Flutter SDK Version, Deprecation & Migration Reference

Freshness contract — read first. Generated 2026-08-29. Stable at generation time: Flutter 3.47.2 (2026-08-27) bundling Dart 3.13.2. Regenerate with python3 scripts/build_flutter_sdk_changelog.py --fetch (~4s; resolves the SDK from $FLUTTER_ROOT or which flutter, no hard-coded paths). Drift is detected by python3 scripts/check_freshness.py — exit 1 means the published stable moved ahead of these files. If the gate fails, regenerate before answering any version question. The gate itself is tamper-tested: python3 scripts/test_gate_tamper.py seeds five defects (stale header, deleted minor row, wrong Dart floor, wrong first-stable row, emptied deprecation reference) and requires exit 1 with the right reason for each, plus a green control run.

Rule 0 — never state a Flutter version from memory

Flutter ships a new stable minor roughly every 3 months, so any version fact held in model weights is stale by construction. This skill exists because that staleness silently breaks pubspec.yaml bounds and CI.