What problem does it solve? When working outside a documentation-driven keel project, ad-hoc development often lacks acceptance criteria, test discipline, and review rigor. This Skill turns a plan document, task description, or issue text into a governed development run with explicit contracts, red-green testing, and evidence-based delivery. ## Core Features & Use Cases - Execution Contract Gate: Negotiates a YAML execution contract (scope, expected behavior, evidence plan, stop conditions) before any implementation begins. - Red-Green Enforcement: Requires failing tests before implementation, freezes tests during implementation, and declares degraded evidence when automated testing is infeasible instead of faking TDD. - Fresh-Context Verification: Dispatches a new-context sub-agent to independently verify diff-to-contract compliance, with out-of-contract findings deferred rather than silently fixed. - Batch Mode: Processes Markdown checklist plans item by item, each with fresh context, independent gates, atomic commits, and resumable progress. - Use Case: You receive a GitHub issue describing a bug in a project with no keel documentation. Provide the issue text, confirm the generated execution contract, and receive tested code plus a delivery report with evidence for each contracted behavior. ## Quick Start Ask the agent to implement the task described in your issue text or plan document using dev-flow, then confirm the proposed execution contract to begin development.