Conciseness

The body is mostly lean tables and code blocks, but the same rules are stated three times: e.g., 'use *single asterisks*' appears in the styles table, again as 'NO **double asterisks** for bold' in What NOT to use, and again as Quick rule 1; the bullet-vs-numbered-list rule likewise appears in Lists, What NOT to use, and Quick rule 3. The 'Quick rules' section is almost entirely a restatement, matching the 'mostly efficient but could be tightened' anchor. Not a 2 because there is no concept-explanation padding; not a 4 because a whole redundant section could be cut.

Actionability

Every element has exact copy-paste-ready syntax: a styles table ('*text*', '_text_', '~text~'), literal link/mention formats ('<https://example.com|Link text>', '<@U1234567890>'), a full worked example message, and explicit anti-patterns ('NO [text](url) links'). This matches the 'fully executable; copy-paste ready; specific examples cover the common cases' anchor. Not a 4 because there are no gaps — the guidance is directly executable as written.

Workflow Clarity

This is a simple single-purpose skill: the sequence is 'detect Slack context (folder/JID check)' then 'apply the formatting reference'. The single action is unambiguous and the detection step is explicit, which the judging guidelines say can score 5 for simple skills. No destructive or batch operations exist, so the validation cap does not apply. Not a 4 because nothing in the flow is missing or implicit for the skill's scope.

Progressive Disclosure

No bundle files exist, and the content is a self-contained cheat sheet appropriately kept inline; sections (detection, formatting reference, anti-patterns, example) are well organized and navigable. It sits at the 'good structure; most content appropriately placed; minor organization gaps' anchor. Not a 5 because the body is ~90 lines (above the under-50-lines simple-skill allowance) and the example/quick-rules duplication means it could be split or trimmed for cleaner organization.

Specificity

"Format messages for Slack using mrkdwn syntax" names the domain (Slack/mrkdwn) and one concrete action (format messages). It matches the 'names domain and 1-2 concrete actions, but not comprehensive' anchor — no enumeration of what formatting covers (styles, links, mentions, lists) as the level-4/5 examples do. Not a 4 because only a single generic action is listed; not a 2 because the domain and action are concrete, not minimal.

Completeness

"Format messages for Slack using mrkdwn syntax" explicitly states what the skill does, and "Use when responding to Slack channels (folder starts with "slack_" or JID contains slack identifiers)" gives a concrete, explicit when-clause with trigger phrases. This mirrors the level-5 anchor structure almost exactly. Not a 4 because the when-clause is fully explicit with concrete detection conditions, not merely present.

Trigger Term Quality

"Slack", "Slack channels", "mrkdwn", and the literal "slack_" folder prefix give good natural keyword coverage — a user needing this would say "Slack". Missing a few natural variations ("Slack message", "Slack chat", "Slackbot") and any file-extension equivalents, so it falls just short of the comprehensive-synonyms anchor at 5. Clear of 3 because multiple distinct relevant terms are present rather than only some.

Distinctiveness Conflict Risk

Slack mrkdwn formatting is a clear niche with distinct triggers (Slack channels, slack_ folder prefix, JID identifiers); it would not plausibly fire for other formatting or messaging skills. Matches the 'clear niche with distinct triggers; minimal conflict risk' anchor. Not a 4 because the trigger conditions are uniquely Slack-specific with no meaningful overlap with closely related skills.