Feature availability changedfeature-availability
Nearest release: v2.1.281, published 2 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 23 Sep 2026 19:37 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 23 Sep 2026 20:07 UTC.
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3131These have provider-specific differences:
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33* **CLAUDE.md memory**: `CLAUDE.md` files load on every provider. Reading [`AGENTS.md` files](/docs/en/memory#agents-md) as project instructions also requires a session that [fetches feature flags](/docs/en/env-vars#features-that-need-feature-flag-fetching)
3433* **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)
3534* **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
3635* **[Commands](/docs/en/commands#all-commands)**:
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