Hronaut

Connects your coding agent to Hronaut — a visible desktop browser it can drive over MCP. Watch every step, pause and take over, keep logins between sessions. Requires the Hronaut app (free 10-day trial at hronaut.dev).

This extension adds Hronaut's MCP server to the editor, so agents such as GitHub Copilot's agent mode can use it without an mcp.json entry.

Use it

Install and start Hronaut.
Install this extension. Hronaut appears in the editor's MCP servers (MCP: List Servers).
Ask the agent to use Hronaut, for example: “Using Hronaut, create a new isolated workspace, open https://example.com and tell me the page heading.”

How it connects

The extension connects to http://127.0.0.1:47812/mcp, Hronaut's local endpoint. When the editor starts the server, the extension reads Hronaut's owner token from HRONAUT_MCP_TOKEN or from the token file in Hronaut's profile and sends it with the connection, so the token is never written to your settings. Hronaut accepts the connection without a token while its MCP authentication is off.

Changed Hronaut's MCP port? Set Hronaut: Mcp Port (hronaut.mcpPort) in your user settings to the same port, or start the editor with HRONAUT_MCP_PORT set as you do for Hronaut; as in Hronaut, the variable comes first.
Hronaut uses another profile folder? Start the editor with HRONAUT_USER_DATA_DIR set as you do for Hronaut.
Added Hronaut to mcp.json before? Remove that entry, so the agent does not get Hronaut's tools twice.

Hronaut runs on your computer, so a cloud-hosted agent cannot reach it. See the setup guide and the privacy policy.

License

This extension is open source under the MIT License: you may use, change and share it, including in paid products. Hronaut, the app it connects to, is source-available under the Subscription and Trial License. The 10-day trial starts with the first agent tool call, with no credit card required. Ongoing use of the app requires a subscription afterward: $4/month or $24/year per named user (50% off $48).