Your coding agent doesn't always follow your rules — Talha Sheikh, Checkout.com
Jul 8, 2026 · 10:08
Talha Sheikh from Checkout.com argues that the real value in AI coding agents lies not in the code they generate but in the verification layer that checks it. Drawing from his experience with Claude Code, he built Vector Harness—a tool using Claude hooks to deterministically test agent outputs against a config file, retrying failures automatically. He contends that model capability does not equal reliability, and that even with better specs or models, deterministic verification is essential. Sheikh observes that Anthropic, OpenAI, and CUDO are all adopting similar harness patterns, shifting the focus from instructing agents to enforcing rules. His central claim: work on the harness, not the code, and you can even use smaller, cheaper models with enough guardrails.
