harness-engineering
by Roy Yuen
Design, debug, and harden AI control loops with explicit contracts and automated verification harnesses.
- Implement Plan-Execute-Verify loops for reliable multi-step agent tasks.
- Generate adversarial test suites to harden AI safety gates and prompts.
- Create stateful regression harnesses using the harness-engineering CLI.
$8
One-time purchase · Own forever
Included in download
- Implement Plan-Execute-Verify loops for reliable multi-step agent tasks.
- Generate adversarial test suites to harden AI safety gates and prompts.
- terminal, file_read, file_write automation included
- Includes example output and usage patterns
See it in action
CONTRACT VERIFIED: Loop escape prevented. [REPLAY] fixture_adversarial_04: PASSED [REPORT] - Safety Gate: Verified (Role: Critic) - Output Schema: Verified (Strict) - State Isolation: Inferred Residual Risk: Low. The recovery path for tool timeout remains Unknown in high-latency scenarios.
harness-engineering
by Roy Yuen
Design, debug, and harden AI control loops with explicit contracts and automated verification harnesses.
$8
One-time purchase · Own forever
⚡ Also available via Agensi Pro — your AI agent can load this skill on demand via MCP. Learn more →
Included in download
- Implement Plan-Execute-Verify loops for reliable multi-step agent tasks.
- Generate adversarial test suites to harden AI safety gates and prompts.
- terminal, file_read, file_write automation included
- Includes example output and usage patterns
- Instant install
See it in action
CONTRACT VERIFIED: Loop escape prevented. [REPLAY] fixture_adversarial_04: PASSED [REPORT] - Safety Gate: Verified (Role: Critic) - Output Schema: Verified (Strict) - State Isolation: Inferred Residual Risk: Low. The recovery path for tool timeout remains Unknown in high-latency scenarios.
About This Skill
Advanced AI Control and Testing Framework
The Harness Engineering skill provides a professional-grade toolkit for developers building agentic workflows, LLM control loops, and autonomous systems. It solves the "black box" problem by implementing explicit execution contracts, multi-role orchestration (Planner/Executor/Verifier), and rigorous regression testing pipelines.
What it does
This skill transforms a standard AI agent into a precision engineering tool capable of:
- Defining Control Contracts: Locking down input/output invariants and authority boundaries before execution starts.
- Multi-Pass Orchestration: Managing complex Plan-Execute-Verify-Recover loops with stateful memory and tool budgets.
- Automated Verification: Using a dedicated CLI to run golden fixtures, replay traces, and inject adversarial tests.
- Evidence-Backed Reporting: Generating structured reports categorized by "Verified," "Inferred," or "Unknown" confidence levels.
Why use this skill?
Prompting an AI is easy; keeping it on the rails in production is hard. This skill provides a structured CLI companion and a set of Validation Ladders that ensure your agent doesn't skip safety gates or hallucinate success. It’s built for developers who need to harden their agent orchestration against edge cases and state drift.
Supported Workflows
Supports sophisticated agent patterns including deep reasoning loops, safety gates, trace capture for debugging, and automated scorecard generation for AI performance benchmarking.
The zip bundle included harness-engineering CLI📖 Learn more: Best Testing & QA Skills for Claude Code →
Use Cases
- Implement Plan-Execute-Verify loops for reliable multi-step agent tasks.
- Generate adversarial test suites to harden AI safety gates and prompts.
- Create stateful regression harnesses using the harness-engineering CLI.
- Enforce explicit authority boundaries and contracts between agent sub-roles.
- Capture and replay execution traces to debug non-deterministic AI behavior.
How to Install
unzip harness-engineering-1.zip -d ~/.claude/skills/Reviews
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