browser-login

Browser Login

Authenticate against a target site once, then vault the resulting session credentials so subsequent skills (browser-extract, browser-form-fill, browser-test) can reuse them without re-driving the auth flow. Borrows the pattern from Browserbase's cookie-sync/SKILL.md but stores the resulting context in AgentDB rather than on a hosted backend.

When to use

• Establishing reusable auth for a host the agent will visit repeatedly.
• Refreshing a vaulted cookie set whose expiry has passed.
• Capturing an MFA-protected session that requires interactive completion.

Steps

1. Open a recorded session via browser-record.
2. Drive the auth flow — fill credentials with browser_fill / browser_type. Credentials come from the user or environment; do not read them from .env or paste them into the trajectory args.
3. Handle MFA (when --mfa): pause for user input or invoke the user's TOTP helper; capture only the resulting redirect, not the code itself.
4. Capture cookies via browser_eval:

   document.cookie  // returns the cookie string for the active document
   

   Or use the Playwright context API where exposed.
5. AIDefence sanitize:

   # Each cookie value passes aidefence_scan to flag raw secrets / high-entropy tokens.
   

   Tokens that look raw get vault-wrapped (an opaque handle) before AgentDB store; raw values never enter the namespace.
6. Store in browser-cookies:

   npx -y @swarmdo/cli@latest memory store --namespace browser-cookies \
     --key "<host>" \
     --value "{vault_handle:<opaque>, expiry:<iso>, aidefence_verdict:safe}"
   

7. Return the vault handle so downstream skills can mount it via the planned browser_cookie_use MCP tool.

Caveats

• Never log raw cookie values, tokens, or passwords. The trajectory step for the auth POST records only the form field names and a <redacted> placeholder for values.
• The browser_cookie_use MCP tool is reserved (ADR-0001 §7) but not yet implemented. Until then, downstream skills mount the vaulted cookies via a helper bash function in scripts/ (TBD).
• Some sites bind cookies to a UA fingerprint; if a vaulted cookie fails on reuse, re-run browser-login. Do not attempt to fingerprint-match yourself.
• This skill is not a credential storage solution. The vault-handle pattern protects against AgentDB leaks, not against compromise of the agent's environment.