AI Plugin IndexGcf vs Harness
Gcf and Harness are both ai and llm tools MCP servers. Harness scores higher (95 vs 87 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.
| Gcf | Harness | |
|---|---|---|
| Score | 87 / 100 | 95 / 100 |
| What it does | The AI-native wire format for structured data. 50-92% fewer tokens than JSON, with multi-turn delta encoding for agent loops. 100% comprehension on every frontier model. Zero dependencies. | Start Claude Code and Codex agents the person can watch, wait for them and read their answers. |
| Publisher | Verified: npm:@blackwell-systems | Verified: harness.autonomous.ai |
| Grades | Maintenance A, Licence A, Quality C | Maintenance A, Licence A, Quality A |
| npm downloads a week | 6,922 | Not on npm |
| Runs | Local | 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 | 4 | 1,320 |
| Last commit | 3 Oct 2026 | 19 Oct 2026 |
| Licence | MIT | MIT |
| Listed since | 20 Oct 2026 | 19 Oct 2026 |
| Install Gcf | Install Harness |
Questions
Is Gcf or Harness more popular?
Harness has more GitHub stars: 1,320.
Can I use Gcf 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.