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HomeDocsClaude Code CLI 13 Oct 2026
One change · claude-code

Connect Claude Code to tools via MCP changedmcp

Nearest release: v2.1.299, published 20 hours after 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 13 Oct 2026 04:17 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 13 Oct 2026 04:37 UTC.

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First seen 14 Aug 2026 this site's first read of the page
Recorded edits83to this page, all time

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297297If your request needs tools from a server that is still connecting in the background, Claude waits for that server before continuing. How the wait happens depends on your configuration:
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299299* **With [tool search](#scale-with-mcp-tool-search), the default**: the wait happens inside the `ToolSearch` call.
300* **Without tool search**: Claude uses the `WaitForMcpServers` tool instead. Configurations without tool search include a custom `ANTHROPIC_BASE_URL`, `ENABLE_TOOL_SEARCH=false`, and a model earlier than the Claude 4.5 generation on Google Cloud's Agent Platform.
300* **Without tool search**: Claude uses the `WaitForMcpServers` tool instead. Configurations without tool search include a custom `ANTHROPIC_BASE_URL`, `ENABLE_TOOL_SEARCH=false`, and a model earlier than Claude Opus 4.5, Claude Sonnet 4.5, and Claude Haiku 4.5 on Google Cloud's Agent Platform.
301301* **On a Microsoft Foundry [deployment hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#hosting-options)**: Claude starts on the tool-search path rather than with `WaitForMcpServers`, since Claude Code discovers the deployment's server-side rejection only from the API. After Claude Code switches that deployment to [upfront loading](#scale-with-mcp-tool-search), tools from a server that finishes connecting become available on Claude's next request.
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303303With tool search enabled, when a server finishes connecting while Claude is working, Claude Code lists the server's tool names to Claude on its next request in the same turn. Claude can then search for and call those tools without waiting for your next message.
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