> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/integrations/builtin/app-nodes/n8n-nodes-base.mattermost.md).

# Use Mattermost in Duaer

Use Mattermost in a Duaer digital organization to call that service. Save the connection under Credentials, then pick a resource and operation on the node.
## Mattermost in Duaer

Mattermost is an app node in Duaer for calling that service’s API from a digital organization.

Search for Mattermost in the node panel, drop it on the canvas, then fill resource and operation fields.

## Credentials and parameters

Credential notes are under [Mattermost credentials](/integrations/builtin/credentials/mattermost.md).

Parameters accept expressions. Tool parameters that an AI Agent should fill use $fromAI. When a run fails, read the error on the node output first.
## Questions

### How do you add Mattermost to a Duaer digital organization?

Open the node panel on the Duaer canvas, search for Mattermost, and drop it onto the digital organization. Connect it after a trigger or a previous node. If auth is required, save the credential first and select it on the node.

### What should you check first when Mattermost fails in Duaer?

Read the error text on that node’s output, then confirm the credential still works and required parameters are filled. For app nodes, also check permissions and quota on the provider side.