flutter-upgrade-migration

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.

Any agent

npx skills add jggomez/expert-ai-developer-skills --skill flutter-upgrade-migration

Clone the repo

git clone --depth 1 https://github.com/jggomez/expert-ai-developer-skills

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/flutter-upgrade-migration/github.svg)](https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/flutter-upgrade-migration)

Your own site

<a href="https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/flutter-upgrade-migration"><img src="https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/flutter-upgrade-migration/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/flutter-upgrade-migration"><img src="https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/flutter-upgrade-migration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,211 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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 5.1	$0.00081	$0.01211
Opus 5.5	$0.00032	$0.00484
Sonnet 5.5	$0.00016	$0.00242
Haiku 4.5	$0.00008	$0.00121

Measured today against content hash 23ac56fbabd0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

flutter-upgrade-migration 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 today.

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.

plugins/antigravity/senior-dev-flutter/skills/flutter-upgrade-migration/SKILL.md · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Flutter Upgrade & Migration

Overview

The Flutter Upgrade & Migration skill establishes an ordered, risk-mitigated strategy for upgrading Flutter and Dart SDK versions, migrating breaking dependency majors, and systematically clearing codebase-wide deprecation warnings. Working across Claude Code and Google Antigravity, this skill structures major migrations into isolated, reviewable commits—preventing long-running broken branches and untangling dependency solver deadlocks.

When to Use

Trigger Scenarios

Upgrading to a new Flutter stable milestone (e.g., 3.24 → 3.27 → 3.29).
Bumping core dependencies across major breaking versions (e.g., GoRouter, Riverpod, Dio).
Clearing accumulated deprecation warnings across a large multi-module codebase.
Resolving transitive package version dependency conflicts during flutter pub get.

When NOT to Use

Automatic single-file lint fixes: Use dart fix or dart-run-static-analysis for local automated fixes.
Trivial patch version updates: Routine minor bug fix dependency bumps (^1.2.3 to ^1.2.4) should proceed without full migration planning.
Python or backend upgrades: For Python version transitions or library upgrades, use python-expert or managing-python-dependencies.

Process

flowchart TD
    A[Migration Plan Initiated] --> B[Step 1: SDK Bump & Pin Baseline]
    B --> C[Step 2: Automated dart fix & Deprecation Triage]
    C --> D[Step 3: Dependency Major Version Bumps]
    D --> E[Step 4: Release Matrix & Integration Verification]
    E --> F[Update .fvmrc & Lockfile]

1. Upgrade Principles

One Axis at a Time: Never bundle an SDK upgrade, major dependency upgrades, and linter rule changes into a single PR.
Pin Before Starting: Commit a green pubspec.lock and record the baseline Flutter version (flutter --version / .fvmrc).
Tests as Safety Net: Ensure test suites pass before touching dependencies.

2. Step 1 — SDK Upgrade Sweep

git switch -c chore/flutter-<version>
flutter --version
flutter upgrade
flutter pub get
dart analyze
flutter test

Review official Flutter and Dart release notes for breaking API changes.
Apply minimal fixes required to achieve a clean compilation and passing test suite.

Read the full file on GitHub · 120 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.

today First seen · 120 lines · 81 tokens per session scan A 23ac56fbabd0

Subscribe to this mod's changes

flutter-upgrade-migration is a skill published in the GitHub repository jggomez/expert-ai-developer-skills (30 stars, last pushed yesterday), licensed Apache-2.0. It adds 81 tokens to every session and 1,211 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-11-06.

Mobile

flutter-upgrade-migration next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
flutter-upgrade-migrationjggomez/expert-ai-developer-skills	Skill	30	yesterday	Apache-2.0	A	81	Claude Code, Codex
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android-tombstone-symbolicationdotnet/skills	Skill	5.8k	yesterday	MIT	A	176	Claude Code
dogfoodcallstack/agent-device	Skill	5.3k	yesterday	MIT	A	55	Claude Code
winapp-mauimicrosoft/winappCli	Skill	1.4k	yesterday	MIT	A	68	Claude Code
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