Codex harness

Everything Fervor AI has published that touches Codex harness — 2 pieces, newest first.

• The OpenAI Agents API Rents You the Codex Harness, and There Is No Version Number On It

  The Agents API versions the model and not the harness, so the layer that decides how your agent behaves is the one layer you cannot pin, reproduce, or diff.

• Briefing · September 11, 2026 · morning

  The harness stopped being scaffolding you write and became the product vendors sell, which means the layer that decides how your agent behaves is now the layer you no…