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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.211

RefreshMcpTools — Re-sync MCP Server Tool Lists

What

A new built-in tool, RefreshMcpTools, lets Claude re-query tool lists from connected MCP servers and update its available tool set without restarting the session. It reports which tools were added or removed.

Usage
# Refresh all connected servers
RefreshMcpTools

# Refresh a specific server
RefreshMcpTools({ server: "myserver" })
Details
  • Triggers when a device or app comes online after a failed tool call, when expected tools are missing, or when a server's tools look stale after reconnection.
  • Returns per-server status: refreshed (tool list applied), error (previous list kept), or not_connected (server offline — this tool never dials).
  • Reports toolCount, added, and removed for each refreshed server.
  • Only activates when MCP clients are connected; hidden when no servers are configured.
  • Does not re-dial disconnected servers — it only re-reads over existing live connections.
Evidence

Complete new tool definition (search for "RefreshMcpTools")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.211 →