> 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/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymanager.md).

# Use Chat Messages Retriever in Duaer

Chat Messages Retriever in Duaer is an AI or cluster node, often used with model, tool, or vector-store sub-nodes. Node note: Retrieve chat messages from memory and use them in the workflow
## Chat Messages Retriever in Duaer

Chat Messages Retriever is used in Duaer’s AI or cluster features, often wired with chat-model, tool, or vector-store sub-nodes.

The product’s node note is: Retrieve chat messages from memory and use them in the workflow.

## Credentials and parameters

Create the credential type this service needs under Credentials.

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 Chat Messages Retriever to a Duaer digital organization?

Open the node panel on the Duaer canvas, search for Chat Messages Retriever, 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 Chat Messages Retriever 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.