Automate logins with the Steel Credentials API without exposing secrets to the agent
domain: docs.steel.dev · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Store one credential per site origin with client.credentials.create, passing the target origin plus a value object holding the login fields (the docs use origin + value with username and password keys)
For sites with TOTP 2FA, also include a TOTP secret key in the value object - Steel generates a valid code on demand and injects it when a TOTP field is detected
Enable injection at session creation: client.sessions.create with the credentials parameter set to an empty object (optionally with a namespace)
Steel detects matching login forms and fills and submits automatically; defaults are autoSubmit true, blurFields true, exactOrigin true
Use namespaces to keep multiple accounts for the same origin (exact-match, no wildcards); unspecified credentials go to the default namespace
Official docs: https://docs.steel.dev/overview/credentials-api/overview
Known gotchas
Injection typically completes within about 2 seconds of reaching the login page - wait before falling back to manual login logic
blurFields blurs each filled field immediately so vision agents and screenshots cannot read the secret
exactOrigin true means injection only happens on the exact origin - subdomains and other hosts will not match unless stored separately
Credentials are envelope-encrypted: each gets a short-lived AES-256-GCM key, wrapped by an org-specific KMS key
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