Half of registry-listed MCP servers fail anonymous use

Pennyforge Studio probed 78 registry-listed MCP servers: only 40 (51.3%) completed the full anonymous path (initialize → tools/list → tools/call), while 15 (19.2%) silently require a token or account at call time. Just 9% have adopted the July 28, 2026 protocol revision, and 5 of 71 endpoints died within 48 hours.

• 40 of 78 servers (51.3%) completed the full anonymous path to a tool call
• 15 servers (19.2%) silently require a token, API key or account at tools/call
• Only 7 of 78 servers (9%) adopted the July 28, 2026 MCP revision
• 5 of 71 endpoints (6.4%) went down in 48 hours — a 93.6% survival rate