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How to sign in to a site with 1Password, keeping secrets from the agent with Agent Chrome Relay

Have Chrome Relay type your 1Password credentials so the agent never sees them.

Credentials. This flow touches your 1Password vault and login secrets, so only point it at sites you own and check which vault items the agent can reference.

Who it is forA developer who uses 1Password and wants an agent to log into a site without being given the password or 2-step code.

The problemAgents need to log in to reach pages, but handing them passwords or one-time codes is a security risk.

The outcomeChrome Relay types the password, 2-step code or passkey from your shared 1Password vault into the login page, and the agent only sees the result of the sign-in.

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. Build with Xcode command line tools installed (xcode-select --install), then run ./build and ./chrome-relay setup
  2. Install and pin the Chrome Relay extension in the profile you use for the site
  3. Use an op:// reference for the secret field, for example chrome-relay fill <field> op://<vault>/<item>/<field> (inferred, check the README)
  4. Run the login step and check the page with chrome-relay snapshot --text (inferred, check the README)

Prompt for your agent

Using the Chrome Relay repo at aindeev/agent-chrome-relay, sign in to <site URL> by filling the password field with an op:// reference from 1Password, never printing the value. Expected output: the signed-in page's title. Verify that the title matches <expected title> before reporting success.

Caveat. The README says 1Password is the only password manager supported for now, and passkeys and the Secure Enclave need the Xcode command line tools.

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