Anthropic Shows How to Build a Self-Checking Loop in Claude Code

Anthropic's official developer account @ClaudeDevs published on June 2, 2026 a roughly six-minute video on X showing how to build a self-contained "feedback loop" that lets Claude Code—its CLI coding tool powered by Claude—verify its own work before handing it back and keep fixing until it passes. The approach involves encoding manual verification steps users previously ran by hand—test runs, screenshot comparisons, checklists—as prompts or as Skills/Hooks, so that Claude itself reads the results, iterates, and closes the loop on its own. Source

Claude Code is Anthropic's agentic coding environment that holds an entire project as context and performs file search, editing, and test execution across the codebase via tool calls. With traditional one-shot prompts, the AI often judged a task "done" by appearance and submitted it, only for humans to find bugs afterward. The theme here is replacing that "thought it was done" behavior with mechanical pass/fail judgment.

The official documentation states plainly: "Give Claude a way to check its own work," emphasizing that by providing external pass/fail signals such as tests, builds, and UI verification, Claude can close the loop itself. The best-practices page notes, "Without a check it can run, you become the verification loop," urging users to break free from being chained to manual review. How Claude Code WorksBest Practices