third-option

Signs Claude Code in to a Third Option gateway from anywhere, and keeps the session fresh.

Claude Code's own gateway login accepts only a gateway on a private network: every address the host resolves to must be RFC 1918, CGNAT or loopback, and no setting widens that. A gateway with a public address — a hosted one, or a company's reached without the VPN — has no interactive way in. This is that way in.

Install

cargo install third-option
npm install -g third-option
uv tool install third-option        # or: pipx install third-option

Prebuilt for Linux x64 and arm64 (glibc) and Apple Silicon; cargo install builds anywhere Rust does.

Use

third-option enroll https://gateway.example.com

That opens the gateway's sign-in page, waits for you to confirm the code it printed, then writes Claude Code's settings.json ($CLAUDE_CONFIG_DIR, else ~/.claude) so that:

env.ANTHROPIC_BASE_URL is the gateway and model discovery is on, so the model picker shows what the gateway serves;
apiKeyHelper is third-option token, which prints the session token and renews it through the gateway's refresh grant before it runs out;
whatever the gateway pushes from /managed/settings — model, permissions, the telemetry exporter — is merged in, the operator's keys winning and lists such as permissions.deny unioned;
when telemetry is pushed, otelHeadersHelper is third-option otel-headers, so exports to the gateway carry the session and land.

Nothing else in the file is touched. Run enroll again to pick up a changed policy. third-option status shows the session, when it ends, and what Claude Code points at; third-option models lists what this identity may use.

Verb	Does
`enroll [url]`	sign in if needed, then point Claude Code at the gateway
`login <url>`	sign in only — for a scripted client that sets `ANTHROPIC_BASE_URL` itself
`token`	print a fresh session token (`apiKeyHelper`)
`otel-headers`	print `{"Authorization": "Bearer …"}` (`otelHeadersHelper`)
`status`, `models`, `logout [--all]`

--gateway <url> picks a gateway; otherwise $ANTHROPIC_BASE_URL — which Claude Code sets from the env block when it runs a helper — then the last login. --no-browser prints the link instead of opening it.

Where the session is kept

The session is a credential, so it lives in the OS secure store: the Keychain on macOS, the Secret Service (GNOME Keyring, KWallet) on Linux, the Credential Manager on Windows — service third-option, account the gateway's origin, so it is the entry you see in Keychain Access or Seahorse. macOS asks once per new build of the binary whether it may read its own entry; "Always Allow" is the answer. credentials.json under $THIRD_OPTION_HOME, else ~/.config/third-option, only records which gateways have a session and which was used last.

Where no secure store is reachable — a server with no session bus, a CI runner — login keeps the session in that file instead, readable only by you, and says so. THIRD_OPTION_STORAGE=file chooses the file outright; THIRD_OPTION_STORAGE=keyring refuses the fallback. status shows where each session is.

Two modes, one gateway

	Public — this CLI	Private network — Claude Code's own login
Reaches the gateway over	any TLS route	private addresses only
Enrollment	`third-option enroll`	`/login`, pinned by a machine policy file
Credential	`apiKeyHelper`	the pinned gateway session
Managed settings	merged into your `settings.json` by `enroll`	pushed live, not editable
Telemetry	signed by `otelHeadersHelper`	signed by the session

They are exclusive on one machine: the policy file that turns on Claude Code's own gateway login (/etc/claude-code/managed-settings.json; /Library/Application Support/ClaudeCode/ on macOS) makes it refuse every helper credential. enroll and status say so when they see one. The private-network mode is the stronger one, so a fleet on its own network should use it; this CLI is for everyone else.

Scripted use

export ANTHROPIC_BASE_URL=https://gateway.example.com
export ANTHROPIC_AUTH_TOKEN="$(third-option token)"

token renews the session when it has under fifteen minutes left, so a long-running script can call it again rather than cache the value.

License

MIT OR Apache-2.0.

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third-option 0.2.0

third-option

Install

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Where the session is kept

Two modes, one gateway

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