The body is dense and assumes Claude's competence — Metro, Hermes bytecode (HBC), split-bundle, and MMKV are used without primer-level explanation, and the explanations that do appear (self vs total, __r vs __d, pre-warm side effect) are tool-specific non-obvious details that earn their place; it is not level 2 because there is no generic concept padding to tighten away.

Provides fully executable, copy-paste-ready guidance — 'export ONEKEY_STARTUP_PROFILE=1', 'yarn app:android', 'eas build --profile profile-startup --platform android', eas.json/Info.plist snippets, and grep/awk parsing scripts; it is not level 2 because the code and commands are complete rather than pseudocode or abstract direction.

The enable→build→run→check sequence is clear and includes an explicit validation checkpoint with an error-recovery feedback loop (the 'Cross-platform check' missing→likely cause→fix table); it is not level 2 because validation steps are explicit, not merely implicit or absent.

The skill is well-organized with clear headers, tables, and section separators, but it is a single ~200-line monolithic file with all detail inline and no offloading into bundle reference files; it is not level 3 because content such as the example log dump, parsing scripts, and caveats could be split into one-level-deep references, and not level 1 because organization and navigation within the file are solid and there are no deeply nested references.

Names multiple concrete measurement actions — 'per-module JS factory timings, HBC I/O/parse breakdown, per-segment timings' — matching the level-3 anchor of listing several specific concrete actions; it is not level 2 because it goes beyond naming just a domain and a couple actions.

Explicitly answers both 'what' (deep startup profiling with three measured layers) and 'when' via a clear 'Use when diagnosing cold-start regressions...' clause plus explicit triggers; it is not level 2 because the 'when' is stated, not merely implied.

Provides broad natural-term coverage users would actually say — 'startup profile, 启动性能分析, module timing, HBC parse time, segment timing, require cost' — rather than jargon; it is not level 2 because common variations are well represented, including bilingual and API-level terms.

A clear niche — OneKey mobile startup profiling gated behind the named env var ONEKEY_STARTUP_PROFILE with distinctive trigger tokens — making conflict with other skills unlikely; it is not level 2 because it is not merely 'somewhat specific' but tightly scoped to this product and instrumentation.