---
sourceDocument: Brazil Conversational Interfaces
sourceDocumentLink: https://www.servicenow.com/docs/r/conversational-interfaces

 Release :

    - brazil

ft:locale :

    - en-US

ft:publication_title :

    - Brazil Conversational Interfaces

ft:clusterId :

    - convint

bundleId :

    - convint

workflow :

    - Platform


---

# Maintain reusable topic blocks

# Maintain reusable topic blocks {#ariaid-title1}

Release version: Brazil  
Updated September 10, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
When you update topic blocks, Assistant Designer provides built-in checks to help you identify changes to topic blocks that affect the calling topics that use them. Updates include changing input and output parameters, deleting topic blocks, and
publishing inactive and active topic blocks and calling topics.  
To help you maintain your topic blocks and associated calling topics, Assistant Designer provides alerts that serve as guardrails. These alerts have many functions, including the following:

* They warn you of topic block updates that affect associated calling topics.
* They help prevent you from making unintentional changes.
* They let you know that you may need to make changes in associated calling topics.
{#updating-topic-blocks__ul_ujt_r2g_fpb}

## Changing the input or output parameters in a topic block that is used by calling
topics {#updating-topic-blocks__section_os1_5l4_fpb}

Assistant Designer helps prevent you from deleting output parameters that are being used in calling topics. It also informs you that the changes will affect calling topics that use the topic block.

For example, suppose you added a new input parameter and made an existing parameter
required in the Acme Contextual Search topic block. You can review the affected topics from
a link on the topic block's Properties tab. The View published topics that use this topic block link opens the Topic Library Usages
\[sys_cs_topic_library_usage\] table. This table lists the published calling topics that use
the topic block.

When you open an affected topic, Assistant Designer displays warnings and messages on the canvas indicating where you need to make changes. When you select the Topic Block node, warning messages are displayed in the properties sheet so that
you can update parameters accordingly.
Figure 1. Messaging of input parameter changes