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/nylo-core/claude-code/flutter-versioningnpx skills add nylo-core/claude-code --skill flutter-versioninggit clone --depth 1 https://github.com/nylo-core/claude-codeWhat 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 | $0.00044 | $0.03197 |
| Opus 5 | $0.00022 | $0.01598 |
| Sonnet 5 | $0.00009 | $0.00639 |
| Haiku 4.5 | $0.00004 | $0.00320 |
Grade A, and why
flutter-versioning 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.
How it starts
The opening of the file, as written. The whole thing — 365 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Flutter Versioning
Overview
Flutter uses a single version field in pubspec.yaml with the format x.y.z+build to define both the user-facing version string and the internal build number. This value propagates to iOS (CFBundleShortVersionString / CFBundleVersion) and Android (versionName / versionCode) during the build process.
When to Use
- User needs to set or bump the app version before a release
- User is confused about the
versionformat inpubspec.yaml - User needs to understand how Flutter versions map to platform-specific values
- User is setting up CI/CD and needs automated version bumping
- App was rejected because the version or build number was not incremented
- NOT for Dart package versioning on pub.dev (similar format but different context)
Quick Reference
| Concept | pubspec.yaml | iOS | Android |
|---|---|---|---|
| Version string | x.y.z |
CFBundleShortVersionString |
versionName |
| Build number | +build |
CFBundleVersion |
versionCode |
| Full format | version: 1.2.3+4 |
1.2.3 / 4 |
1.2.3 / 4 |
| Where set | pubspec.yaml |
Auto from pubspec | Auto from pubspec |
| Override | N/A | --build-name / --build-number flags |
Same flags |
Version Format in pubspec.yaml
version: 1.2.3+4
Breaking this down:
1— Major version: Incremented for breaking changes or major milestones2— Minor version: Incremented for new features (backwards compatible)3— Patch version: Incremented for bug fixes+4— Build number: Incremented for every build submitted to stores
Rules
- The version string (
x.y.z) follows Semantic Versioning - The build number (
+build) must be a positive integer - The build number is optional in pubspec.yaml but required for store submissions
- If omitted, the build number defaults to
0
How Versions Map to Platforms
iOS
Flutter reads pubspec.yaml and sets these in the generated Xcode build:
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 · 365 lines · 44 tokens per session scan A 7a3a8f36ff59
flutter-versioning is a skill published in the GitHub repository nylo-core/claude-code (4 stars, last pushed 4mo ago), licensed MIT. It adds 44 tokens to every session and 3,197 once invoked, about $0.0002 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 2026-08-31.
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