Check these points in order:

• Your MATE Desktop license is active.

• MATE Desktop is open.

• Your host app is open.

• The MATE plugin is open inside the host app.

• In the plugin, Settings > MCP > Connect to “MATE Desktop App” is enabled.

• Connected Apps in MATE Desktop shows the host app as connected with a blue frame.

• The switch for that host app is enabled.

• Your AI app has the MATE server or connector enabled.

• The MCP URL exactly matches the value shown in MATE Desktop.

• You restarted the AI app after adding or changing the connection.

• You started a new chat or agent session.

Still not connected?

Quit and reopen MATE Desktop, restart the AI app, and start a new chat. Ask:

Do you see MATE Desktop? Which MATE tools are available?

If the server appears but no host tools are available, confirm that the host app and its MATE plugin are still open.