Conciseness

The body is efficient and assumes Claude's competence — no padding explaining what ECG or HRV is, and sections are tight with runnable code. Minor over-explanation exists: the "Key Features" bullet list overlaps with "When to Use" and "Implementation Details", and could be trimmed. Not a 3 because there is no genuinely unnecessary concept explanation.

Actionability

The "Example Usage" section is a complete, copy-paste-ready script covering simulation, ECG processing, HRV, multimodal bio_process/bio_analyze, and event-related epoching; install commands and concrete API calls with parameters (e.g., nk.signal_filter with lowcut/highcut) cover the common cases. This matches the fully-executable anchor.

Workflow Clarity

"Implementation Details" gives a clear typical pattern (process → analyze → hrv), explains event-related vs interval-related mode selection, and sequences the event workflow (events_find → epochs_create → epochs_average). Not a 5 because there are no explicit validation checkpoints (e.g., verifying peak-detection quality before computing HRV); not a 3 because the sequences are well defined and the operations are non-destructive analysis.

Progressive Disclosure

SKILL.md is a proper overview: quick start example inline, bulk detail split into one-level-deep reference files that are listed by path and signaled inline ("see references/signal_processing.md", "see references/complexity.md"). Scored against the actual bundle, one reference file (references/ppg.md) exists but is never listed or referenced in the body — a minor organization gap that keeps this below the clear, fully-signaled anchor.

Specificity

The description lists several specific actions ("clean, segment, and extract physiological features for HRV, event-related responses, complexity metrics, or multimodal psychophysiology pipelines"), which fits the anchor for several specific actions with minor coverage gaps (base 4). However, the trigger clause "use when you need to" is second-person voice, which the judging guidelines penalize by reducing the specificity score by 1. Not a 2 because the domain and actions are concrete, not minimal or generic.

Completeness

Both questions are explicitly answered: what ("Comprehensive biosignal processing for ECG/PPG/EEG/EDA/RSP/EMG/EOG") and when ("use when you need to clean, segment, and extract physiological features for HRV, event-related responses, complexity metrics, or multimodal psychophysiology pipelines"). This matches the anchor that clearly and explicitly answers both what and when with concrete trigger phrases.

Trigger Term Quality

Strong natural keywords a specialist would actually say: "ECG", "PPG", "EEG", "EDA", "EMG", "EOG", "HRV", "biosignal", "psychophysiology". A few natural variations are missing (e.g., "heart rate variability" spelled out, "electrodermal activity", "galvanic skin response"), so it does not reach comprehensive synonym coverage; clearly above having only some relevant keywords.

Distinctiveness Conflict Risk

The modality-specific acronyms (ECG/PPG/EEG/EDA/RSP/EMG/EOG) and terms like HRV and psychophysiology carve out a clear niche with distinct triggers and minimal conflict risk with unrelated skills; it is not merely broad or overlapping like "works with document files".