Conciseness

The body is efficient and command-first with almost no explanation of concepts Claude already knows, but there are minor instances that could be trimmed: the Overview spells out the two tracking tables, and the References section re-lists link definitions already given inline. It matches the 4 anchor (efficient, minor trimming possible) rather than 5 (every token earns its place).

Actionability

Guidance is fully executable and copy-paste ready: docker run with LIQUIBASE_COMMAND_* env-var forwarding, Maven plugin XML, complete YAML changesets with rollback blocks, the validate/status/update-sql/update gate, and a CI YAML block with a bash lb() wrapper. Specific examples cover the common cases, matching the 5 anchor.

Workflow Clarity

Steps 1-8 are clearly sequenced, and Step 3 is an explicit validation gate ("Run these in order; stop at the first failure") with feedback loops for error recovery — checksum errors (revert, new changeset, or justified validCheckSum) and held locks (release-locks) — plus update-testing-rollback as verification. This matches the 5 anchor; the destructive/batch cap of 3 does not apply since validation is central.

Progressive Disclosure

The single ~300-line file is well sectioned with clear headers and one-level-deep external doc links, giving good structure and easy navigation. However, content that could live in separate reference files (precondition predicate list, CI config, anti-pattern table) is inlined, and Step 8 references agents (migration-blast-radius-reviewer, migration-operation-taxonomy) that are not part of this bundle, so it fits the 4 anchor rather than 5.

Specificity

The description lists multiple concrete capabilities — "update, status, rollback and tag, preconditions, contexts and labels, and the changelog lock tables" plus changeset formats — giving comprehensive coverage of the domain with no notable gaps, matching the 5 anchor rather than 4.

Completeness

It explicitly answers both what (commands, changelog/changeset management, preconditions, contexts/labels, lock tables) and when ("Use whenever a schema is managed with Liquibase") with a concrete trigger condition, matching the 5 anchor.

Trigger Term Quality

Good keyword coverage ("Liquibase", "changelog", "changeset", "rollback", "schema", "migrations", "XML, YAML, JSON or SQL") but a few natural terms are missing, such as filename patterns like db.changelog-master.xml or .yaml extensions users would mention. It sits between the 4 and 5 anchors, closer to 4.

Distinctiveness Conflict Risk

"Use whenever a schema is managed with Liquibase" carves out a clear named-tool niche with distinct triggers; conflict risk with other skills is minimal even against sister migration tools.