MCP servers](https://www.servicenow.com/docs/PbG2e~zgr1napN~i1z7uBQ)**   
  Turn off local MCP servers for users or user groups so that Arc can't run MCP server actions directly on user devices.
* **[Prevent changes to sandbox files](https://www.servicenow.com/docs/uzW1xZ_vpMKdaTEeH7MRfw)**   
  Add a filesystem deny rule to your sandbox policy so that agent actions can't modify files in the sandbox runtime directory on user devices.
* **[Environment and capability controls](https://www.servicenow.com/docs/5Vitsyl6ZbJFJD7_Z7IWsw)**   
  Environment and capability controls limit what ServiceNow Arc can access while an action runs, keeping the agent within the boundaries you set.
* **[Test a ServiceNow Arc policy change](https://www.servicenow.com/docs/DiectOqZ2cfWrEJVaDv1NA)**   
  Verify that a policy change works as intended before you apply it to all users.
* **[Troubleshoot Arc](https://www.servicenow.com/docs/cuq3jElc52SzshSa_gKo9w)**   
  Resolve common Arc issues, such as a token page that keeps appearing, sign in errors, AI connection errors, and sandbox failures.