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HomeDocsClaude Code CLI 21 Oct 2026
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Connect to external tools with MCP changedagent-sdk/mcp

Nearest release: v2.1.306, published 3 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 21 Oct 2026 06:28 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 06:37 UTC.

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First seen 14 Aug 2026 this site's first read of the page
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### Named servers ### Set the first-turn wait yourself ### Make startup wait for servers

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157157* **Otherwise, with [tool search](/docs/en/agent-sdk/tool-search) on, which is the default**: the first turn waits up to 2 seconds, and only for pending servers that set [`alwaysLoad: true`](/docs/en/mcp#exempt-a-server-from-deferral) or that you [named](#named-servers). The rest keep connecting in the background, and Claude [reaches their tools](/docs/en/mcp#tool-availability) once they connect.
158158* **Otherwise, with tool search off**: the first turn waits up to 2 seconds for every pending settings-file and plugin server. Tool search is off when your [`ENABLE_TOOL_SEARCH` value or model](/docs/en/agent-sdk/tool-search#configure-tool-search) turns it off, or when you exclude the `ToolSearch` tool, for example through `disallowedTools`.
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160### Named servers
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160162You name a server by listing any of its tools, such as `mcp__github__list_issues` or `mcp__github__*`, in [`allowedTools`](#allow-mcp-tools) or in a `permissions.allow` rule in the `settings` option. An [`mcp_tool` hook](/docs/en/hooks#mcp-tool-hook-fields) also names the server it calls when you configure it on a prompt-submission, tool-use, permission, subagent, task, elicitation, or worktree event. Before v2.1.284, naming a server had no effect on the first-turn wait.
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164### Set the first-turn wait yourself
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162166To choose the first-turn wait yourself, set `CLAUDE_CODE_MCP_STARTUP_WAIT_MS` in the [`env` option](/docs/en/agent-sdk/configuration#set-environment-variables), for example `CLAUDE_CODE_MCP_STARTUP_WAIT_MS: "5000"`. The first turn then waits up to that many milliseconds for pending settings-file and plugin servers, whether or not tool search is on. The same limit replaces the `MCP_TIMEOUT` wait for the stdio, HTTP, and SSE servers in `options.mcpServers`.
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164168Three waits apply whatever value you set, including `0`:
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168172* **A still-connecting [named server](#named-servers)**: at least up to 2 seconds, so a value below `2000` doesn't shorten its wait.
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170174Set the variable to `0` to skip the wait for every other server. Servers still pending when the wait ends keep connecting in the background. `CLAUDE_CODE_MCP_STARTUP_WAIT_MS` requires Claude Code v2.1.274 or later.
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176### Make startup wait for servers
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172178Two settings make startup itself wait, before Claude Code sends the init message:
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