Conciseness

The body is command-dense and almost exclusively contains non-generic, domain-specific knowledge Claude would not already know (Flutter 3.24.0 proxy-IP removal, port 8083 default, MOV W0, #1 / RET patch bytes '20 00 80 52 C0 03 5F D6', snapshot-format caveats). It falls short of score 5 because the BoringSSL mechanism is explained twice — 'reFlutter patches the ssl_crypto_x509_session_verify_cert_chain function... to always return true' in Step 2 and again nearly verbatim in Step 3 — and sections like the severity table repeat information. It is well above score 3 since there is no padding or explanation of concepts Claude already knows.

Actionability

Nearly all guidance is copy-paste executable: 'reflutter base.apk', 'java -jar uber-apk-signer.jar --allowResign -a release.RE.apk -o /tmp/', 'r2 -qc 'iz~https'...', and a concrete Python patch snippet. It stops short of score 5 because 'proxy-redirect.js' is referenced but never provided ('hooks connect() syscall, redirects to Burp IP' is effectively pseudocode), and the manual patch uses unresolved placeholders ('f.seek(<offset>)') without explaining how to locate the offset precisely.

Workflow Clarity

Steps 1-6 are clearly sequenced with expected outputs at key checkpoints ('Expect: ~1 class, LoadLibrary("app"), nothing useful'; 'Launch app — HTTPS traffic appears in Burp') and version-branching for Flutter <=3.23 vs >=3.24. It does not reach score 5 because the manual binary patch path has no validation loop (no disassemble-before/verify-after step despite the acknowledged 'wrong offset crashes the app' risk), and the iOS path ends at 'check reFlutter README for current support' without a fallback. The destructive-operation cap at 3 does not apply since the primary reflutter workflow is non-destructive and includes verification (traffic visible in Burp).

Progressive Disclosure

The skill is a single ~250-line file with no bundle files (no references/, scripts/, or assets/ exist) and no internal navigation to detail material. Structure is present (numbered steps, clear headers, a References section of external URLs), but several sections — iOS Flutter.framework patching, Dart snapshot dump, plugin identification, the severity table, and OPSEC notes — are inlined content that would fit better in one-level-deep reference files per the score-3 anchor ('content that should be separate is inline'). It does not reach score 4 because the monolithic layout forces the full playbook into context regardless of which sub-task applies.

Specificity

The description enumerates multiple concrete, comprehensive actions: 'reFlutter Dart-AOT patching, BoringSSL bypass, libapp.so static analysis in Ghidra/radare2, Dart snapshot dump, and iOS Flutter.framework notes'. This matches the score-5 anchor (multiple specific concrete actions, comprehensive coverage); it exceeds score 4 because coverage spans identification, bypass, static analysis, and platform-specific notes with no real gaps.

Completeness

The 'what' is explicit and concrete (reversing, pinning bypass, static analysis, snapshot dump), but the description field contains no 'Use when...' clause or equivalent explicit trigger guidance — the 'when' is entirely absent rather than merely weakly implied. Per the judging guideline, a missing 'Use when...' clause caps completeness at 3; it cannot score 4 because the 'when' is not present in any form.

Trigger Term Quality

Strong natural keyword coverage including file names and tool names users would actually say: 'Flutter', 'SSL pinning bypass', 'libapp.so', 'reFlutter', 'BoringSSL', 'Ghidra/radare2', 'Flutter.framework'. Falls short of the score-5 anchor because common user phrasings like 'intercept Flutter traffic', 'MITM', 'Burp', or 'APK' are absent; it is clearly above score 3 since far more than 'some relevant keywords' are present.

Distinctiveness Conflict Risk

Clear niche with distinct triggers: 'libapp.so', 'reFlutter', 'BoringSSL', 'Flutter.framework', 'Dart snapshot' are unambiguous Flutter-reversing markers that no generic mobile or static-analysis skill would claim. Minimal conflict risk with related Android/iOS skills since the description explicitly frames itself around Flutter-specific artifacts.