ECC — agent harness performance optimization system
MIT-licensed 'agent harness operating system': 71 agents, 311 skills, hooks, rules, memory and AgentShield security scanning for Claude Code, Codex, OpenCode, Cursor and more, installed via one guided installer.
Why it matters
The largest agent-harness project on GitHub (281k stars, 42k forks), maintained by a single maintainer shipping weekly across 7 harnesses; ECC 2.2 adds a guided multi-harness installer (Claude Code, Codex, Kimi Code), native Antigravity 2.0 support, and a signed-release pipeline.
What you could build with it
A consultancy running Claude Code across client teams could standardize on ECC as the shared harness: one guided install gives every engineer the same plan-test-implement-review-verify workflow, persistent memory, and AgentShield scanning, instead of each team hand-rolling its own agent configuration.
Does it hold up?
Widely installed and battle-tested by the community (281k stars, active Discord, weekly releases, npm + GitHub App distribution). Security surface is broad by design (hooks, MCP configs) — the project ships an explicit 'official sources only' warning against unofficial mirrors.
Built with ECC
- Agent Harness ECC Tops 228K Stars: Free Tool Turns Claude Code Into a Full Dev TeamTech Times · July 2026 profile of creator Affaan Mustafa's hackathon-winning Claude Code config system — 228k stars then vs 281k now, i.e. ~53k stars in three months, the velocity behind today's #2 trending spot.
- ECC directory listing on There's An AI For Thatdirectory · Directory profile cataloguing ECC's 261-skill system and the maintainer's install/usage thread, showing the project's community footprint beyond GitHub.
- agenticluke/agent-wallet-guard-plusgithub · Claude Code skill for safe AI wallet/trade agents, explicitly 'Built on affaan-m/ECC' — shows the harness being repackaged into domain-specific skills.
Learn more
First spotted on github: source.
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