Read a free-form source summary plus the preceding Galaxy interface brief and emit a reviewable Markdown data-flow brief. Capture abstract operations, collection map/reduce choices, shape-changing placeholder transformations, unresolved Galaxy tool needs, confidence, and open questions.
Free-form sources rarely give enough to fix exact operations. Translate what the summary and interface brief support, classify the rest as unresolved tool needs or open questions, and do not present narrative intent as already-decided Galaxy wiring.
The output is not gxformat2 and should not resolve exact Tool Shed tools. freeform-summary-to-galaxy-template turns this handoff and the interface brief into a skeleton.