AI Plugin IndexSummer Engine vs Harness
Summer Engine and Harness are both ai and llm tools MCP servers. Harness scores higher (95 vs 86 out of 100). Harness has more GitHub stars (1.3k), and Harness was updated more recently (4 days ago). The table compares them side by side.
| Summer Engine | Harness | |
|---|---|---|
| Score | 86 / 100 | 95 / 100 |
| What it does | The game engine built for AI. Any agent makes a multiplayer game and publishes it. | Start Claude Code and Codex agents the person can watch, wait for them and read their answers. |
| Publisher | Community: summerengine | Verified: harness.autonomous.ai |
| Grades | Maintenance A, Licence A, Quality B | Maintenance A, Licence A, Quality A |
| npm downloads a week | 3,706 | Not on npm |
| Runs | Local and remote | Local |
| Works with | Claude Code, Claude Desktop, Cursor, Codex, Gemini CLI, VS Code, Windsurf | Claude Code, Claude Desktop, Cursor, Codex, Gemini CLI, VS Code, Windsurf |
| GitHub stars | 84 | 1,320 |
| Last commit | 19 Oct 2026 | 19 Oct 2026 |
| Licence | MIT | MIT |
| Listed since | 19 Oct 2026 | 19 Oct 2026 |
| Install Summer Engine | Install Harness |
Questions
Is Summer Engine or Harness more popular?
Harness has more GitHub stars: 1,320.
Can I use Summer Engine and Harness together?
Yes. AI assistants can load several MCP servers at once. Install both and the assistant picks the right one for each task.