Workflow Builder — scaffold a Claude Workflow script

Counterpart to skill-builder. skill-builder authors a SKILL.md (a leaf capability); this authors a Workflow (a composite capability — deterministic orchestration of subagents). Reach this skill via automation-shape-routing once the shape is confirmed Workflow (deterministic DAG + structured-JSON returns + headless). If the shape is NTM or plain skill, you're in the wrong builder — go back to automation-shape-routing.

Confirm the shape first

Do NOT scaffold a workflow for: an attach-and-steer run (→ NTM: ntm / vibing-with-ntm), or a hard-sequential edit-loop with no parallelism (→ plain skill: skill-builder). If unconfirmed, run automation-shape-routing.

The template

Start from .claude/workflows/operating-loop.js — the canonical worked example. Copy its skeleton, don't reinvent it. A Workflow script is plain JS: