.NET MAUI is a C# and XAML framework for building native mobile and desktop applications from one shared codebase. Developers use it to create apps for Android, iOS, iPadOS, macOS, and Windows. The catalogue entries provide skills, instructions, and agents for working with .NET MAUI.
Borrowing it
Nothing to install: this file belongs to dotnet/maui. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/dotnet/maui/main/.github/instructions/layout-system.instructions.mdgit clone --depth 1 https://github.com/dotnet/mauiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/dotnet/maui/layout-system)<a href="https://agentmods.dev/instructions/dotnet/maui/layout-system"><img src="https://agentmods.dev/badge/instructions/dotnet/maui/layout-system/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/dotnet/maui/layout-system"><img src="https://agentmods.dev/badge/instructions/dotnet/maui/layout-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00400 | $0.00400 |
| Opus 5.5 | $0.00160 | $0.00160 |
| Sonnet 5.5 | $0.00080 | $0.00080 |
| Haiku 4.5 | $0.00040 | $0.00040 |
Grade A, and why
maui layout-system.instructions.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Layout System Rules
Measure/Arrange Contract
Measure(widthConstraint, heightConstraint)returns the desired size — it must not mutate layout state or trigger side effectsArrangeChildren(bounds)positions children within the given bounds — it must respect the size returned fromMeasure, not compute independently- A child measured with
widthConstraint=200must not be arranged withwidth=300— constraints must stay consistent across passes - Subtract padding, margin, and border thickness from constraints BEFORE passing to children
Constraint Propagation
- Stack layouts pass
double.PositiveInfinityalong the stacking axis and the parent constraint along the cross axis - Grid cells compute per-cell constraints from column/row definitions — do not pass the full grid constraint to each child
MeasureContenthelpers onIContentViewhandle inset subtraction — use them instead of manual arithmetic- On Windows,
double.NaNrepresents unconstrained dimensions (WinUI convention) — do not confuse withdouble.PositiveInfinity(MAUI convention)
Infinite Loop Avoidance
- Never create circular dependencies where child size depends on parent AND parent size depends on child
- Layout invalidation (
InvalidateMeasure) must not re-trigger during an active measure pass - ScrollView content must always be re-measured on layout trigger — do not aggressively cache child measurements in scrollable containers
Performance on Hot Paths
Layout measure/arrange methods are hot paths. All rules from
performance-hotpaths.instructions.mdapply — no LINQ, closures, or allocations. Additionally for layout:
- Cache expensive computations (e.g.,
GridStructure) and invalidate only when inputs change - Bindable property change handlers should skip layout invalidation when the value has not actually changed
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 31 lines · 400 tokens per session scan A c75e33a49001
maui layout-system.instructions.md is an instructions file published in the GitHub repository dotnet/maui (23,322 stars, last pushed today), licensed MIT. It adds 400 tokens to every session, about $0.0016 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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