{"type": "article", "title": "I graded 36 popular MCP servers on agent usability. A third got a D or F", "publisher": "Web Pulse", "url": "https://wpnews.pro/news/i-graded-36-popular-mcp-servers-on-agent-usability-a-third-got-a-d-or-f", "original_source": "https://tengli.dev/posts/mcp-servers-failing-agents.html", "published": "2026-07-22T05:51:50+00:00", "accessed": "2026-07-22", "id": "i-graded-36-popular-mcp-servers-on-agent-usability-a-third-got-a-d-or-f"}