ECC — Everything Claude Code Agent Harness

Source: affaan-m/ECC (MIT) — runtime configuration harness for AI coding agents

What ECC Is

A drop-in configuration layer for Claude Code (and Codex, Cursor, Gemini CLI, Zed, Copilot). It does not modify the model — it wraps the agent runtime with:

• Reusable skills (declarative SKILL.md docs auto-loaded into context)
• Hook automations (shell scripts on PreToolUse, PostToolUse, SessionStart, Stop)
• Rules (always-active guidelines injected every session)
• Memory (persistent facts across sessions)
• Model routing (send simple tasks to cheap model, complex to power model)

Directory Layout

.claude/
  skills/          ← declarative "when/how to use" docs
  hooks/           ← trigger-based shell scripts
  rules/           ← always-active session guidelines
  memory/          ← persistent facts
  settings.json    ← hook registration + model routing

Hook Profile Gating

# Control hook strictness without editing files
export ECC_HOOK_PROFILE=minimal    # only safety hooks
export ECC_HOOK_PROFILE=standard   # standard set (default)
export ECC_HOOK_PROFILE=strict     # all hooks, max enforcement

# In hook scripts — check profile:
[[ "${ECC_HOOK_PROFILE:-standard}" == "minimal" ]] && exit 0

Key Built-in Commands

/learn           — persist lesson to session memory after solving hard problem
/harness-audit   — audit active hooks + skills, detect drift
/loop-start      — begin autonomous multi-turn iteration loop
/loop-status     — check loop progress and quality gate results
/quality-gate    — enforce coding standards + test coverage + security before commit
/model-route     — route task to cheapest capable model by complexity score

Model Routing Pattern

// .claude/settings.json
{
  "modelRouting": {
    "simple": "claude-haiku-4-5",
    "standard": "claude-sonnet-4-6",
    "complex": "claude-opus-4-8",
    "thresholds": {
      "simple_max_tokens": 200,
      "complex_min_tokens": 800
    }
  }
}

Skill Registration Pattern

---
name: my-skill
triggers:
  - "phrase that activates this skill"
do_not_use_for:
  - "overlapping use case — use other-skill instead"
---
# My Skill
...content...

Yana AI Overlap

Yana AI already implements the ECC pattern natively. Use this skill when:

• Referencing ECC-specific commands (/harness-audit, /quality-gate)
• Adapting ECC patterns from the affaan-m repo into Yana AI
• Comparing Yana AI's hook system against ECC's ECC_HOOK_PROFILE model