{"version":"2.1.317","anchor":"deferred-tools-announcement-tracks-servers-that-run-again","canonical_anchor":"deferred-tools-announcement-tracks-servers-that-run-again","heading":"Claude is told when tools from a failed MCP server work again","tier":"notice","area":"MCP","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.317\/e\/deferred-tools-announcement-tracks-servers-that-run-again","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.317","markdown":"### Claude is told when tools from a failed MCP server work again\n\nWhen an MCP server that failed comes back, Claude is told its tools can be called again and an earlier error no longer applies\n\n**What**\n\nMCP servers are outside programs that give Claude extra tools. If a server failed while its tools were listed, Claude was told those tools could not run. Claude Code now tracks tools from servers that have come back. When there are any, it adds a section to its message to Claude saying the earlier error no longer applies and naming the tools Claude can call now.\n\nThis is separate from the existing handling of tools that were hidden and are restored.\n\n**Why**\n\nWithout this, Claude might keep avoiding tools that work again because it still trusts the old error.\n\n- Area: MCP\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}