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. Sessions live in $THIRD_OPTION_HOME, else ~/.config/third-option, readable only by you. --no-browser prints the link instead of opening it.

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 0.1.0

third-option

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Two modes, one gateway

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