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 skills add VeryGoodOpenSource/vgv-ai-flutter-plugin --skill dart-flutter-sdk-upgradegit clone --depth 1 https://github.com/VeryGoodOpenSource/vgv-ai-flutter-pluginWrote 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/skills/verygoodopensource/vgv-ai-flutter-plugin/dart-flutter-sdk-upgrade)<a href="https://agentmods.dev/skills/verygoodopensource/vgv-ai-flutter-plugin/dart-flutter-sdk-upgrade"><img src="https://agentmods.dev/badge/skills/verygoodopensource/vgv-ai-flutter-plugin/dart-flutter-sdk-upgrade.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Anti-Refusal · line 42 Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.
- medium Excessive Agency · line 19 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
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 | $0.00078 | $0.02529 |
| Opus 5 | $0.00039 | $0.01264 |
| Sonnet 5 | $0.00016 | $0.00506 |
| Haiku 4.5 | $0.00008 | $0.00253 |
Grade A, and why
dart-flutter-sdk-upgrade 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 9d 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 — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VGV Flutter/Dart SDK Upgrade — Quick Reference
One PR per project. Only CI workflow and pubspec.yaml changes — no logic, no dependency
version bumps, no test changes.
Core Standards
Apply these standards to ALL SDK upgrade work:
- Flutter and Dart versions differ — a Flutter release ships a Dart SDK whose version number is unrelated to it, and the pubspec
sdk:constraint takes the Dart number, never the Flutter one. Look the pairing up in the release archive at https://docs.flutter.dev/install/archive - Never state a bundled Dart version from memory — not from recall, not by inference from the Flutter number, and not from an example in this file. Either the user supplied the Dart version, or you read it off the archive, or you ask. There is no fourth source
- Flutter CI uses
MAJOR.MINOR.x— no caret,.xwildcard resolves to latest patch - Dart CI uses exact patch —
MAJOR.MINOR.PATCH, no caret, no wildcard - pubspec pins exact patch — use
^MAJOR.MINOR.PATCHwith the specific patch version - Pure Dart packages — use the Dart version directly, no Flutter mapping needed. The CI key is
dart_sdkindart_package.yml, notflutter_versioninflutter_package.yml, and the environment block getssdk:with noflutter:line beside it - Write the CI block even without the file — the reusable workflow and its version key are determined by the package type, so a workflow you have not seen is still a known shape. Produce the
with:block from the CI workflows section below and name the file it belongs in rather than asking for the file first - Verify with
pub getandanalyze— don't silently resolve conflicts - Decline out-of-scope edits, don't caveat them — when asked to also bump a dependency, fix a lint, or change code, do not produce that edit at all. Deliver the SDK constraint and CI changes, report the rest as separate follow-up work
0. Resolve target version
Flutter bundles a specific Dart release, and the two version numbers are unrelated. A bump to
Flutter 3.35.5 does not make the Dart constraint ^3.35.5, and the Dart number cannot be
derived from the Flutter number by any rule. Every SDK upgrade therefore starts with two
versions, not one: the Flutter release being targeted, and the Dart release it ships.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 236 lines · 78 tokens per session scan A c4e057c6097b
dart-flutter-sdk-upgrade is a skill published in the GitHub repository VeryGoodOpenSource/vgv-ai-flutter-plugin (160 stars, last pushed 4d ago), licensed MIT. It adds 78 tokens to every session and 2,529 once invoked, about $0.0004 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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