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Hearth Def Caching

Category: Engineering  ·  Sub-category: performance  ·  Last updated:
Canonical recipe for generating type-class instances with cached defs via ValDefsCache. forwardDeclare, buildCachedWith, toValDefs.use, parTuple for parallel derivation. Use when implementing multi-method type class instances or solving Scala 3 sibling-splice isolation.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

This is the canonical recipe for generating type-class instances whose method bodies need to be derived once but referenced from multiple places — including instances with multiple abstract methods, where each method body becomes its own Expr.splice and the splices share no Quotes instance on Scala 3.

What this skill does

Hearth Def Caching is a community-contributed Claude Code skill in the performance sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/hearth-def-caching/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when implementing multi-method type class instances or solving Scala 3 sibling-splice isolation.

Who uses this skill

The Hearth Def Caching Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/hearth-def-caching
curl -L https://claudskills.com/skills/hearth-def-caching/SKILL.md \
  -o ~/.claude/skills/hearth-def-caching/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/hearth-def-caching/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/hearth-def-caching/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\hearth-def-caching\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Hearth Def Caching Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/hearth-def-caching/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Hearth Def Caching skill do?
Canonical recipe for generating type-class instances with cached defs via ValDefsCache. forwardDeclare, buildCachedWith, toValDefs.use, parTuple for parallel derivation. Use when implementing multi-method type class instances or solving Scala 3 sibling-splice isolation.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Hearth Def Caching skill?
Use Hearth Def Caching when your Claude Code task falls under the Engineering category — specifically in the performance area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Hearth Def Caching" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Hearth Def Caching skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Hearth Def Caching is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
kubuszok. (2026). Hearth Def Caching [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/hearth-def-caching/
BibTeX
@misc{hearth-def-caching-2026,
  author    = {kubuszok},
  title     = {Hearth Def Caching [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/hearth-def-caching/}
}

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Security scan

Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.

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