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3333* **MCP servers**: [connectors from claude.ai](/docs/en/mcp#use-mcp-servers-from-claude-ai) load only when your claude.ai subscription is the active authentication method. [Tool search](/docs/en/mcp#configure-tool-search) is off by default when `ANTHROPIC_BASE_URL` points to a non-first-party host, and isn't supported on Google Cloud's Agent Platform models earlier than the Claude 4.5 generation or on Microsoft Foundry [deployments hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#hosting-options)
3434* **Subagents**: the built-in [Explore subagent](/docs/en/sub-agents#built-in-subagents) caps its inherited model at Opus on the Claude API, and inherits the main conversation's model directly on any other provider, including Claude Platform on AWS
3535* **[Commands](/docs/en/commands#all-commands)**:
36 * `/design-sync` and `/import` with its `claude import` subcommand form are unavailable on Amazon Bedrock, Google Cloud's Agent Platform, Microsoft Foundry, and Claude Platform on AWS
36 * `/design-sync` and `/import` with its `claude import` subcommand form are unavailable on Amazon Bedrock, Google Cloud's Agent Platform, Microsoft Foundry, and Claude Platform on AWS, and through a [Claude apps gateway](/docs/en/claude-apps-gateway#availability-and-limitations)
3737 * `/voice` requires a claude.ai account
3838 * `/list-agents` and its alias `/peers` are available only in sessions where [cross-session messaging is enabled](/docs/en/cross-session-messaging#availability)
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