How to Scope Codex Tasks Without Fragmenting the Work

The decision behind the technique

One giant request accumulates irrelevant context and makes failures expensive. Dozens of tiny prompts create coordination overhead and lose the original acceptance criteria.

Good task boundaries end in evidence: a map, a decision, a working change or a verified result.

A practical step-by-step workflow

Use this sequence as a default, then tighten or expand it only when the evidence changes.

• Write one outcome and its acceptance tests
• Separate exploration, implementation and verification
• Give each stage a concrete deliverable
• Carry forward only decisions and evidence needed by the next stage

Failure boundary and finish line

Do not split a tightly coupled migration across agents that will edit the same state concurrently.

Finish when the next action, owner, evidence and stop condition are all explicit.