Connect Claude Code to tools via MCP changedmcp
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Upstream edited this page at 2 Oct 2026 14:03 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 2 Oct 2026 14:07 UTC.
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342342### Dynamic tool updates
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344Claude Code supports MCP `list_changed` notifications, allowing MCP servers to dynamically update their available tools, prompts, and resources without requiring you to disconnect and reconnect. When an MCP server sends a `list_changed` notification, Claude Code automatically refreshes the available capabilities from that server.
344An MCP server can change the tools, prompts, or resources it offers while connected and send a `list_changed` notification. When one arrives:
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346* **In an interactive terminal session**, Claude Code fetches the updated list from that server, so you don't need to reconnect it.
347* **In [non-interactive mode](/docs/en/headless) with the `-p` flag and in the [Agent SDK](/docs/en/agent-sdk/overview)**, Claude Code refreshes only the tool list on these notifications.
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346349If a refresh request fails, Claude Code keeps the server's previously discovered tools, prompts, and resources until a later refresh succeeds. Before v2.1.214, a transient error during the refresh replaced the server's tools, prompts, and resources with an empty list.
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