Conciseness

The body is information-dense — bullet points, tables, and a structure diagram with minimal prose padding and almost no explanation of concepts Claude already knows — matching 'efficient; minor instances of over-explanation that could be trimmed'; the full field-level record-type listing keeps it just below the lean 5.

Actionability

Concrete, specific guidance throughout — numeric targets (~4MB chunks, <100KB/>50MB bounds), per-use-case compression picks (zstd for remote, lz4 for local/real-time), and exact Lichtblick class/file paths — giving 'mostly executable guidance with minor gaps'; no copy-paste code, but the scoring note allows that for instruction-only skills.

Workflow Clarity

Content is well-organized and the indexed-reading flow plus numbered best practices give a loose sequence, but there is no explicit multi-step procedural workflow with validation checkpoints or a validate->fix->retry feedback loop, matching 'steps listed but checkpoints missing or implicit'.

Progressive Disclosure

Within-file structure is clean (clear headers, tables, logical sections), but the skill is a monolithic single file with no bundle references, and the detailed record-type reference and Lichtblick code-mapping table are inline content that could be split into separate reference files, matching 'some structure but content that should be separate is inline'.

Specificity

Names the MCAP domain plus several concrete sub-topics (binary structure, record types, indexing strategies, compression options) and one action ('creating MCAP files that optimize Lichtblick reading performance'), but the framing is a knowledge catalog rather than a comprehensive list of actions, so it sits at the anchor for 'names domain and 1-2 concrete actions, not comprehensive' rather than the more action-rich 4.

Completeness

The 'what' is clear (MCAP format knowledge and best practices for optimized file creation), but there is no 'Use when...' clause or equivalent explicit trigger guidance, so per the cap rule completeness cannot exceed 3.

Trigger Term Quality

The natural term 'MCAP' / 'MCAP files' is present, but the remaining phrases (binary structure, record types, indexing strategies) are technical internals a user would rarely say as a trigger, and there are no synonyms or extensions, matching 'some relevant keywords but missing common variations or synonyms'.

Distinctiveness Conflict Risk

'MCAP file format' and 'Lichtblick reading performance' name a highly specific niche with a distinct trigger ('MCAP') and minimal overlap with other skills, matching the 'clear niche with distinct triggers; minimal conflict risk' anchor.