Conciseness

Nearly every section conveys non-obvious, project-specific knowledge Claude cannot infer (make prerequisite behavior, flatten-maven pitfalls, buildx stalls) with no filler explanation of known concepts. It falls short of the top anchor only through mild repetition — the fast mvn command and 'do not skip flatten:flatten' guidance each appear three times ('Pick the right command', 'Common pitfalls', 'The golden rule').

Actionability

Every scenario has a copy-paste-ready command (e.g., './mvnw -pl apm-dist -am -o clean flatten:flatten package -Pbackend,dist -DskipTests -Dcheckstyle.skip=true -Dmaven.javadoc.skip=true'), and the verification procedure is fully concrete ('docker cp <container>:/skywalking/oap-libs/... /tmp/verify.jar', 'jar -xf', 'grep -oa'). Placeholders like <module>-<version>.jar are inherent parameters rather than pseudocode, matching the 'fully executable, covers common cases' anchor.

Workflow Clarity

The workflow is a clear decision tree by change type (OAP source, dist packaging only, Dockerfile only), followed by an explicit validation checkpoint ('Verify the fix reached the image') and a feedback loop ('If grep finds nothing... Re-run with the correct chain'), plus recovery guidance for failure modes (half-built dist, stalled buildx). This matches the top anchor: explicit validation steps with error-recovery loops.

Progressive Disclosure

A single self-contained file with well-labeled sections, a summary table, and no nested or dead references — good structure with minor organization gaps. It is not the top anchor because at ~107 lines, with no bundle files provided, sections like the rationale for make's dependency behavior and the 'Common pitfalls' list could be split into a reference file to keep SKILL.md as a leaner overview.

Specificity

Names the domain ('SkyWalking distribution and OAP Docker image') with exactly two concrete actions — rebuild the dist and rebuild the image — matching the anchor for 'domain and 1-2 concrete actions, not comprehensive'; it does not list several actions (e.g., verification, picking the right build chain) needed for a higher score.

Completeness

Explicitly answers both: what ('Rebuild the SkyWalking distribution and OAP Docker image after source changes') and when ('Use before running e2e tests so the image reflects your code changes') with a concrete trigger phrase. The 'when' clause is explicit and specific, matching the top anchor rather than the 'could be more explicit' level 4.

Trigger Term Quality

Contains natural phrases users would say when needing this skill — 'rebuild', 'Docker image', 'e2e tests', 'source changes', 'stale jars', 'OAP' — but misses a few common synonyms like 'tarball', 'package', or 'docker build'. Good coverage with a few natural terms missing, so anchor 4 rather than 5.

Distinctiveness Conflict Risk

The description is anchored to a clearly distinct niche (SkyWalking OAP dist/image rebuild) with triggers ('e2e tests', 'stale jars') that no generic build or docker skill would match, giving minimal conflict risk — the top anchor.