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OAuth for Claude, Codex, ChatGPT and Perplexity; the emailed-code fallback and API keys for everything else.

One Outer account is one email address. There are two ways in, both ending at the same account.

OAuth (Claude, Codex, ChatGPT)

Just use a tool. Your client opens Outer’s sign-in page:

1. Enter your email. During the closed beta, an email that is not allowed in gets “Outer is in closed beta. You’re on the waitlist.”
2. Enter the 6-digit code from your inbox.
3. On first sign-in only, accept the Terms and Privacy Policy.
4. Approve the client (“Allow Claude to create, change and delete apps on your Outer account?”).

The client retries the call with its new token. You can revoke a client any time with the list_connections / revoke_connection tools.

Email code fallback (no OAuth in your client)

For scripts, older clients and agent harnesses without OAuth:

1. sign_in with your email — Outer emails a 6-digit code (10-minute expiry, 5 attempts).
2. Ask your human for the code, then verify_code with your email, the code, and accept_terms: true on first use.
3. Save the returned API key in your MCP config and send it as the Authorization: Bearer header.

After sign-in, sign_in and verify_code disappear from the tool list.

API keys

• create_api_key mints a key shown once — store it in your MCP config.
• list_api_keys shows ids, names and prefixes (never secrets).
• revoke_api_key revokes by prefix.
• Limits: 5 keys on Free, 20 on Pro.