Conciseness

The body is lean and assumes domain competence — no explanation of what RNA-seq, strandedness, or MultiQC are; every line carries operational content. A few dense passages could be trimmed, most notably the overlapping flag semantics ('Omit --execute for validation plus Snakemake workflow validation only. Use --no-dry-run only when...') which read as confusing rather than merely terse, keeping it below the level-5 anchor.

Actionability

Full copy-paste-ready commands with concrete arguments: the runner invocation with --sample-sheet, --fastq-root, reference flags, and --execute, plus two preflight invocations with explicit flags. Decision points give concrete, checkable actions ('Inspect per-sample reads, mapping rate, rRNA/mitochondrial fraction...'). This matches the fully-executable, covers-common-cases anchor.

Workflow Clarity

A coherent sequence is present — confirm essential inputs, run preflight, choose a route, run with or without --execute — with real validation checkpoints (dry-run/validation-only mode, Snakemake workflow graph validation, resource readiness checks, and a QC verdict JSON covering outlier samples). It falls short of the level-5 anchor because the sequence is organized by topic sections rather than an explicit ordered flow with feedback loops (what to do when validation or readiness fails is not stated).

Progressive Disclosure

The SKILL.md is a well-organized overview (~66 lines) with clearly delineated sections (inputs, route, decision points, outputs) and no nested or buried references — runner paths point at plugin scripts rather than bundle reference files. It misses the level-5 anchor partly because it slightly exceeds the simple-skill line, and the long Outputs/resource-bundle enumerations (resource plan, manifest, env exports, readiness summary) are exactly the kind of detail that could move one level deep into a reference file.

Specificity

The description lists multiple concrete capabilities — 'FASTQ-to-count processing with sample-sheet, strandedness, genome annotation, alignment or pseudoalignment, MultiQC, and count-matrix QC checks' — naming both specific pipeline stages and tools. It matches the level-5 anchor for multiple specific concrete actions with comprehensive coverage of the processing stages.

Completeness

The 'what' is clear ('Run or plan bulk RNA-seq FASTQ-to-count processing...'), but there is no 'Use when...' clause or equivalent explicit trigger guidance — the when is at best weakly implied by the domain terms. Per the judging guidelines, a missing 'Use when...' clause caps completeness at 3; it is not 4 because the when is entirely absent rather than present-but-imprecise.

Trigger Term Quality

Natural terms like 'bulk RNA-seq', 'FASTQ', 'count-matrix', 'MultiQC', and 'QC' are present and would be said by users needing this skill. A few common variations are missing — 'gene counts', 'read alignment', '.fastq' extensions, and 'expression matrix' — so it sits between the 4 and 5 anchors, closer to 4.

Distinctiveness Conflict Risk

'Bulk RNA-seq FASTQ-to-count processing' plus named tools (MultiQC, pseudoalignment) carves a clear niche distinct from adjacent skills (e.g., differential expression, ChIP-seq, scRNA-seq). Minor overlap risk remains with a differential-expression or general-QC skill since the description does not explicitly bound the scope the way the body does; it is not 5 because that boundary ('if the user already has a count matrix...') appears only in the body, not the description.