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Extensions (under More in the sidebar) is where you give Overlay and its agents access to more than your workspace. It has three parts: Connectors, Skills and MCPs.

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Connectors

Connectors link the apps you already use, such as email, calendar, documents and issue trackers. Choose a connector, sign in to that app, and its actions become tools for your chats and agents.
  • Personal connectors use your own account in that app.
  • Workspace connectors use one account shared by the whole workspace. It stays connected when the person who set it up leaves. Agents answering in a shared channel use only workspace connectors.
Disconnect a connector from the same page at any time.

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Skills

A skill is a saved set of instructions for a task you repeat: a report format, a review checklist, the way your team writes release notes. Choose New skill, give it a name and write the instructions. Chats and agents can use any skill you can see, and an agent can draft a new skill from a conversation. Skills also show up as prompts in apps connected over MCP. See Connect ChatGPT, Claude, and other apps.

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MCP servers

If a tool you need speaks MCP, add it under MCPs with Add server: its address and, if it needs one, a key. Its tools then work in your chats and agents. You can require approval for each tool, so a chat asks before running it. A server shared with the workspace runs with the credentials of the person who added it; other members can use its tools but never see the key.

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Who can share

Owners and admins choose whether members can share skills, MCP servers and connectors with the workspace, in Settings → Workspace → Sharing & links (“Anyone can share skills, MCP servers, and connectors”). For what each group of tools does, see Tools.