NEXT ACTION protocol
Every agent response ends in one unambiguous next action
Protocol Agents Markdown OSS
A Markdown block you paste into CLAUDE.md or AGENTS.md: every recommendation-bearing response ends in exactly one of four tags, [DONE], [DECIDE], [HUMAN] or [WAIT], with the options spelled out whenever the decision is yours. No install step. Ends "let me know how you'd like to proceed".