Agent Loops Need Real Evals and Feedback

Melvin Vivas · X post · 2026-08-19 · Open on X

Topics: Evaluation (Evals) & Testing, AI Agents, Tool Use & MCP · Level: intermediate

Summary

A short lesson: autonomous coding loops are just automated vibe coding unless you fix the evals and feedback loop. Agent loops are only as good as the signals that tell them whether they succeeded.

Key points

• Without good evals, an agent loop just repeats unchecked guesses.
• Spend effort on feedback signals (tests, evals) before scaling up loops.
• Evals are what turn vibe coding into a reliable engineering process.

Try this

• Set up evals and feedback checks before relying on automated agent loops.