Conciseness

The body is mostly dense, technical content with real code and commands, but the full anchor-link table of contents, the "Why Download Precompiled Binaries?" rationale section, and benefit prose like "executes in milliseconds compared to potentially long multi-minute compilation processes" are padding that could be trimmed. This fits 'efficient with minor over-explanation' rather than the lean top anchor.

Actionability

Guidance is largely executable: `dart pub add` commands, complete pubspec blocks, full hook/build.dart and hook/link.dart scripts, a download helper with hash verification, and per-OS verification commands (nm, dumpbin). Minor gaps keep it below copy-paste-ready: placeholder MD5 hashes, a placeholder GitHub release URL, and API inconsistency between methods (CLibrary in Method 1 vs CBuilder in Method 2).

Workflow Clarity

The workflow is clearly sequenced (4 numbered steps, a decision table for choosing Method 1 vs 2, then per-method walkthroughs) and closes with an explicit verification checklist including tree-shaking symbol verification, the no-bundle scenario, and an offline-compliance test with `local_build: true`. This matches the top anchor: clear sequence, explicit validation checkpoints, and error-recovery guidance.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), so ~420 lines are entirely inline in SKILL.md. Section headers and a TOC provide real structure, but content that clearly belongs in separate reference files — the full Method 1 and Method 2 implementations and the detailed verification procedures — is inlined with no external references signaled, matching the 'content that should be separate is inline' anchor.

Specificity

The description lists multiple concrete actions — "compiling and packaging C/C++ source code into dynamic or static libraries (Code Assets)", "secure hash-validated binary downloads", and "advanced linker tree-shaking" — tied to named mechanisms (hook/build.dart, hook/link.dart, package:record_use). Coverage is comprehensive rather than gapped, matching the top anchor.

Completeness

It clearly answers both 'what' (compile/package C/C++ into Code Assets via build/link hooks with tree-shaking or hash-verified downloads) and 'when' via an explicit "Use when a user asks to:" clause with concrete trigger phrases. The when-clause is fully explicit, so it exceeds the 4 anchor.

Trigger Term Quality

It quotes explicit natural trigger phrases: 'setup native assets', 'compile C/C++ source code', 'bundle dynamic libraries', 'build native C code', 'link native assets', 'implement build.dart or link.dart hooks', 'integrate C/C++ interop in Dart/Flutter'. This covers synonyms and phrasings a user would naturally say, matching the comprehensive-synonyms anchor.

Distinctiveness Conflict Risk

The Dart Native Assets hook niche is distinct and the file-path triggers (build.dart/link.dart) are unlikely to collide, but generic phrases like 'compile C/C++ source code' and 'build native C code' could fire in non-Dart C build contexts, giving minor overlap risk — between the 4 and 5 anchors, closer to 4.