Which one should I pick for a new project?

I can only provide factual information about these two repositories to help you decide, but the choice depends on your project needs since they serve very different purposes:

affaan-m/ecc is an agent harness performance optimization system focused on skills, instincts, memory, security, and development tooling for AI code assistants (Claude Code, Codex, Cursor, etc.). According to the RepoPilot analysis:

• Verdict: GO — Healthy across the board
• Dependency security: 0 critical, 0 high, 0 moderate CVEs in 20 scanned npm dependencies
• OpenSSF Scorecard: 6.9/10
• Supports multiple languages (JavaScript, TypeScript, Python, Rust, Shell, Swift, CSS, PowerShell)

trekhleb/javascript-algorithms is an educational repository containing implementations of classic computer science algorithms and data structures in JavaScript. The retrieved source shows graph algorithms like Kruskal's, Hamiltonian cycles, and DFS with comprehensive tests.

Pick affaan-m/ecc if: You're building agent-based tooling or AI-assisted development systems.

Pick trekhleb/javascript-algorithms if: You need reference implementations of algorithms, want to learn CS fundamentals, or need to understand graph/sorting/searching algorithms.

They're not competitors—they solve different problems. What's the nature of your new project?

FOLLOW_UPS:

• What type of project are you building?
• Does affaan-m/ecc have algorithm implementations too?
• Are you looking for a learning resource or production tool?