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-androidgit 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 | $0.00428 | $0.00428 |
| Opus 5 | $0.00214 | $0.00214 |
| Sonnet 5 | $0.00086 | $0.00086 |
| Haiku 4.5 | $0.00043 | $0.00043 |
Grade A, and why
maui collectionview-android.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 yesterday.
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 — Android (Items/ Handler)
Items/ is the sole Android handler — see
collectionview-handler-detection.instructions.mdfor the full platform→handler mapping.
RecyclerView Adapter Patterns
- Use range-specific notifications (
NotifyItemRangeInserted,NotifyItemRangeRemoved,NotifyItemRangeChanged) when INCC semantics provide exact affected ranges — prefer these overNotifyDataSetChangedfor preserving scroll position and animations - Full refresh via
NotifyDataSetChangedis valid forResetactions, ambiguous index cases, and header/footer template changes - Handle all
ObservableCollectionchange actions: Add, Remove, Replace, Move, Reset - On
Reset, recalculate adapter state from scratch — do not assume incremental consistency
ViewHolder Recycling
BindingContextMUST be updated on every rebind — stale data from a previous holder is a common source of visual glitches- Do not store item-specific state in the ViewHolder outside of
BindViewHolder— recycled holders carry state from previous items - Dispose and recreate platform views only when the template changes, not on every rebind
Layout Manager
- Select layout manager (Linear, Grid, custom) based on
ItemsLayoutspecification — do not hardcode ItemsLayoutproperty changes require full layout manager replacement, not partial reconfiguration- Account for Android pixel rounding in item measurement — fractional dp values cause 1px gaps
Memory and Lifecycle
- Unsubscribe from
ScrollChangeand adapter observers inDisconnectHandler— do NOT call Dispose on platform objects - Scroll position restoration after adapter data changes must handle empty-collection edge case
Regression Patterns
- Test across empty collection, single item, many items, and with grouping — a fix for one layout scenario routinely breaks another
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.
- yesterday First seen · 33 lines · 428 tokens per session scan A 70e777d17fd8
maui collectionview-android.instructions.md is an instructions file published in the GitHub repository dotnet/maui (23,317 stars, last pushed yesterday), licensed MIT. It adds 428 tokens to every session, about $0.0021 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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