Conciseness

Lean, imperative prose with no concept explanations Claude already knows ('Check the latest relevant run, not stale status', 'Do not chase downstream job failures...'). Minor trim opportunities: the opening sentence restates the frontmatter description and 'A default-branch failure is often a regression' is a mild explanatory aside.

Actionability

Provides executable git commands ('git log --oneline --decorate <green-sha>..<red-sha>'), named jobs to prioritize ('Generate', 'Integrate', 'Generate Internal'), and the concrete reproduction command ('./frb_internal ...'). Falls short of fully copy-paste ready because some steps are directional ('Study what changed', 'Fix the source of the regression').

Workflow Clarity

The Regression Workflow is a clearly numbered 1-6 sequence with a conditional checkpoint ('If the range is broad or the culprit is unclear, bisect') and a reproduction-verification question ('Does the failure reproduce at the red commit but not at the green baseline'). Missing one explicit validation step: confirming CI is green again after the fix before preparing the PR.

Progressive Disclosure

Self-contained skill with no bundle files; every section is appropriately sized and nothing that belongs in a separate file is inlined. References to peer skills ('frb-fix-ci', 'tom-ci', 'frb-prepare-pr') are clearly signaled by name, and the section organization (Choose a Path, Regression Workflow, What Not To Do, PR Expectations) makes navigation trivial.

Specificity

Names the domain ('flutter_rust_bridge CI fails on the default branch/main/master') and one concrete capability ('to distinguish ordinary CI repair from a regression'), but does not enumerate the skill's actual actions such as comparing green/red baselines or bisecting, so coverage is not comprehensive.

Completeness

The 'when' is explicit and specific ('Use when flutter_rust_bridge CI fails on the default branch/main/master'), and a 'what' is present ('to distinguish ordinary CI repair from a regression'), but the what is a single distinguishing clause rather than a concrete statement of the skill's actions.

Trigger Term Quality

Includes natural phrases users would say ('CI fails', 'default branch', 'main', 'master', 'regression', 'green'), but misses common synonyms like 'broken build', 'CI red on main', or the 'frb' abbreviation.

Distinctiveness Conflict Risk

Clear niche: FRB default-branch CI failures with explicit regression-vs-ordinary-repair disambiguation, which minimizes overlap with generic CI-repair skills.