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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 21 Oct 2026
One change · claude-code

Connect to external tools with MCP changedagent-sdk/mcp

Nearest release: v2.1.306, published an hour 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 21 Oct 2026 00:36 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 21 Oct 2026 00:37 UTC.

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149149Servers loaded from [settings files](#from-a-config-file) such as `.mcp.json` or from plugins commonly show `pending` in the init message. When `options.mcpServers` holds a stdio, HTTP, or SSE server, the first turn waits for these pending servers too, up to `MCP_TIMEOUT`. When `options.mcpServers` is empty or holds only SDK servers, the first turn waits up to 2 seconds instead:
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151* **With [tool search](/docs/en/agent-sdk/tool-search), the default**: the wait covers still-pending servers configured with [`alwaysLoad: true`](/docs/en/mcp#exempt-a-server-from-deferral) and not the rest. The rest keep connecting in the background. [Tool availability](/docs/en/mcp#tool-availability) describes how Claude reaches their tools once they connect.
151* **With [tool search](/docs/en/agent-sdk/tool-search), the default**: the wait covers still-pending servers configured with [`alwaysLoad: true`](/docs/en/mcp#exempt-a-server-from-deferral), and servers it leaves out keep connecting in the background. When `ANTHROPIC_BASE_URL` points to a gateway and [`ENABLE_TOOL_SEARCH`](/docs/en/mcp#configure-tool-search) is unset, the wait covers every pending server. For how Claude reaches tools from servers that connect later, see [Tool availability](/docs/en/mcp#tool-availability).
152152* **Without tool search**: the wait covers every pending server. [Configure tool search](/docs/en/agent-sdk/tool-search#configure-tool-search) covers what turns tool search off. If you exclude the `ToolSearch` tool from the session, for example through `disallowedTools`, the session also runs without tool search.
153153 
154154If you set `permissionPromptToolName`, the first turn also waits for that tool's server in every case, up to `MCP_TIMEOUT`.
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