Do Harnesses Actually Work?
"Not vibes. Verified."
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📊 Top Performing Harnesses
⚡ Before vs After — Real Improvements
📈 Impact by Category
🎯 Which Harnesses Should I Use?
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Click an agent type above to see recommendations.
🔬 Methodology
How We Measure Efficacy
- Baseline: Run benchmark WITHOUT harnesses on a production-grade agent → baseline score
- Attach: Enable harnesses in the agent's configuration
- Re-test: Run the SAME benchmark WITH harnesses → enhanced score
- Calculate: Lift = (enhanced − baseline) / baseline × 100
Testing Standards
- All tests use real LLM calls (Claude Sonnet 4.5, claude-sonnet-4-5-20260110)
- Baseline agents are A/A+ grade production agents (81-92 overall scores)
- 15 flagship agents tested across security, context, orchestration, and development specialties
- Every claim is backed by code — test scripts are reproducible
⚠️ Honesty Note: A previous report showed +166% average lift using synthetic 0.00 baselines. That number was mathematically correct but practically misleading — no one deploys a 0.00-baseline agent. We threw those numbers out and retested with A-grade production agents. The +30.6% is honest and verifiable. An honest +30.6% on production agents is worth more than a fake +166% on stubs.
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