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Get Started Free →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: -
Passed 17 of 21 test cases with the skill, and 4 of 21 without it.
and 24 more in the full report
15 fixed4 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 15 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to summarize engine changes for Flutter 3.48. I don't want custom filenames or JSON formatting. What command should I run from the repository root?
| Checked | Without skill | With skill |
|---|---|---|
| Executes dart .agents/skills/engine-whats-new/scripts/generate_engine_whats_new.dart with --release 3.48. | Missed | Passed |
The instructions your model reads when the skill loads.
Extract the following from the user's request:
<TARGET_RELEASE>): The Flutter release version to analyze (e.g., 3.47, 3.47.0, or flutter-3.47-candidate.0).<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).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
The tool produces two primary artifacts in the repository root:
engine_diff_<BASE_RELEASE>_to_<TARGET_RELEASE>.diff): The full unified git diff of all changes in //engine/src/flutter between the two releases.engine_whats_new_<TARGET_RELEASE>.md): A categorized Markdown summary covering:
test cases passed, vs 4 / 21 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.