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MVVM Pattern for .NET · managedcode | DecimalAI

codingby managedcode

MVVM Pattern for .NET

managedcode/mvvm

Source managedcode/dotnet-skills ↗License MIT

Implement the Model-View-ViewModel pattern in .NET applications with proper separation of concerns, data binding, commands, and testable ViewModels using MVVM Toolkit. USE FOR: implementing UI separation with Model-View-ViewModel; using MVVM Toolkit (CommunityToolkit.Mvvm) for ViewModels; designing testable UI architecture. DO NOT USE FOR: unrelated stacks; generic tasks that do not need this specific guidance. INVOKES: inspect the repository context, edit targeted files, and run relevant build,

SkillScore91Maintained

Automatic

Frontend / UI pack

Last verified 8/19/2026

What it changes

Passed 20 of 22 test cases with the skill, and 19 of 22 without it.

Without skill86%

With skill91%

Checks it passed that the model alone missed

Uses x:Bind syntax for data binding
Executes LoadCommand on the ViewModel instance

2 fixed18 passed either way1 still failing1 broke

Pass-rate lift: +5 pp
Tokens: +94%
Agent turns: 0%
Response time: -27%

Model gemini-3.6-flashMeasured 8/19/2026v120 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/managedcode-mvvm/SKILL.md https://app.decimal.ai/s/managedcode-mvvm/SKILL.md

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

decimalai skills add managedcode-mvvm

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

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

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

Write a XAML snippet for a page displaying a list of products and a refresh button, using high-performance compiled bindings referencing a ProductListViewModel.

What was checked, without and with the skill
Checked	Without skill	With skill
Uses x:Bind syntax for data binding	Missed	Passed
Binds button interaction to ViewModel command properties	Passed	Passed

case-10 · gemini-3.6-flash · 8/19/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md371 lines3 files

MVVM Pattern for .NET

Trigger On

implementing UI separation with Model-View-ViewModel
using MVVM Toolkit (CommunityToolkit.Mvvm) for ViewModels
designing testable UI architecture
handling commands, property changes, and messaging
choosing between MVVM frameworks

Documentation

References

See detailed examples in the references/ folder:

patterns.md — ViewModel, command, navigation, and state patterns
anti-patterns.md — Common mistakes and how to fix them

Core Concepts

Component	Responsibility	Example
Model	Business logic and data	`Product`, `Order`, `User`
View	UI presentation (XAML/Razor)	`ProductPage.xaml`
ViewModel	UI logic and state	`ProductViewModel`

Workflow

Keep Views dumb — no business logic in code-behind
Use data binding — connect View to ViewModel properties
Commands for actions — handle user interactions via ICommand
Inject dependencies — services go into ViewModel constructors
Test ViewModels — they should be unit testable without UI

Track record

Benchmark

20 / 22

test cases passed, vs 19 / 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

managedcode / dotnet-skills

catalog/Libraries/MVVM-Toolkit/skills/mvvm/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 2 files

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

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See it in action

What's inside

MVVM Pattern for .NET

Trigger On

Documentation

References

Core Concepts

Workflow

Track record

Benchmark

Adoption

SkillSafety

Source

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