{"version":"2.1.268","anchor":"mcp-tool-list-telemetry-now-tracks-description-length-stats","canonical_anchor":"mcp-tool-list-telemetry-now-tracks-description-length-stats","heading":"MCP tool-list telemetry now tracks description length stats","tier":"internal","area":"MCP","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.268\/e\/mcp-tool-list-telemetry-now-tracks-description-length-stats","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.268","markdown":"### MCP tool-list telemetry now tracks description length stats\n\nMCP tool-list telemetry now reports total, max, mean, and over-limit counts for tool description lengths\n\n**What**\n\nThe `tengu_mcp_tools_listed` telemetry event, sent when Claude Code lists tools from an MCP server, now includes four new fields about the length of tool descriptions returned by that server: `descriptionTotalLength`, `descriptionMaxLength`, `descriptionMeanLength`, and `descriptionOverLimitCount` (how many descriptions exceed a configured size limit).\n\n**Why**\n\nThis gives visibility into how verbose an MCP server's tool descriptions are, which can help identify servers whose overly long descriptions might affect performance or context usage.\n\n- Area: MCP\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5"}