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Plugins connect Onyx agents to the tools that your team uses. With a plugin, an agent can read live data, such as a Linear issue, or take an action, such as post a Slack reply. Your admin adds plugins for the workspace. You connect your account and choose where to use each plugin.
In Onyx 5.0, MCP and OpenAPI actions became plugins. Find them in Plugins in the sidebar, and in Chat under Actions → Plugins. Craft Apps moved from Craft → Apps to Plugins in the Craft sidebar.
The Plugins page with an MCP server and a Slack Craft App

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Plugin types

For Craft Apps, see Craft Apps.

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Plugins and Onyx knowledge

Plugins and connectors give agents different access.
  • Onyx knowledge is an index of company documents. Onyx applies the source permissions, so you find only documents that you can access. Search is read only.
  • Plugins call the external service live. When you connect your own account, the service applies your permissions. The plugin can read only what your account can read, and it can change content only if your account and your admin allow it.

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Connect a plugin

Select Plugins in the Chat sidebar or the Craft sidebar. Use the All, Connected, and Needs sign-in filters, or search by name. The status icon on each plugin shows where you can use it: Main Chat, Custom agents, and Craft.
1

Open the plugin

Click a plugin to open its details.
2

Connect your account

The Connection tab shows what the plugin needs:Sign in with the account that the agent should use. The agent acts as that account.
3

Choose where to use it

Set your personal defaults:Click Save.Plugin details with Ready to use, Enable in default Chat, and Enable in Craft
If a setting says Disabled by admin, your admin turned off the plugin for that surface. You cannot turn it on. Custom agents that use the plugin can still use it.

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Review tools

The Tools tab lists the tools that the plugin gives the agent. For MCP plugins in Craft, Approval settings shows which tools run automatically, which ask for your approval, and which are disabled. The Tools tab for an MCP plugin with three tools If your admin lets users manage approval settings, you can change the policy for tools that the admin did not disable.

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Use plugins in Chat

Click the actions button in the message bar, then select Plugins. Turn a plugin on or off for the current chat, or click Browse plugins to open the Plugins page. The actions menu in Chat with the Plugins menu open The agent decides when to call a plugin tool. To guide it, name the plugin or the service in your message. For example: “Use DeepWiki to explain how the onyx-dot-app/onyx repository handles authentication.” In Chat, the agent calls plugin tools without an approval prompt. Check the result in the service after a change.
Custom agents use the plugins that the agent builder selected. Your default Chat settings do not change them. See Agents.

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Disconnect a plugin

Open the plugin and click Disconnect. Onyx removes your account connection. Workspace availability stays the same. If more than one plugin uses the same OAuth configuration, they share one connection. Disconnecting one of them disconnects all of them.

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Built-in actions

Onyx also includes built-in actions that do not need a plugin:

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For admins

Manage plugins

Add plugins and set workspace availability.

Craft Apps

Let Craft act as you in Slack, Gmail, Notion, and more.