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How to log in from a Bitwarden vault and stop before submitting with Fastbrowse

Fill a login form from a vault item, then pause for confirmation before any submit.

Credentials. The vault login's username, password and any one-time code are typed into the page, so a vault item saved with the wrong URI or a shared machine can expose them.

Who it is forAn operator who must sign into a web service with a stored password and wants a human to approve any form submission.

The problemPasting a password into an agent prompt exposes it, and a browser agent can submit changes without a review step.

The outcomeThe login fields are filled from the vault on the start origin only, and the run stops at needs_confirmation before any submit, unless --authorize is given.

What you need first

  • uv, which fetches Python 3.13 or newer
  • OPENROUTER_API_KEY, or AI_GATEWAY_API_KEY for the Vercel AI Gateway
  • BROWSER_USE_API_KEY for the default cloud browser, or the --local flag for local Chrome

Steps

  1. Install and unlock the Bitwarden CLI, then run export BW_SESSION="$(bw unlock --raw)"
  2. Run uv run fastbrowse "<task>" --start <start URL> --bitwarden <vault item name> without --authorize (inferred, check the README)
  3. Read the result: a run that reaches needs_confirmation has not submitted anything
  4. Add --authorize only after you have checked the planned submit

Prompt for your agent

Use the fastbrowse repo to sign into <start URL> with the Bitwarden item <vault item name> and report the page the run stops on. Run `uv run fastbrowse "<task>" --start <start URL> --bitwarden <vault item name>` without --authorize. Verify the result reports needs_confirmation and that no submit happened.

Caveat. The item's saved URIs must match --start, so a login stored under another address will not be used at all.

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