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audit-ui-thread-safety

Testing & Quality
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Prevent UI freezes and ensure a responsive user experience by validating threading rules and migrating blocking calls off the Event Dispatch Thread (EDT).

QUICK START

How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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Source SKILL.md: https://github.com/flutter/flutter-intellij/blob/HEAD/.agents/skills/audit-ui-thread-safety/SKILL.md

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Skill: UI Thread Safety & Responsiveness

You are tasked with preventing UI freezes and ensuring a responsive user experience by validating threading rules.

Objective

Prevent UI freezes and ensure a responsive user experience by validating threading rules.

Workflow Instructions

1. Baseline

  • Run ./gradlew test and ./gradlew verifyPlugin to ensure the project is in a good state before refactoring.

2. Audit EDT Usage

  • Search for usages of runInEdt, invokeLater, and invokeAndWait.

3. Identify Blocking Calls

  • Ensure no I/O operations (file access, network calls) or heavy computations occur within these UI blocks.

4. Migrate to Background

  • Refactor heavy tasks to run on background threads using Task.Backgroundable or ReadAction.nonBlocking.

5. Check Modality

  • Verify that modal dialogs do not block the UI thread unnecessarily.

6. Verify

  • Run ./gradlew testClasses to ensure safe refactoring.
  • Run ./gradlew test and ./gradlew verifyPlugin to ensure no regressions.
  • Run the plugin in a sandbox (./gradlew runIde) and perform key actions while monitoring for UI freezes.
  • Suggest manual test steps: Check the code changes made and write test steps for a user to execute that will trigger the code paths that have changed. If needed, add logging statements to verify that the code paths have successfully run.

7. Report & Review

  • Summarize the threading fixes.
  • Test Location: Explicitly state where in the IDE the user should go to test the changed functionality (e.g., "Go to Preferences > Languages & Frameworks > Flutter").
  • Action: Ask the user to review the changes closely to ensure no deadlocks or UI freezes are introduced.
  • Do not commit or push.
  • Provide a suggested Git commit message (e.g., "Fix UI freeze: Move heavy computation to background task").