Connect Dify to Mattermost

This recipe puts your Dify app behind a Mattermost bot. LangBot receives messages from Mattermost, runs them through a pipeline, and sends the answer back, so you do not write any platform code.

Dify builds chat assistants, Chatflows, Agents and Workflows. LangBot calls the published app through its Service API, so prompts, tools and knowledge stay in Dify.

What you need

• A running LangBot instance: LangBot Cloud (no server needed) or a self-hosted deployment with Docker or uvx langbot.
• A Dify account or instance that LangBot can reach over the network.
• A Mattermost bot account (role Member) and its access token, plus your Mattermost server URL.

Networking

LangBot only needs to reach your Mattermost server; Mattermost does not need to reach LangBot.

1. Prepare Dify

1. Build and publish a Chat Assistant (including Chatflow), Agent or Workflow app in Dify.
2. Open the app's Access API page and create an API key.
3. For a Workflow app, output the answer under the key summary.

2. Create a pipeline

Open Pipelines in the LangBot WebUI, create a pipeline (or edit the default one) and set AI as follows. If the runner is not listed, install the official runner plugin from Plugins or the LangBot Space marketplace.

3. Create the Mattermost bot

1. Create the bot account in Mattermost (choose post:all for direct messages) and copy its token; it is shown only once.
2. Create a bot with the Mattermost adapter, enter the server address and token, and bind a pipeline.

4. Bind and test

Open the bot, select the pipeline you created, save and make sure the bot is enabled.

Send the bot a direct message, or mention it in a channel it has joined.

Troubleshooting

• Self-hosted Dify in Docker on the same host: put both stacks on a shared Docker network and use the container address (for example http://dify-nginx/v1), not localhost.
• Chatflow apps only return what the Answer node outputs.
• Administrator-related features are not supported; keep the bot role as Member.
• Disable streaming on the bot if your pipeline or AI provider does not support it.
• Check Monitoring in the WebUI: every message, pipeline run and error is recorded there.

FAQ

Do I need a server with a public IP for Mattermost?

No. LangBot only needs to reach your Mattermost server; Mattermost does not need to reach LangBot.

Does the Mattermost bot support streaming replies?

Yes. Enable streaming on the bot; the AI back end must also stream. See the platform feature matrix for details.

Can the same Dify setup serve other platforms too?

Yes. A pipeline can be bound to many bots, so one configuration can answer on several platforms at once.

Related guides

• Full Mattermost setup guide
• Full Dify runner guide
• Other AI back ends on Mattermost: n8n · Coze · Langflow · DeepSeek · OpenAI (ChatGPT models)
• Dify on other platforms: Telegram · Discord · Slack · Lark (Feishu) · DingTalk · WeCom (internal app)