AI Plugin IndexPrimer MCP vs GitDiagram
Primer MCP and GitDiagram are both design MCP servers. GitDiagram scores higher (100 vs 93 out of 100). GitDiagram has more GitHub stars (18k), and Primer MCP was updated more recently (yesterday). The table compares them side by side.
| Primer MCP | GitDiagram | |
|---|---|---|
| Score | 93 / 100 | 100 / 100 |
| What it does | An MCP server that connects AI tools to the Primer Design System | Architecture diagrams, explanations and Mermaid source for public GitHub repositories. |
| Publisher | Verified: npm:@primer | Verified: gitdiagram.com |
| Grades | Maintenance A, Licence A, Quality A | Maintenance A, Licence A, Quality A |
| npm downloads a week | 7,224 | Not on npm |
| Runs | Local | Remote |
| Works with | Claude Code, Claude Desktop, Cursor, Codex, Gemini CLI, VS Code, Windsurf | Claude Code, Claude Desktop, Cursor, Codex, Gemini CLI, VS Code, Windsurf, ChatGPT |
| GitHub stars | 3,920 | 18,323 |
| Last commit | 20 Oct 2026 | 14 Oct 2026 |
| Licence | MIT | MIT |
| Listed since | 20 Oct 2026 | 19 Oct 2026 |
| Install Primer MCP | Install GitDiagram |
Questions
Is Primer MCP or GitDiagram more popular?
GitDiagram has more GitHub stars: 18,323.
Can I use Primer MCP and GitDiagram together?
Yes. AI assistants can load several MCP servers at once. Install both and the assistant picks the right one for each task.