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

Plan Canvas: annotate, chat, approve from the browser
Kimi Code install target with Moonshot AI
Verified self-host path on Itô GPUs
Ship ECC 2.1 release + announcement
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