# ECC: The Agent Harness Operating System

> Plan artifact · generated by `/ecc:plan` · review in Plan Canvas, then approve to begin

## What ECC installs into your agent

Your agent can already write code. ECC gives it an engineering system: it plans
before it builds, verifies with tests, reviews its own work from a fresh context,
and turns repeated wins into reusable skills.

```mermaid
flowchart LR
  P[Plan] --> T[Test first] --> I[Implement] --> R[Review] --> V[Verify]
  V --> M[Remember] --> S[Improve skills] -.-> P
  style P fill:#6885e8,color:#fff
  style V fill:#6885e8,color:#fff
```

## How the pieces fit

| Concept | What it does | Context behavior |
|---|---|---|
| Skills | Reusable workflows: TDD, security review, deep research | Loaded when the task needs them |
| Agents | Scoped workers with their own context and tool permissions | Isolate planning, implementation, review |
| Rules | Durable project or language standards | Always loaded, so install selectively |
| Hooks | Scripts triggered by harness events | Run outside the model context |
| Instincts | Patterns learned from real sessions | Recalled when relevant |

```mermaid
flowchart TB
  subgraph Harness["Any harness: Claude Code · Codex · Kimi · Cursor · OpenCode"]
    A[Your agent]
  end
  subgraph ECC["ECC"]
    SK[279 skills] --- AG[67 agents]
    RU[Rules] --- HO[Hooks]
    ME[Memory + instincts] --- AS[AgentShield]
  end
  A --> SK
  A --> AG
```

## The review gate you are using right now

`/plan` ends with a hard confirmation gate. Plan Canvas moves that gate from a
wall of terminal markdown to this page. Point at the part you mean, annotate
it, and approve from here.

```mermaid
sequenceDiagram
  participant U as You (browser)
  participant C as Plan Canvas
  participant A as Agent (terminal)
  A->>C: open plan-canvas-demo.plan.md
  U->>C: annotate "Split phase 2"
  C->>A: feedback JSON
  A->>C: revised plan (live-reload)
  U->>C: Approve plan
  C->>A: verdict: approve
  A->>A: begin implementation
```

## Rollout tasks

- [x] Plan Canvas: annotate, chat, approve from the browser
- [x] Kimi Code install target with Moonshot AI
- [x] Verified self-host path on Itô GPUs
- [ ] Ship ECC 2.1 release + announcement
- [x] Demo video (you are watching it)

## Risks

| Risk | Mitigation |
|---|---|
| Plans reviewed as walls of text get skimmed | Canvas renders diagrams + anchored annotations |
| Same context writes and reviews code | Fresh-context reviewer agents |
| Harness config trusted by default | AgentShield scans the harness itself |