A workflow for upgrading Flutter, Dart, and package versions in a Flutter repository. Flutter is a framework for building apps, and package dependencies are external code the app uses.

Use it when changing the Flutter SDK, Dart version, app dependencies, or code-generation tools, then checking that local commands and CI still work.

It keeps version settings, generated code, tests, lint rules, and continuous integration checks aligned during an upgrade.

upgrade — Skill by strvcom

Install

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.

agentmods

npx agentmods add skills/strvcom/flutter-template/upgrade

Any agent

npx skills add strvcom/flutter-template --skill upgrade

Clone the repo

git clone --depth 1 https://github.com/strvcom/flutter-template

Made for: Claude Code, Codex.

Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,491 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00047	$0.01491
Opus 5	$0.00023	$0.00745
Sonnet 5	$0.00009	$0.00298
Haiku 4.5	$0.00005	$0.00149

Measured 2d ago against content hash 094adfbd868c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 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.

.agents/skills/upgrade/SKILL.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Flutter Template Upgrade

Use this skill for SDK and dependency upgrades in this repository.

Read First

AGENTS.md
docs/PROJECT_GUIDELINES.md
.fvmrc
pubspec.yaml
makefile
build.yaml
.github/workflows/

Upgrade Goals

Keep .fvmrc and pubspec.yaml aligned.
Let pub resolve compatible versions rather than guessing.
Regenerate all generated code after package changes.
Fix API migrations and lint changes introduced by the newer toolchain.
Verify local commands and CI still reflect the project pin.

Workflow

Check current SDK pin in .fvmrc and pubspec.yaml.
Confirm the target Flutter version.
Update .fvmrc.
Activate the new SDK locally — this always needs to happen after changing .fvmrc:
```
fvm install
fvm use <version>
fvm global <version>
```
fvm use <version> updates the project SDK, while fvm global <version> keeps plain flutter commands from resolving through an older global SDK.
Update .vscode/settings.json — set dart.flutterSdkPath to .fvm/flutter_sdk. Then restart VSCode (or run "Dart: Change Flutter SDK" from the command palette) so the Dart/Flutter extension reloads against the new SDK. Skipping this causes the IDE to keep analyzing with the old version even though the CLI is already on the new one.
Update pubspec.yaml environment constraints to match the new SDK floor.
Run dependency audit commands such as fvm flutter pub outdated.
Use fvm flutter pub upgrade --major-versions when the goal is to move the dependency graph forward broadly.
Review any changed direct constraints in pubspec.yaml.
Run:
- fvm flutter pub get
- make gen
- fvm flutter analyze
- fvm flutter test
Fix breakages from:
- package API changes
- analyzer/lint changes
- build runner or codegen config warnings
- generated native plugin files
Review GitHub Actions to ensure they still use the pinned project SDK.

Read the full file on GitHub · 153 lines

Changes

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 · 153 lines · 47 tokens per session scan A 094adfbd868c

Subscribe to this mod's changes

upgrade is a skill published in the GitHub repository strvcom/flutter-template (24 stars, last pushed 2mo ago), licensed MIT. It adds 47 tokens to every session and 1,491 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 2026-08-30.

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