https://quenginedev.com/blog Tutorials and architecture notes on systems, agents, and full-stack engineering. en-us https://quenginedev.com/blog/writing-validation-contract-that-catches-bugs https://quenginedev.com/blog/writing-validation-contract-that-catches-bugs Tue, 23 Jun 2026 00:00:00 GMT How to write implementation-agnostic assertions with stable IDs, verification methods, and edge cases—so your mission harness blocks "looks done" handoffs before they ship. https://quenginedev.com/blog/building-multi-agent-harness https://quenginedev.com/blog/building-multi-agent-harness Mon, 22 Jun 2026 00:00:00 GMT A practical tutorial on the mission skill, Orchestrator–Worker–Validator roles, serial execution gates, and the infrastructure harness that keeps multi-agent coding sessions safe and shippable.