Conciseness

The body is dense with non-obvious, domain-specific knowledge (the ~2 GiB Buffer limit and ERR_FS_FILE_TOO_LARGE recovery path, edge-type semantics, VS Code retention patterns, streaming techniques) and avoids explaining concepts Claude already knows. Minor trimmable redundancy remains — the 'Running Analysis' section repeats the --max-old-space-size invocation already shown, and 'Typical analysis takes 30-120 seconds' adds little — so it fits the 4-anchor (efficient, minor instances that could be trimmed) rather than the 5-anchor's every-token-earns-its-place.

Actionability

Guidance is mostly executable: import statements, bash commands with memory flags, concrete function options (maxPaths: 5, maxDepth: 25, maxAttempts: 200), and field-level results (result.topBySize, result.newObjectGroups). It falls short of the 5-anchor because the streamNumberTuples callback is left as an empty template and every referenced helper file is absent from the bundle, so the copy-paste examples cannot actually run as shipped.

Workflow Clarity

A clear four-step sequence (Parse -> Compare -> Find Retainers -> Write Investigation Scripts) with an entry prerequisite, an error-recovery feedback loop (full-file read fails -> switch to streaming script), and documentation requirements (findings.md per dated subfolder). No explicit validation checkpoints exist (e.g., sanity-checking parsed node/edge counts against meta), which keeps it at the 4-anchor rather than 5; the destructive/batch cap does not apply since the analysis is read-only.

Progressive Disclosure

The SKILL.md body is well-sectioned and correctly delegates implementation to one-level-deep, clearly signaled helper links (parseSnapshot.ts, compareSnapshots.ts, findRetainers.ts, streamSnapshot.mjs). However, the bundle contains no helpers/ or scratchpad/ files — none of the referenced paths exist — so the split the design depends on is not realized and navigation cannot be verified. This sits between the 4-anchor (good structure, minor gaps) and worse: the referenced files being missing is a structural defect, matching the 3-anchor's 'could be better organized / references not backed by real files'.

Specificity

The description lists multiple concrete actions ('Analyze V8 heap snapshots', 'compare before/after snapshots', 'find what retains objects') plus a capability inventory ('snapshot parsing, comparison, retainer-path helpers'), with no vague filler and third-person voice throughout. This matches the 5-anchor's comprehensive concrete-action coverage rather than the 4-anchor, which requires minor gaps that are not evident here.

Completeness

What is answered explicitly ('Analyze V8 heap snapshots... Provides snapshot parsing, comparison, retainer-path helpers') and when is answered with concrete trigger phrases ('Use when given .heapsnapshot files, asked to compare before/after snapshots, asked to find what retains objects, or investigating why objects survive GC'). Both what and when are explicit with concrete triggers, matching the 5-anchor exactly; the 4-anchor requires a 'when' that could be more specific, which does not apply.

Trigger Term Quality

Good natural trigger coverage: '.heapsnapshot files', 'memory leaks', 'compare before/after snapshots', 'what retains objects', 'survive GC'. It misses common synonyms a user might naturally say, such as 'heap dump', 'memory usage/consumption', or 'DevTools', so it fits the 4-anchor (good coverage, a few natural terms missing) rather than the 5-anchor's comprehensive synonym/extension list.

Distinctiveness Conflict Risk

A clear niche (V8 heap snapshot analysis) anchored by a distinct file extension ('.heapsnapshot') and specific triggers (retainer paths, objects surviving GC), giving minimal overlap risk with other skills. It does not fall to the 4-anchor since no meaningful overlap with closely related skills is apparent.