What problem does it solve? Planning documents written for humans are often too long and unstructured for AI agents to consume efficiently, causing context bloat and lost work during multi-phase implementations. This Skill produces token-efficient PRDs, phased implementation plans, and progress trackers with consistent frontmatter, subagent assignments, and lifecycle status management. ## Core Features & Use Cases - PRD and Plan Generation: Create PRDs from feature requests and expand them into phased implementation plans with subagent routing, estimation heuristics, and tier-based workflow selection. - Plan Optimization: Break plans longer than 800 lines into phase-specific files with progressive disclosure, reducing token usage by 50-70%. - Lifecycle and Exploration Workflows: Track plan status (draft to completed), run pre-commitment exploration charters with feasibility verdicts, and capture deferred items and in-flight findings. - Use Case: A team lead asks for an implementation plan for a new filtering feature; the Skill classifies the tier, generates the PRD, produces an 8-phase plan with subagent assignments, and splits oversized phases into linked files. ## Quick Start Ask the agent to create a PRD for your feature, for example: create a PRD for advanced filtering on the prompts page.