plan-tree

Incrementally builds a recursive tree of implementation-plan files under docs/plans/<root-topic>/, one node at a time, fully user-paced. Each node's plan is produced by an internal Claude<->Codex cross-review and written in the full gen-plan format (Goal, Acceptance Criteria with TDD tests, Path Boundaries, Feasibility Hints, Dependencies, Task Breakdown, Claude-Codex Deliberation, Pending User Decisions). A node can be generated from a spec/design file of any text format, a draft co-written in discussion, or pure discussion with no file. The root stays high-level; detail lives in children. There is no loop, no Stop hook, no cron, no budget, no auto-progression -- the user pushes each step. Use to grow a structured plan hierarchy where every node is independently cross-reviewed. Triggers on "plan tree", "plan-tree", "build a plan tree", "decompose this plan into sub-plans", "add a sub-plan", "grow the plan tree", or requests to recursively break a design into cross-reviewed plan files.