What is migrate-intellij-util?

A code-migration guide for IntelliJ Platform plugins that replaces standard Java and Kotlin utilities with IntelliJ-specific alternatives.

Use it to migrate lists, maps, strings, file paths, timers, null checks, and arrays, while checking that tests and plugin verification still pass.

It helps plugin code follow the platform’s conventions and can reduce unnecessary memory use or improve handling of common operations.

migrate-intellij-util — Skill for Claude Code and Codex by flutter

About the project

Flutter Plugin for IntelliJ is an IntelliJ plugin that adds support for developing Flutter applications, which can run on iOS, Android, and the web. It is used by Flutter developers working in IntelliJ IDEA or Android Studio.

flutter/flutter-intellij · 2,013 stars · on GitHub · docs.flutter.dev

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 flutter/flutter-intellij --skill migrate-intellij-util

Clone the repo

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

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/flutter/flutter-intellij/migrate-intellij-util.svg)](https://agentmods.dev/skills/flutter/flutter-intellij/migrate-intellij-util)

Your own site

<a href="https://agentmods.dev/skills/flutter/flutter-intellij/migrate-intellij-util"><img src="https://agentmods.dev/badge/skills/flutter/flutter-intellij/migrate-intellij-util.svg" alt="Measured on agentmods" height="20"></a>

Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 558 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	$0.00031	$0.00558
Opus 5	$0.00015	$0.00279
Sonnet 5	$0.00006	$0.00112
Haiku 4.5	$0.00003	$0.00056

Measured 7d ago against content hash ef7252b49cdb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

migrate-intellij-util 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 7d 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/migrate-intellij-util/SKILL.md · 47 lines

How it starts

The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: API Migration to use com.intellij.util.* classes and methods

You are tasked with optimizing memory usage, consistency, and performance by migrating standard Java/Kotlin classes to IntelliJ's specialized com.intellij.util implementations.

Objective

Go read https://javadoc.jetbrains.net/teamcity/openapi/current/com/intellij/util/package-summary.html, and then optimize memory usage, consistency, and performance by migrating standard Java/Kotlin classes to IntelliJ's specialized com.intellij.util implementations.

Candidates for Migration

ArrayList -> SmartList (for potentially empty/small lists)
HashMap / ConcurrentHashMap -> ContainerUtil maps
String manipulation -> StringUtil (e.g., isEmpty, join, notNullize)
Path / File string manipulation -> PathUtil
javax.swing.Timer -> Alarm (for UI-related callbacks/debouncing)
Null checks -> ObjectUtils (e.g., doIfNotNull, coalesce)
Array resizing/merging -> ArrayUtil

Workflow Instructions

1. Baseline

Run ./gradlew testClasses, ./gradlew test, and ./gradlew verifyPlugin to ensure project is in a good state.

2. Select Target

Identify a single migration opportunity within a single package.

3. Constraint

Keep the change extremely small (max 50 lines of code change).

4. Migrate

Replace standard API with the com.intellij.util equivalent.

5. Verify

Run ./gradlew testClasses to ensure migration didn't break test compilation.
Run ./gradlew test and ./gradlew verifyPlugin to ensure no regressions.
Suggest manual test steps: Check code changes made and write test steps for a user to execute that will trigger changed code paths. If needed, add logging statements to verify code paths have successfully run.

6. Report & Review

Summarize the migration.
Test Location: Explicitly state where in the IDE user should go to test changed functionality (e.g., "Go to Preferences > Languages & Frameworks > Flutter").
Action: Ask user to review changes closely.
Do not commit or push.
Provide a suggested Git commit message (e.g., "Migrate code to use StringUtil in [Class Name]").

Read the full file on GitHub · 47 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.

7d ago First seen · 47 lines · 31 tokens per session scan A ef7252b49cdb

Subscribe to this mod's changes

migrate-intellij-util is a skill published in the GitHub repository flutter/flutter-intellij (2,013 stars, last pushed 3d ago), licensed BSD-3-Clause. It adds 31 tokens to every session and 558 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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