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SwiftData Skills — measured AI agent skill | DecimalAI

rshankras/swiftdata

NewSkillScoreMaintained

SwiftData skills — class inheritance patterns for hierarchical models, type-based querying, polymorphic relationships, and inheritance-vs-enum decisions. Use when designing SwiftData model hierarchies.

codingby rshankras

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Coding pack

1 · One-time — install the CLI (docs ↗)

pip install decimalai

2 · Get the skill — writes .claude/skills/rshankras-swiftdata/SKILL.md

decimalai skills pull rshankras-swiftdata --out .claude/skills/

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/rshankras-swiftdata/SKILL.md https://app.decimal.ai/s/rshankras-swiftdata/SKILL.md

Raw file: /s/rshankras-swiftdata/SKILL.md ↗ · machine-readable summary at /s/rshankras-swiftdata.json ↗

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

22 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 7h ago

No — -5% lift-4% tokens0% turns18% of whole cases pass with skill (4/22)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-14	✓→✗	▼ Worse	-8%	0%
case-03	✓→✓	＝ Same ✓	4%	0%
case-20	✓→✓	＝ Same ✓	2%	0%
case-21	✓→✓	＝ Same ✓	-22%	0%
case-22	✓→✓	＝ Same ✓	-10%	0%

Showing 5 of 22 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

rshankras / claude-code-apple-skills

skills/swiftdata/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

Skill contents

SKILL.md

SwiftData Skills

SwiftData modeling patterns beyond the basics.

When This Skill Activates

Use this skill when the user:

Designs hierarchical SwiftData models (class inheritance)
Needs type-based or polymorphic queries
Weighs inheritance vs enum for model variants

Available Skills

Paths are relative to THIS file's directory — skills run with cwd set to the user's project, so resolve each path from this SKILL.md's own location.

| Skill | Read | Covers | |-------|------|--------| | inheritance | inheritance/SKILL.md | Class inheritance, polymorphic relationships, type-based querying, inheritance-vs-enum |

How to Route

Read inheritance/SKILL.md (relative to this file) plus any reference files it lists.
Apply the guidance to the user's code. For broader macOS SwiftData architecture, see also ../macos/swiftdata-architecture/SKILL.md.

Want to see if rshankras/swiftdata would activate on your phrasing? Try it before you install — no LLM call, no signup.

Other measured skills in the registry, with their headline benchmark lift.