{"version":"2.1.323","anchor":"new-notice-for-mcp-tools-temporarily-not-offered-by-their-se","canonical_anchor":"new-notice-for-mcp-tools-temporarily-not-offered-by-their-se","heading":"Claude is told when an MCP server's tools are temporarily unavailable","tier":"notice","area":"MCP","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323\/e\/new-notice-for-mcp-tools-temporarily-not-offered-by-their-se","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323","markdown":"### Claude is told when an MCP server's tools are temporarily unavailable\n\nClaude Code now tells the model which MCP tools their server is not offering right now, so it does not call them until they come back\n\n**What**\n\nMCP servers are outside programs that give Claude Code extra tools. What a server offers can change from one message to the next. Claude Code now has a notice telling the model which tools their server is not offering at the moment.\n\nThose tools stay in the model's list of tools, but calling them will fail. The notice tells the model not to call them until it is told they are available again.\n\n**Why**\n\nThe model should stop calling tools that would only fail, which saves wasted attempts and confusing errors.\n\n- Area: MCP\n- Tier: You'll notice\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}