docs-enrich-section

name	docs-enrich-section
description	Use when a documentation section exists but lacks motivation or use-cases — thin sections that show a signature and a toy example but never explain why a reader would choose this API over alternatives.

Enrich a Documentation Section with Motivation and Use-Cases

Overview

A thin section answers what but not why. Readers landing on such a section cannot judge when to use the API or how it fits into the larger picture. This skill turns a thin section into one that answers: what does this return, why does it exist, when is it the right choice, and what does a realistic use look like.

Signals That a Section Needs Enriching

• Shows only a signature + a trivial example (toy type, no realistic scenario)
• No mention of alternatives or when not to use this API
• A reader could not decide between this and the nearest related operation from the section alone
• Opening sentence restates the method name without adding context

Source Research (Do This First)

Before writing a word of prose, read the implementation:

1. Read the source — understand what the method actually does, not just its signature
2. Find the contrast — locate the nearest alternative (e.g. rebind vs toSchema) and understand the exact difference in return type, requirements, and guarantees
3. Find real usage — search the docs and example files for existing uses of this API to anchor your realistic example
4. Identify the gap — ask: "In what situation would a reader need this but not the alternative?" That gap is the motivation.

The Five-Part Expansion Pattern

Replace the thin section with these five parts, in order:

1. Opening sentence

State what the method returns and the one-line rule for when to use it. Lead with the return type and the key constraint that distinguishes it from alternatives.

DynamicSchema#toSchema returns a Schema[DynamicValue] — it stays fully in the dynamic world and requires no bindings. Use it when you have received a DynamicSchema over the wire and need a codec-compatible schema that enforces structural conformance without binding any Scala types.

2. Motivation paragraph

Explain the gap the method fills. Name the scenario where the alternative fails or is impractical. Name the concrete contexts (middleware, gateways, converters, validators) where this method is the right tool.

3. Contrast sentence or table

State explicitly: "Use X when … Use Y instead when …". One sentence is enough if the distinction is clear; a two-row table if the dimensions are multiple.

Situation	Right choice
No Scala types available; need structural validation only	toSchema
Have a BindingResolver; need a fully operational Schema[A]	rebind[A]

4. Signature block

Keep the existing signature block unchanged. Precede it with a bridging sentence ending in :.

5. Realistic example

Replace any toy example (single-field type, no context) with a scenario that could exist in a real application. The scenario should exercise the method's distinguishing behavior — the part that makes it different from the alternative.

Checklist for the example:

• Models a plausible real scenario (gateway, registry, pipeline, validator)
• Uses mdoc:compile-only
• Imports everything it needs
• No hardcoded output comments (// None, // "hello", etc.)
• Preceded by a prose sentence ending in :

Common Mistakes

Mistake	Fix
Motivation paragraph is abstract ("useful in many cases")	Name one concrete scenario. Abstract motivation helps nobody.
Contrast buried at the end	Put it before the signature block, after motivation
Example uses the same toy type as before	Create a new type that reflects the motivated use-case
Prose sentence before code does not end with :	Every sentence immediately before a code fence must end with :
Added output comments to show what expressions return	Delete them — mdoc evaluates and renders output automatically

Verification

After enriching the section, run the mdoc compilation check to ensure all code examples are syntactically correct and type-check:

# Single file:
sbt "docs/mdoc --in <path/to/file.md>"

# Multiple files — repeat --in/--out pairs:
sbt "docs/mdoc --in docs/reference/file1.md --out out/file1.md --in docs/reference/file2.md --out out/file2.md"

Never use bare sbt docs/mdoc without --in — it recompiles all documentation (~90 seconds).

Success criterion: The output contains zero [error] lines. Warnings are acceptable.

If mdoc reports errors: Fix them immediately before marking the enrichment as complete. Do not commit or claim the work is done until all errors are resolved.

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Final Verification

Walk through every item in the sibling CHECKLIST.md before committing. It covers diagnosis, the five-part expansion pattern, content quality, technical accuracy, mandatory compliance gates, bloat avoidance, and commit hygiene.