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Run npx skillmds@latest add flutter/engine-whats-new in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Who published Engine Whats New?

flutter (@flutter) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Engine Whats New by flutter — Agent Skill

Name: Engine Whats New
Rating: 4.2 (5 reviews)
Author: flutter

Engine Whats New

Generates the "what's new" release summary and diff file for changes in the Flutter engine (//engine/src/flutter) between two releases (e.g., 3.47 vs 3.44). When to use: - Only activate when explicitly asked by the user to generate what's new in the engine, diff Flutter engine releases, or produce an engine release summary. When not to use: - Do not use for general questions about commits, individual file history, or codebase searches unless explicitly requested to generate the engine release diff or summary.

flutter b6adc9e 3 files · 21.7 KB Updated Sep 9, 2026

File contents

Flutter Engine What's New & Diff Skill

Workflow

1. Identify Inputs

Extract the following from the user's request:

Target Release (<TARGET_RELEASE>): The Flutter release version to analyze (e.g., 3.47, 3.47.0, or flutter-3.47-candidate.0).
Base Release (<BASE_RELEASE>): Optional. The prior Flutter release to compare against (e.g., 3.44). If omitted by the user, the script will automatically calculate the predecessor release (e.g., for 3.47 it automatically selects 3.44).

2. Run the Generator Tool

Execute the Dart script from the Flutter repository root:

dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release <TARGET_RELEASE>

If the user specifies a custom base release or output paths:

dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release <TARGET_RELEASE> --from <BASE_RELEASE> --output-diff engine_diff_<BASE_RELEASE>_to_<TARGET_RELEASE>.diff --output-summary engine_whats_new_<TARGET_RELEASE>.md

To output structured JSON for programmatic consumption:

dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release <TARGET_RELEASE> --format json

3. Review Generated Artifacts & Present to User

The tool produces two primary artifacts in the repository root:

Diff File (engine_diff_<BASE_RELEASE>_to_<TARGET_RELEASE>.diff): The full unified git diff of all changes in //engine/src/flutter between the two releases.
Summary Document (engine_whats_new_<TARGET_RELEASE>.md): A categorized Markdown summary covering:
- Overview & Statistics: Total engine commits, files changed, additions, and deletions.
- 🚀 Impeller & Graphics Rendering: Vulkan, Metal, OpenGL, shaders, and display list updates.
- 🌐 Web Engine & Wasm: Web SDK, CanvasKit, and WebAssembly changes.
- 📱 Android Embedding: Gradle/AGP updates, Android view rendering, and Java/Kotlin embedding changes.
- 🍎 iOS & macOS Embeddings: Darwin platform view lifecycle, Metal views, and macOS/iOS updates.
- 🪟 Windows & Linux Desktop Embeddings: Win32 compositor, Linux GTK embedding, and desktop shell fixes.
- 🔤 Text, Typography & Accessibility: Semantics, IME, font fallback, and text layout improvements.
- 🔄 Dependency Rolls: Skia, Dart SDK, ICU, HarfBuzz, and ANGLE rolls.
- 🛠️ Build System, CI & Tooling: GN build files, luci scripts, and testing utilities.

Provide the user with a concise overview of the results and links to the generated diff and markdown summary files.

Examples

User: "Generate what's new in the engine for Flutter 3.47."
Agent:
1. Identifies target release 3.47.
2. Runs dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release 3.47.
3. Reports the summary statistics (e.g., 354 commits, 1179 files changed) and shares the generated engine_diff_3.44_to_3.47.diff and engine_whats_new_3.47.md.
User: "Diff the engine changes between Flutter 3.41 and 3.44."
Agent:
1. Identifies base release 3.41 and target release 3.44.
2. Runs dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --from 3.41 --to 3.44.
3. Presents the breakdown of engine changes and the diff file.

---name: engine-whats-newdescription: Generates the "what's new" release summary and diff file for changes in the Flutter engine (//engine/src/flutter) between two releases (e.g., 3.47 vs 3.44). When to use: - Only activate when explicitly asked by the user to generate what's new in the engine, diff Flutter engine releases, or produce an engine release summary. When not to use: - Do not use for general questions about commits, individual file history, or codebase searches unless explicitly requested to generate the engine release diff or summary.--- # Flutter Engine What's New & Diff Skill ## Workflow ### 1. Identify Inputs Extract the following from the user's request: * **Target Release (`<TARGET_RELEASE>`):** The Flutter release version to analyze (e.g., `3.47`, `3.47.0`, or `flutter-3.47-candidate.0`). * **Base Release (`<BASE_RELEASE>`):** Optional. The prior Flutter release to compare against (e.g., `3.44`). If omitted by the user, the script will automatically calculate the predecessor release (e.g., for `3.47` it automatically selects `3.44`). ### 2. Run the Generator Tool Execute the Dart script from the Flutter repository root: ```bash dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release <TARGET_RELEASE> ``` If the user specifies a custom base release or output paths: ```bash dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release <TARGET_RELEASE> --from <BASE_RELEASE> --output-diff engine_diff_<BASE_RELEASE>_to_<TARGET_RELEASE>.diff --output-summary engine_whats_new_<TARGET_RELEASE>.md ``` To output structured JSON for programmatic consumption: ```bash dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release <TARGET_RELEASE> --format json ``` ### 3. Review Generated Artifacts & Present to User The tool produces two primary artifacts in the repository root: 1. **Diff File (`engine_diff_<BASE_RELEASE>_to_<TARGET_RELEASE>.diff`):** The full unified git diff of all changes in //engine/src/flutter between the two releases. 2. **Summary Document (`engine_whats_new_<TARGET_RELEASE>.md`):** A categorized Markdown summary covering: * **Overview & Statistics:** Total engine commits, files changed, additions, and deletions. * **🚀 Impeller & Graphics Rendering:** Vulkan, Metal, OpenGL, shaders, and display list updates. * **🌐 Web Engine & Wasm:** Web SDK, CanvasKit, and WebAssembly changes. * **📱 Android Embedding:** Gradle/AGP updates, Android view rendering, and Java/Kotlin embedding changes. * **🍎 iOS & macOS Embeddings:** Darwin platform view lifecycle, Metal views, and macOS/iOS updates. * **🪟 Windows & Linux Desktop Embeddings:** Win32 compositor, Linux GTK embedding, and desktop shell fixes. * **🔤 Text, Typography & Accessibility:** Semantics, IME, font fallback, and text layout improvements. * **🔄 Dependency Rolls:** Skia, Dart SDK, ICU, HarfBuzz, and ANGLE rolls. * **🛠️ Build System, CI & Tooling:** GN build files, luci scripts, and testing utilities. Provide the user with a concise overview of the results and links to the generated diff and markdown summary files. ## Examples - **User:** "Generate what's new in the engine for Flutter 3.47." - **Agent:** 1. Identifies target release `3.47`. 2. Runs `dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --release 3.47`. 3. Reports the summary statistics (e.g., 354 commits, 1179 files changed) and shares the generated `engine_diff_3.44_to_3.47.diff` and `engine_whats_new_3.47.md`. - **User:** "Diff the engine changes between Flutter 3.41 and 3.44." - **Agent:** 1. Identifies base release `3.41` and target release `3.44`. 2. Runs `dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart --from 3.41 --to 3.44`. 3. Presents the breakdown of engine changes and the diff file.

Frequently asked questions