The Cloud gateway sign-in error message dropped its instructions for CLAUDE_CODE_USE_GATEWAY, ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN
When Claude Code isn't signed in to the Cloud gateway (a routing option for sending requests through a proxy), it shows an error telling you to run /login. That error no longer includes the extra parenthetical note about using CLAUDE_CODE_USE_GATEWAY, ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN as an alternative way to configure access.
The error message is now shorter and points only to /login as the fix, rather than also listing environment-variable alternatives.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
* Fixed every request failing with `400 … Input tag 'advisor_20260301'` when `ANTHROPIC_BASE_URL` points at a proxy or gateway (2.1.275 regression)changelog see the edit
[Cloud sessions](/docs/en/claude-code-on-the-web) always use your subscription credentials. If you set `ANTHROPIC_API_KEY` or `ANTHROPIC_AUTH_TOKEN` in the cloud environment, it doesn't override your subscription credentials.authentication see the edit
The `/login` and `/logout` commands don't sign you into a claude.ai subscription for Claude Platform on AWS. Authentication runs through your AWS credentials or workspace API key.claude-platform-on-aws see the edit
A covered name reads as empty whether or not you have set the variable, and a `:-default` fallback on it is ignored. A provider base URL such as `ANTHROPIC_BASE_URL` still expands, so `"url": "${ANTHROPIC_BASE_URL}/mcp"` works, unless the …mcp see the edit
In a remote server's `url` and `headers`, Claude Code reads credential variables from your environment as empty rather than expanding them. This keeps a project's `.mcp.json` or a plugin from sending your Claude Code or cloud provider cred…mcp see the edit
* Added the `gatewayInternalNetworks` managed setting, letting administrators allow `/login` to a Claude apps gateway on their organization's own public IPv4 blockchangelog see the edit
Anthropic's documentation has since written up /login, on Claude Code changelog.
Fixed a 2.1.265 regression affecting LLM-gateway and proxy setups: the undocumented CLAUDE_CODE_USE_GATEWAY environment variable, previously…