Conciseness

The body contains only operational content — a URL template, placeholder resolution rules, and a fallback git command — with no explanation of concepts Claude already knows and no padding. Every token earns its place, matching anchor 5.

Actionability

Fully executable guidance: an exact URL template, concrete example values for every line-number case (`l=20`, `l=400-500`, `l=20,400-500`, `l=`), and a copy-paste command (`git merge-base HEAD origin/main`) with an explicit decision rule for the commit hash. Specific examples cover the common cases, matching anchor 5.

Workflow Clarity

This is a simple single-purpose skill and the single action is unambiguous; the only decision point (commit hash source) has an explicit if/otherwise rule. Per the simple-skill exception, this matches anchor 5.

Progressive Disclosure

The skill is under 50 lines with no need for external references; it is organized into a title and an Instructions section with numbered steps, and cites no dangling files (no bundle files exist). Per the under-50-line guideline, this matches anchor 5.

Specificity

The description names the domain ('link to files or specific lines in the Chromium codebase') and several concrete actions ('ensures links use the stable `source.chromium.org` format with line numbers and commit hashes'). It falls just short of anchor 5 because the action list is narrow for its niche — e.g., no mention of ranges or multi-line granularity, which is left to the body.

Completeness

It explicitly answers what ('ensures links use the stable `source.chromium.org` format with line numbers and commit hashes') and when ('Use this skill when you need to link to files or specific lines in the Chromium codebase within a document intended for external sharing (e.g., Google Docs, Buganizer)'), with concrete trigger phrases and an explicit negative trigger. This matches anchor 5 exactly.

Trigger Term Quality

Includes natural phrases a user would say ('link to files or specific lines in the Chromium codebase', 'Google Docs, Buganizer', '`source.chromium.org`', 'commit hashes') plus an explicit do-not-use boundary. A few natural synonyms are missing (e.g., 'Chromium source', 'code search'), matching anchor 4 rather than 5.

Distinctiveness Conflict Risk

Clear niche with distinct triggers (Chromium codebase links for externally shared documents) and an explicit exclusion ('Do not use for internal or purely local notes where file:/// links are preferred'), giving minimal conflict risk with other skills. Anchor 5 is the best fit.