ruflo-metaharness

MetaHarness integration plugin for ruflo. Surfaces the upstream metaharness / harness / @metaharness/darwin CLIs through eleven ruflo skills, honoring ADR-150's architectural constraint that MetaHarness must remain a removable augmentation — never a required runtime dependency.

ADR-150 architectural constraint (load-bearing)

Ruflo remains operational if every MetaHarness package is removed. Every code path in this plugin satisfies four rules:

Removable — no static import '@metaharness/*' outside the optional-router path in v3/@claude-flow/cli/src/ruvector/neural-router.ts.
Optional in package.json — metaharness is in optionalDependencies, never dependencies.
Graceful degradation — every script catches MODULE_NOT_FOUND/network failure and emits { degraded: true, reason: 'metaharness-not-available' } JSON, exits 0. The graceful path is the default behavior, not a special case.
CI gate — no-metaharness-smoke.yml runs the plugin smoke with npm install --no-optional and asserts the contract still passes.

Skills

Skill	Usage	Description
`harness-score`	`/harness-score [--path .] [--alert-on-fit-below 70]`	5-dim readiness scorecard (harnessFit/compile/coverage/safety/memory + cost)
`harness-genome`	`/harness-genome [--path .] [--alert-on-risk-above 0.5]`	7-section categorical report (repo_type/topology/risk/mcp/test/publish)
`harness-mcp-scan`	`/harness-mcp-scan [--path .] [--fail-on high]`	Static MCP security findings — pure-read, no dispatch
`harness-threat-model`	`/harness-threat-model [--path .] [--fail-on high]`	Enterprise-grade threat model (clean/low/medium/high + findings)
`harness-mint`	`/harness-mint --name <id> --template <id> [--confirm]`	Scaffold a custom harness; DRY-RUN by default; refuses project-root writes
`harness-similarity`	`/harness-similarity --a a.json --b b.json [--per-dimension] [--alert-below 0.5]`	ADR-152 §3.1 weighted similarity between two harness fingerprints (cosine + categorical + jaccard)
`harness-oia-audit`	`/harness-oia-audit [--path .] [--alert-on-worst high] [--dry-run]`	Composite Phase-2 audit (oia-manifest + threat-model + mcp-scan) into `metaharness-audit` namespace
`harness-drift-from-history`	`/harness-drift-from-history [--baseline-since 7d] [--threshold 0.95]`	1-command drift detection — composes audit-list + oia-audit + audit-trend
`harness-bench`	`/harness-bench --op create\|verify --repo <path>`	Manage `@metaharness/darwin` bench suites — fixed evaluation corpora for `harness-evolve`
`harness-evolve`	`/harness-evolve --repo <path> [--generations 3] [--sandbox real\|mock\|agent]`	Run `@metaharness/darwin evolve` — mutate seven policy surfaces, sandbox-score variants, promote measured wins
`harness-security-bench`	`/harness-security-bench [--population 2] [--cycles 1] [--alert-on-fail]`	"Darwin Shield" / ADR-155 — evolve a security-detection harness against a 10-vuln corpus

Phase-0 baseline (ruflo itself, 2026-06-16)

json

{
  "harnessFit": 82,
  "compileConfidence": 100,
  "taskCoverage": 79,
  "toolSafety": 100,
  "memoryUsefulness": 40,
  "estCostPerRunUsd": 0.048,
  "recommendedMode": "CLI + MCP",
  "archetype": "typescript-sdk-harness",
  "template": "vertical:coding",
  "scaffoldReady": true,
  "risk_score": 0.27,
  "publish_readiness": 0.9
}

Architecture

All skills use subprocess invocation through the _harness.mjs shared helper:

skills/X/SKILL.md → scripts/X.mjs → scripts/_harness.mjs → spawnSync('npx', ['metaharness', …])
                                                  ↘ on MODULE_NOT_FOUND → emit degraded JSON, exit 0

This means:

No library import overhead on ruflo's boot path
60s hard timeout per subprocess (bounded blast radius)
--json flag forced for structured parsing
Graceful degradation is a single helper used by every skill

Cross-links

ADR-150 — decision + architectural constraint
Issue #2399 — phase rollout tracker
Research dossier — full graded-evidence sourcing
Upstream — metaharness source
ADR-148/149 — @metaharness/router cost-optimal routing (sibling integration)