Plan Checker Skill

Overview

Validate plans before execution using goal-backward analysis. Start from the stated goal and verify every requirement has a complete path through the plan to completion. This catches plan-level defects before they waste an entire execution cycle.

Key principle: Plan completeness does not equal goal achievement. A plan can have all tasks filled in, each well-specified, and still miss the goal entirely. The checker validates by working backward from the goal through every requirement to verify complete coverage -- not just that each task looks reasonable in isolation.

The skill operates as a gate between planning and execution, validating across 10 dimensions and issuing a PASS/BLOCK verdict. If issues are found, a bounded revision loop allows up to 3 iterations before proceeding with documented risks (because the cost of continued planning is not zero -- it consumes context, delays execution, and each revision may introduce new issues).

Instructions

Phase 1: LOAD

Load the plan and its context. The checker needs three things: the plan itself, the goal it serves, and the repository rules it must comply with.

Step 1: Identify the plan

Accept the plan from one of these sources (in priority order):