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 skills/strvcom/flutter-template/layout-debugnpx skills add strvcom/flutter-template --skill layout-debuggit clone --depth 1 https://github.com/strvcom/flutter-templateWhat 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 | $0.00070 | $0.01119 |
| Opus 5 | $0.00035 | $0.00560 |
| Sonnet 5 | $0.00014 | $0.00224 |
| Haiku 4.5 | $0.00007 | $0.00112 |
Grade A, and why
layout-debug 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.
How it starts
The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Flutter Template Layout Debug
Use this skill for UI fixes and responsive layout work in this Flutter template.
Read First
AGENTS.mddocs/PROJECT_OVERVIEW.mddocs/PROJECT_GUIDELINES.md- The affected
*_page.dartand*_page_content.dart - Shared widgets in
lib/common/component/orlib/common/composition/used by the screen
Error Signatures
Map console/stack-trace error strings directly to fixes before broader diagnosis:
- "Vertical viewport was given unbounded height" — a scrollable (
ListView,GridView) sits inside an unconstrained vertical parent (usually aColumn). Wrap the scrollable inExpanded, or give it an explicit height viaSizedBox/ConstrainedBox. - "An InputDecorator...cannot have an unbounded width" — a
TextField/TextFormFieldsits inside an unconstrained horizontal parent (usually aRow). Wrap it inExpandedorFlexible. - "RenderFlex overflowed by N pixels" — a
Row/Columnchild requests more space than the parent allows (yellow/black stripes). Wrap the overflowing child inExpandedorFlexible, or let text wrap. - "Incorrect use of ParentData widget" —
Expanded/Flexibleis not a direct child of aRow/Column/Flex, orPositionedis not a direct child of aStack. Move it so it is. - "RenderBox was not laid out" — cascading side effect, not the root cause. Ignore it and look further up the output for the primary constraint violation above.
Diagnosis Checklist
- Reproduce or identify the failing viewport, text scale, platform, and state.
- Inspect the nearest
Row,Column,Stack,ListView,SingleChildScrollView,Expanded,Flexible, and fixed-size widget. - Find whether the problem is:
- missing constraints
- conflicting constraints
- unbounded scrollable content
- fixed dimensions where content is dynamic
- text that cannot wrap or scale within its parent
- a
Stackor overlay that visually collides with later content
- Fix the closest layout cause instead of papering over the symptom with arbitrary sizes.
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 · 95 lines · 70 tokens per session scan A 24ede8e3e399
layout-debug is a skill published in the GitHub repository strvcom/flutter-template (24 stars, last pushed 2mo ago), licensed MIT. It adds 70 tokens to every session and 1,119 once invoked, about $0.0003 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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