{"version":"2.1.314","anchor":"mcp-tool-use-error-telemetry-unreachable-warning","canonical_anchor":"mcp-tool-use-error-telemetry-unreachable-warning","heading":"Claude Code records when an MCP server cannot be reached during a tool call","tier":"internal","area":"MCP","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.314\/e\/mcp-tool-use-error-telemetry-unreachable-warning","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.314","markdown":"### Claude Code records when an MCP server cannot be reached during a tool call\n\nWhen an MCP tool call fails because the server behind it cannot be reached, Claude Code now logs a warning\n\n**What**\n\nMCP servers are outside programs that give Claude extra tools. When a call to one of these tools fails because the server behind it cannot be reached, Claude Code now logs a warning for its usage data. Claude Code also now marks a tool call as running when it starts it.\n\n**Why**\n\nThis is for usage data only and does not change what you see.\n\n- Area: MCP\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}