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How to fill and submit a web form in your signed-in Chrome with Agent Chrome Relay

Have an agent complete a multi-step web form in a background tab using your existing login.

Who it is forA developer whose coding agent needs to submit a form, such as inviting a teammate, on a site where they are already signed in.

The problemDriving a page one command at a time costs the agent a model round trip per click, and the agent needs your logins to get past sign-in.

The outcomeThe goal is carried out in a background tab with the given data, and the run ends with a clear result: done when the success text is found, or handed back to the agent with the page and the choices it faced.

What you need first

  • A Mac with macOS and Google Chrome
  • Go 1.25 or newer (`brew install go`)
  • Chrome Relay extension installed from the Chrome Web Store and pinned in each Chrome profile agents should use
  • Optional: Xcode command line tools for 1Password and Secure Enclave passkeys
  • Optional: 1Password, for sign-ins and op:// references
  • Optional: the Chrome Relay Approve iPhone app from TestFlight, for approvals away from the Mac

Steps

  1. Clone the repo: git clone https://github.com/aindeev/agent-chrome-relay
  2. Enter the folder and build: cd agent-chrome-relay then ./build
  3. Run setup: ./chrome-relay setup
  4. Install Chrome Relay from the Chrome Web Store in your Chrome profile, pin it, and check with chrome-relay doctor
  5. Run the goal: chrome-relay do "Invite the new teammate as an admin" --url https://app.example.com/team/invite --profile [email protected] --data "[email protected]" --data "Role=Admin" --until "text:Invitation sent" (inferred, check the README)

Prompt for your agent

Using the Chrome Relay repo at aindeev/agent-chrome-relay, run `chrome-relay do` with the goal "<goal>" on <site URL>, passing the values in <data> as --data options and --until "text:<success text>". Report the exit code and the final page text; exit code 2 means hand back to the user with the page state. Verify that the success text appears before reporting done.

Caveat. The relay only works on Macs where the owner has set up the extension, and `do` can hand control back to the agent when it is unsure, so check the outcome before trusting it.

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