[DOCS] Quickstart `/login` instruction is misleading/invalid for Cloud Provider users (Bedrock/Vertex/Foundry)

Documentation Type

Unclear/confusing documentation

Documentation Location

https://code.claude.com/docs/en/quickstart

Section/Topic

Step 2: Log in to your account

Current Documentation

"When you start an interactive session with the claude command, you'll need to log in: ``bash /login # Follow the prompts to log in with your account ``"

What's Wrong or Missing?

The Quickstart provides a generic instruction to run /login as the primary method of authentication. however, for users utilizing Cloud Providers (Amazon Bedrock, Google Vertex AI, or Microsoft Foundry), the /login and /logout commands are explicitly disabled.

As noted in docs/en/amazon-bedrock.md: "When using Bedrock, the /login and /logout commands are disabled since authentication is handled through AWS credentials."

New users following the Quickstart with a cloud-provider configuration will attempt to run /login and receive an error or a message stating the command is disabled, leading to a confusing first-time user experience.

Suggested Improvement

Add a "Note" or "Info" callout to Step 2 of the Quickstart to clarify authentication for cloud users.

Suggested Text:

Note for Cloud Provider Users: If you are using Amazon Bedrock, Google Vertex AI, or Microsoft Foundry, authentication is handled via your provider's environment variables and CLI credentials (e.g., aws configure or gcloud auth). For these configurations, the /login and /logout commands are disabled. Please see the [Enterprise Deployment](/en/third-party-integrations) guide for setup details.

Impact

High - Prevents users from using a feature

Additional Context

• Internal Reference: docs/en/amazon-bedrock.md (Section: Setup - Item 3) explicitly mentions: "When using Bedrock, the /login and /logout commands are disabled since authentication is handled through AWS credentials."
• Internal Reference: docs/en/google-vertex-ai.md (Section: Setup - Item 4) notes: "When using Vertex AI, the /login and /logout commands are disabled since authentication is handled through Google Cloud credentials."
• Severity: Major. The Quickstart is the primary entry point for all developers; providing an invalid instruction to enterprise/cloud users causes immediate friction.