What problem does it solve? Multi-stage agent workflows often stall or produce inconsistent results because stage readiness, required evidence, and handoff conditions are unclear. This Skill makes each workflow stage executable and auditable by checking the StageContextPackage, required inputs, output contracts, allowed actions, and blockers before any work proceeds. ## Core Features & Use Cases - Stage Readiness Validation: Verifies that required evidence is present, fresh, and trusted before an agent starts or completes a stage. - Evidence Envelope Production: Returns a typed evidence envelope with used evidence, assumptions, blockers, confidence, and handoff information. - Decision Gating: Distinguishes low-risk questions (resolved with documented defaults) from high-risk ones that require a decision-gated question. - Use Case: An agent assigned to a coding stage in a Multica workflow runs this contract check first, discovers a missing test-results evidence key, and returns a precise blocker naming the expected producer stage instead of guessing. ## Quick Start Check whether the current workflow stage is ready to execute and return the evidence envelope or blockers for this stage.