# Harness Adapter Compliance Matrix

This matrix is the public onramp for teams that want to use ECC across more
than one coding harness. It turns the cross-harness architecture into a
practical scorecard: what works today, what is instruction-only, what needs an
adapter, and what evidence an operator should collect before trusting a setup.

ECC's durable units stay in shared sources:

- `skills/*/SKILL.md`
- `rules/`
- `commands/`
- `hooks/hooks.json`
- `scripts/hooks/`
- MCP reference configs
- session and observability contracts

Harness-specific files should only adapt loading, event shape, command names,
or platform limits.

## Compliance States

| State | Meaning |
| --- | --- |
| Native | ECC can install or verify the surface directly for this harness. |
| Adapter-backed | ECC has a thin adapter, plugin, or package surface, but parity differs by harness. |
| Instruction-backed | ECC can provide the guidance and files, but the harness does not expose the runtime hook/session surface ECC needs for enforcement. |
| Reference-only | The tool is useful as a design pressure or external runtime, but ECC does not yet ship a direct installer or adapter for it. |

## Matrix

The matrix below is rendered from
`scripts/lib/harness-adapter-compliance.js` and verified by
`npm run harness:adapters -- --check`.

<!-- harness-adapter-compliance:matrix-start -->
| Harness or runtime | State | Supported assets | Unsupported or different surfaces | Install or onramp | Verification command | Risk notes |
| --- | --- | --- | --- | --- | --- | --- |
| Claude Code | Native | Claude plugin assets; skills; commands; hooks; MCP config; local rules; statusline-oriented workflows | Claude-native hooks do not imply parity in other harnesses | `./install.sh --profile minimal --target claude`; Claude plugin install | `npm run harness:audit -- --format json`; `node scripts/session-inspect.js --list-adapters` | Avoid loading every skill by default; keep hooks opt-in and inspectable. |
| Codex | Instruction-backed | `AGENTS.md`; Codex plugin metadata; skills; MCP reference config; command patterns | Native hook enforcement and Claude slash-command semantics are not equivalent | `./install.sh --profile minimal --target codex`; repo-local `AGENTS.md` review | `npm run harness:audit -- --format json` | Treat hooks as policy text unless a native Codex hook surface exists. |
| OpenCode | Adapter-backed | OpenCode package/plugin metadata; shared skills; MCP config; event adapter patterns | Event names, plugin packaging, and command dispatch differ from Claude Code | OpenCode package or plugin surface from this repo | `node tests/scripts/build-opencode.test.js`; `npm run harness:audit -- --format json` | Keep hook logic in shared scripts and adapt only event shape at the edge. |
| Cursor | Adapter-backed | Cursor rules; project-local skills; hook adapter; shared scripts | Cursor hook events and rule loading differ from Claude Code | `./install.sh --profile minimal --target cursor` | `node tests/lib/install-targets.test.js`; `npm run harness:audit -- --format json` | Cursor adapters must preserve existing project rules and avoid silent overwrite. |
| Gemini | Instruction-backed | Gemini project-local instructions; shared skills; rules; compatibility docs | No full ECC hook parity; ecosystem ports must document drift from upstream ECC | `./install.sh --profile minimal --target gemini` | `node tests/lib/install-targets.test.js` | Treat Gemini ports as ecosystem adapters until validated end to end inside Gemini CLI. |
| Zed-adjacent workflows | Instruction-backed | shared skills; `AGENTS.md` style project instructions; verification loops | Zed agent surfaces vary; no first-party ECC installer is shipped today | Manual copy from shared ECC sources until adapter requirements settle | `npm run harness:audit -- --format json` | Do not claim native Zed support before a real adapter and verification path exist. |
| dmux | Adapter-backed | session snapshots; tmux/worktree orchestration status; handoff exports | dmux is an orchestration runtime, not an install target for skills/rules | `node scripts/session-inspect.js --list-adapters`; dmux session target inspection | `node tests/lib/session-adapters.test.js` | Treat dmux events as session/runtime signals, not as a replacement for repo validation. |
| Orca | Reference-only | worktree lifecycle; review state; notification; provider-identity design pressure | No ECC installer or direct adapter today | Use as a comparison target for worktree/session state requirements | `npm run observability:ready` | Do not import product-specific assumptions; convert lessons into ECC event fields. |
| Superset | Reference-only | workspace presets; parallel-agent review loops; worktree isolation design pressure | No ECC installer or direct adapter today | Use as a comparison target for workspace preset taxonomy | `npm run observability:ready` | Keep ECC portable; do not require a desktop workspace to get basic value. |
| Ghast | Reference-only | terminal-native pane grouping; cwd grouping; search; notifications | No ECC installer or direct adapter today | Use as a comparison target for terminal-first session grouping | `node scripts/session-inspect.js --list-adapters` | Preserve terminal ergonomics before adding visual UI assumptions. |
| Terminal-only | Native | skills; rules; commands; scripts; harness audit; observability readiness; handoffs | No external UI, no automatic session control unless scripts are run explicitly | Clone repo; run commands directly; use minimal profile for project installs | `npm run harness:audit -- --format json`; `npm run observability:ready` | This is the fallback contract; every higher-level adapter should degrade to it. |
<!-- harness-adapter-compliance:matrix-end -->

## Scorecard Onramp

Use this sequence before asking ECC to make a team or repo setup more
autonomous:

```bash
npm run harness:adapters -- --check
npm run harness:audit -- --format json
npm run observability:ready
node scripts/session-inspect.js --list-adapters
node scripts/loop-status.js --json --write-dir .ecc/loop-status
```

Read the result as a setup scorecard, not a product badge:

- `harness:adapters -- --check` proves this public matrix still matches the
  adapter source data and required evidence fields.
- `harness:audit` scores tool coverage, context efficiency, quality gates,
  memory persistence, eval coverage, security guardrails, and cost efficiency.
- `observability:ready` proves the repo still exposes the local status,
  session, tool-activity, risk-ledger, and release-onramp signals.
- `session-inspect --list-adapters` shows which session surfaces are actually
  inspectable in the current environment.
- `loop-status --json` creates a machine-readable handoff/status payload for
  longer autonomous runs.

## Data-Backed Scorecard Contract

Each adapter record exposes:

- `id`
- `state`
- `supported_assets`
- `unsupported_surfaces`
- `install_or_onramp`
- `verification_commands`
- `risk_notes`
- `last_verified_at`
- `owner`
- `source_docs`

The validator fails if a public adapter claim has no install path,
verification command, risk note, owner, source doc, or verification date.

## Operating Rules

- Prefer small, additive adapters over harness-specific forks of the same
  workflow.
- Do not call a harness native until the adapter has an install path and a
  verification command.
- Keep Codex, Gemini, and Zed surfaces honest when enforcement is
  instruction-backed rather than runtime-backed.
- Treat reference-only tools as design pressure until ECC has a direct adapter.
- Keep the terminal-only path healthy; it is the portability floor.