Instructions master

Write English instructions at B1 level: use common words, short sentences, and correct grammar. Keep needed technical terms and explain unfamiliar ones.
Make the full instruction set clear and consistent. Preserve working behavior, scope, and useful exceptions; rewrite the wording as needed.
This skill controls authoring and evaluation when skills disagree. Follow higher-priority instructions and explicit user direction. Use domain sources for domain facts.

Establish the contract

Read the full target and the instructions that apply to it. Identify its audience, scope, priority, and how it is loaded.
Map the rules by meaning before editing: what each rule requires, when it applies, and where rules overlap or conflict. Separate confirmed requirements from assumptions and proposals.
Check related instructions, history, and automated checks when they can affect the decision.
Use context and settled user or project conventions to resolve uncertainty first. Ask about remaining uncertainty before the affected decision; continue independent work while waiting.