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MVVM Architecture · ledgerhq | DecimalAI

frontendby ledgerhq

MVVM Architecture

ledgerhq/mvvm-architecture

Source ledgerhq/ledger-live ↗License MIT

Plan, review, and develop desktop and mobile app features following our MVVM architectural pattern. Applies to all new .ts and .tsx files within /apps/ledger-live-desktop or /apps/ledger-live-mobile

SkillScore100Maintained

Automatic

Frontend / UI pack

Last verified 8/16/2026

What it changes

Passed 22 of 22 test cases with the skill, and 12 of 22 without it.

Without skill55%

With skill100%

Checks it passed that the model alone missed

Replaces deep relative imports with path aliases.
Names the list workflow screen directory using `List`.
Names the ViewModel hook file `useCryptoSelectorViewModel.ts`.

and 13 more in the full report

10 fixed12 passed either way0 still failing0 broke

Pass-rate lift: +45 pp
Tokens: +1%
Agent turns: 0%
Response time: -45%

Model gemini-3.6-flashMeasured 8/16/2026v122 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/ledgerhq-mvvm-architecture/SKILL.md https://app.decimal.ai/s/ledgerhq-mvvm-architecture/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add ledgerhq-mvvm-architecture, 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/ledgerhq-mvvm-architecture/ and pins it in .decimal/skills.lock

decimalai skills add ledgerhq-mvvm-architecture

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

curl -fsSL --create-dirs -o .claude/skills/ledgerhq-mvvm-architecture/SKILL.md https://app.decimal.ai/s/ledgerhq-mvvm-architecture/SKILL.md

Raw file: /s/ledgerhq-mvvm-architecture/SKILL.md ↗ · machine-readable summary at /s/ledgerhq-mvvm-architecture.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 10

Prompt

A developer is building a token list screen inside `src/mvvm/features/Tokens/screens/TokenList/` for Ledger Live Mobile. Which design system library should be used for mobile UI components?

What was checked, without and with the skill
Checked	Without skill	With skill
Specifies `ldls-native` as the design system library for mobile UI elements.	Missed	Passed

case-12 · gemini-3.6-flash · 8/16/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md91 linessingle file

MVVM Architecture

The new standard for desktop and mobile apps

New code for ledger-live-desktop and ledger-live-mobile must go into src/mvvm/
Eventually no feature code within these apps will live outside of src/mvvm
New features, screens, components, hooks, and utilities belong in src/mvvm/
Code changes with src/mvvm must conform to these mvvm patterns
Code reviews enforce strict adherence

Folder Structure

src/mvvm/
├── features/
│   └── FeatureName/
│       ├── __integrations__/    ← mandatory integration tests
│       ├── components/          ← reusable UI across screens
│       ├── screens/             ← individual screen folders
│       ├── hooks/               ← feature-specific hooks
│       └── utils/               ← feature-scoped utilities
├── components/                  ← global shared UI
├── hooks/
└── utils/

Feature Folder Responsibilities

components/ gathers reusable UI elements across multiple screens.
screens/ contains individual screen folders and their private building blocks.
hooks/ contains feature-specific reusable hooks.
utils/ contains feature-scoped utilities.

Nesting Guidelines

Place elements inside the closest folder matching their reuse scope.
Screen-specific building blocks stay inside the screen folder.
Feature-level components belong to FeatureName/components/.
Global shared UI belongs to src/mvvm/components/.

Track record

Benchmark

22 / 22

test cases passed, vs 12 / 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

ledgerhq / ledger-live

.agents/skills/mvvm-architecture/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

MVVM Architecture

The new standard for desktop and mobile apps

Folder Structure

Feature Folder Responsibilities

Nesting Guidelines

Track record

Benchmark

Adoption

SkillSafety

Source

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