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Everything Claude Code
50K+ stars | 6K+ forks | 30 contributors | 5 languages supported | Anthropic Hackathon Winner
The performance optimization system for AI agent harnesses. From an Anthropic hackathon winner.
Not just configs. A complete system: skills, instincts, memory optimization, continuous learning, security scanning, and research-first development. Production-ready agents, hooks, commands, rules, and MCP configurations evolved over 10+ months of intensive daily use building real products.
Works across Claude Code, Codex, Cowork, and other AI agent harnesses.
The Guides
This repo is the raw code only. The guides explain everything.
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| Shorthand Guide Setup, foundations, philosophy. Read this first. | Longform Guide Token optimization, memory persistence, evals, parallelization. |
| Topic | What You'll Learn |
|---|---|
| Token Optimization | Model selection, system prompt slimming, background processes |
| Memory Persistence | Hooks that save/load context across sessions automatically |
| Continuous Learning | Auto-extract patterns from sessions into reusable skills |
| Verification Loops | Checkpoint vs continuous evals, grader types, pass@k metrics |
| Parallelization | Git worktrees, cascade method, when to scale instances |
| Subagent Orchestration | The context problem, iterative retrieval pattern |
What's New
v1.8.0 — Harness Performance System (Mar 2026)
- Harness-first release — ECC is now explicitly framed as an agent harness performance system, not just a config pack.
- Hook reliability overhaul — SessionStart root fallback, Stop-phase session summaries, and script-based hooks replacing fragile inline one-liners.
- Hook runtime controls —
ECC_HOOK_PROFILE=minimal|standard|strictandECC_DISABLED_HOOKS=...for runtime gating without editing hook files. - New harness commands —
/harness-audit,/loop-start,/loop-status,/quality-gate,/model-route. - NanoClaw v2 — model routing, skill hot-load, session branch/search/export/compact/metrics.
- Cross-harness parity — behavior tightened across Claude Code, Cursor, OpenCode, and Codex app/CLI.
- 997 internal tests passing — full suite green after hook/runtime refactor and compatibility updates.