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App Extensions Generator · rshankras | DecimalAI

codingby rshankras

App Extensions Generator

rshankras/app-extensions

Source rshankras/claude-code-apple-skills ↗License MIT

Generates app extension infrastructure for Share Extensions, Action Extensions, Keyboard Extensions, and Safari Web Extensions with data sharing via App Groups.

SkillScore68Maintained

Automatic

Coding pack

Last verified 8/17/2026

What it changes

Passed 15 of 22 test cases with the skill, and 13 of 22 without it.

Without skill59%

With skill68%

Checks it passed that the model alone missed

States that content scripts have a memory limit of approximately 6 MB
States that keyboard extensions have a memory ceiling of approximately 48 MB

2 fixed13 passed either way7 still failing0 broke

Pass-rate lift: +9 pp
Tokens: +85%
Agent turns: 0%
Response time: -20%

Model gemini-3.6-flashMeasured 8/17/2026v115 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

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

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add rshankras-app-extensions, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

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

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/rshankras-app-extensions/ and pins it in .decimal/skills.lock

decimalai skills add rshankras-app-extensions

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

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

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

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 2

Prompt

What memory footprint restriction applies specifically to Safari Web Extension content scripts in browser web processes?

What was checked, without and with the skill
Checked	Without skill	With skill
States that content scripts have a memory limit of approximately 6 MB	Missed	Passed

case-16 · gemini-3.6-flash · 8/17/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md262 linessingle file

App Extensions Generator

Generate production app extension infrastructure -- Share Extensions for receiving content from other apps, Action Extensions for manipulating content in-place, Keyboard Extensions for custom input, and Safari Web Extensions for browser integration. Includes App Group data sharing between the host app and extensions.

When This Skill Activates

Use this skill when the user:

Asks to "add a share extension" or "share sheet extension"
Wants to "receive content from other apps" or "accept shared content"
Mentions "action extension" or "content manipulation extension"
Wants to "add a custom keyboard" or "keyboard extension"
Asks about "Safari extension" or "Safari web extension"
Mentions "app extension" or "extension target" generically
Wants to "share data between app and extension" or "App Groups"

Pre-Generation Checks

1. Project Context Detection

Check deployment target (iOS 16+ / macOS 13+)
Check Swift version (requires Swift 5.9+)
Identify project structure (find .xcodeproj or Package.swift)
Identify source file locations

2. Existing Extension Detection

Search for existing extension targets:

Glob: **/*Extension*/*.swift, **/*Extension*/Info.plist
Grep: "NSExtensionPointIdentifier" or "NSExtensionPrincipalClass"

If existing extensions found:

Ask if user wants to add another or modify existing
Identify existing App Groups configuration

3. App Groups Detection

Check for existing App Groups setup:

Glob: **/*.entitlements
Grep: "com.apple.security.application-groups"

Track record

Benchmark

15 / 22

test cases passed, vs 13 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

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

View 15 scanner checks

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/generators/app-extensions/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

App Extensions Generator

When This Skill Activates

Pre-Generation Checks

1. Project Context Detection

2. Existing Extension Detection

3. App Groups Detection

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills