Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/dotnet/maui/collectionview-iosgit clone --depth 1 https://github.com/dotnet/mauiWhat 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 | $0.00460 | $0.00460 |
| Opus 5 | $0.00230 | $0.00230 |
| Sonnet 5 | $0.00092 | $0.00092 |
| Haiku 4.5 | $0.00046 | $0.00046 |
Grade A, and why
maui collectionview-ios.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 2d 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
CollectionView — iOS/MacCatalyst (Items2/ Handler)
New iOS/MacCatalyst work targets Items2/. Items/iOS/ is deprecated. See
collectionview-handler-detection.instructions.mdfor the full platform→handler mapping.
UICollectionView Cell Measurement
- Scope cell layout invalidation to the affected cell — avoid
InvalidateLayout()on the entire collection for single-cell changes - Custom
UICollectionViewCellsubclasses should handleMeasureInvalidatedonly when the hosted MAUI control actually needs remeasuring - Cell sizing must stay in sync between the measure pass and the layout pass — out-of-sync causes visual glitches
UICollectionViewCompositionalLayout
- Layout configuration must match the
ItemsLayoutspecification (Linear, Grid, or custom) ItemsLayoutproperty changes require full layout reconfiguration — partial updates leave stale section configuration- Group header/footer template changes must invalidate the correct section scope, not the entire layout
Memory Management
- Use static callback patterns to avoid retain cycles between cells and their hosting handler
- Remove
NSNotificationCenterobservers inDisconnectHandler - Weak references for long-lived observers of short-lived cells — cells are recycled and reused
Regression Patterns
- Test across empty collection, single item, many items, and with grouping — a fix for one layout scenario routinely breaks another
Items/ iOS (Deprecated)
- Files in
Handlers/Items/*.iOS.csare deprecated — prefer Items2/ for new work - Only modify Items/ iOS code for explicit legacy maintenance or backward-compatibility fixes
Platform file extension rules (
.ios.csvs.maccatalyst.cscompilation targets) are defined incopilot-instructions.md§ Platform-Specific File Extensions. See alsocollectionview-handler-detection.instructions.mdfor which handler directory to target per platform.
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.
- 2d ago First seen · 35 lines · 460 tokens per session scan A 0ae0ee467746
maui collectionview-ios.instructions.md is an instructions file published in the GitHub repository dotnet/maui (23,317 stars, last pushed 2d ago), licensed MIT. It adds 460 tokens to every session, about $0.0023 per session on Opus 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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