MCP Registry Drift Panel v1

A longitudinal panel of the official Model Context Protocol (MCP) registry: 120 observations spanning 2026-04-30 to 2026-07-28 (88.6 days), covering the registry as it grew from 3,510 to 18,966 active servers. Each observation records, per server, whether its published descriptor and description changed since the prior observation. Server names and content hashes are pseudonymized with change-preserving HMAC-SHA256 tokens; every temporal finding reproduces from this file. This is the dataset behind the measurement paper "Registry Descriptions Go Stale Unevenly: An 89-Day Measurement of Model Context Protocol Drift, and Why Drift-Ranked Re-Auditing Under-Covers It" (preprint: DOI 10.5281/zenodo.21728370)