alexandru/scala-kindlings-derivation
skills/scala-kindlings-derivation/SKILL.md
Scala auto-derivation with Kindlings for Circe and PureConfig. Use when replacing circe-generic/circe-generic-extras or PureConfig generic derivation with Kindlings while keeping normal Circe JSON APIs and PureConfig loading/writing APIs.
$ install --global
skillsauthnpx skillsauth add alexandru/skills scala-kindlings-derivationInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: May 30, 2026, 4:21 AM222.2s5 files scanned
SKILL.md
- name:
- scala-kindlings-derivation
- description:
- Scala auto-derivation with Kindlings for Circe and PureConfig. Use when replacing circe-generic/circe-generic-extras or PureConfig generic derivation with Kindlings while keeping normal Circe JSON APIs and PureConfig loading/writing APIs.
Scala Kindlings Derivation
Quick start
- Use Kindlings to derive type class instances; keep using library APIs for actual work.
- Circe: derive
Encoder,Decoder, orCodec.AsObject; keep usingasJson,decode, parsers, printers. - PureConfig: derive
ConfigReader,ConfigWriter, orConfigConvert; keep usingConfigSource.loadand PureConfig writers.
- Circe: derive
- Prefer companion-object instances for root types used at call sites; nested product types are derived as needed.
- Configure derivation with Kindlings config values/hints, not with Circe/PureConfig generic imports.
- Do not import
io.circe.generic.auto._,io.circe.generic.semiauto._,pureconfig.generic.auto._, orpureconfig.generic.semiauto._when using Kindlings.
APIs to reach for
- Circe JSON:
- Use
KindlingsEncoder.derive[A],KindlingsDecoder.derive[A], orKindlingsCodecAsObject.derive[A]. - Cross-platform.
- Default field names are unchanged.
- ADTs are wrapped unless a discriminator is configured.
- Use
- PureConfig HOCON:
- Use
KindlingsConfigReader.derive[A],KindlingsConfigWriter.derive[A], orKindlingsConfigConvert.derive[A]. - JVM-only.
- Defaults match PureConfig: kebab-case keys,
typediscriminator, defaults enabled, unknown keys allowed.
- Use
References
- Load
references/circe-derivation.mdfor Circe derivation, annotations, discriminators, and migration notes. - Load
references/pureconfig-derivation.mdfor PureConfig derivation, default conventions, discriminator configuration, and supportedPureConfigknobs. - Load
references/best-practices.mdfor organization, call-site hygiene, and validation guidance.
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