What problem does it solve? Turning a finished plugin specification, design, and development plan into a real, installable plugin package is error-prone: code gets written without verification, evidence is missing, and review findings pile up. This Skill executes the plan task by task, running builds, tests, and probes so every completed task is backed by machine evidence. ## Core Features & Use Cases - Plan-Driven Development: Reads PLUGIN-DEV-PLAN.md and Plugin-Project-State.md, picks the next ready task, implements it, and records evidence before marking it done. - Minimal Round-Trip First: Establishes a working UI-to-Agent-to-UI loop with state persistence before building business features. - Fix Mode: Maps reviewer or checker findings to root causes, routes design or spec issues back upstream, and re-runs the original failing scenario plus affected regressions. - Use Case: After plugin-spec-builder and the design phase produce a PLAN_READY development plan, invoke this Skill to build a Claude Code or MCP plugin end to end, generating source, contracts, tests, evidence, and the final installable package. ## Quick Start Continue developing my plugin from the current task in PLUGIN-DEV-PLAN.md and collect evidence for each completed task.