
Reading time: Published: 2026.07.03




context engineering · AI agents · prompt systems · evaluation · agent workflow
A context engineering guide for AI agents. Use task briefs, AGENTS.md, scoped Skills, executable references and task evaluations to reduce guessing and rework.

Codex · ChatGPT · Open Source · AI Coding · Token Cost
Can ChatGPT Web reduce Codex token use? Compare codex-chatgpt-web and codex-with-chatgpt, then assess subscription quota, API billing, tool permissions, data exposure, and a safe trial checklist.

Claude Opus · Opus 5.2 · Model Routing · AI Agents · Model Evaluation
Is Opus 5.2 available? Learn to distinguish routing changes from a formal Claude model release with model IDs, fixed evaluations, cost records, and rollback criteria.