Conciseness

Individual passages are efficient and factual, but the no-provisioning/deprecation message is repeated roughly seven times (Activation Contract, gotchas, tool sections, Scenario 1, Key principle), and "When to use this skill" / "How to use this skill" substantially restate the Activation Contract and the tool-selection table. It fits anchor 3 ("could be tightened") rather than anchor 2 because no space is spent explaining concepts Claude already knows — the issue is duplication, not padding with known material.

Actionability

Guidance is copy-paste ready: exact call shapes such as `queryPermissions(action="getResourcePermission", resourceType="sqlDatabase", resourceId="<tableName>")`, a complete runQuery JSON payload, the `_openid VARCHAR(64) DEFAULT '' NOT NULL` column requirement, and `manageMysqlDatabase(action="destroyMySQL", confirm=true)`. The common cases (query, write, permissions read/write, destroy) are each covered with a concrete example.

Workflow Clarity

Five numbered scenario flows with explicit validation checkpoints: read-only inspection before writes, confirmation and instance checks before destroy, polling `describeTaskStatus` until completion, verifying the instance is gone afterward, and explicit failure handling ("treat the returned error as the terminal result"). Destructive operations are fully gated, matching the anchor-5 pattern.

Progressive Disclosure

With no bundle files present, the body is self-contained and well-structured by headers, and sibling-skill references (`../relational-database-web-cloudbase/SKILL.md`, `../http-api-cloudbase/SKILL.md`) are one level deep and clearly signaled in a dedicated "Then also read" section. It falls short of 5 because the full tool reference and compatibility notes are inlined in a single ~200-line file with some duplicated sections that could be consolidated or split.

Specificity

The description lists multiple specific concrete actions — "inspect, write SQL, schema, permissions, destroy" — tied to four named MCP tools (queryMysqlDatabase, manageMysqlDatabase, queryPermissions, managePermissions), giving comprehensive coverage of the skill's scope. It exceeds anchor 4 because the action list covers the full capability surface rather than leaving minor gaps.

Completeness

Both what ("inspect, write SQL, schema, permissions, destroy" on an existing instance) and when ("Read this when the environment already has a MySQL instance and the task is queryMysqlDatabase, manageMysqlDatabase, queryPermissions, or managePermissions") are explicitly answered with concrete trigger phrases. This matches the anchor-5 example structure of a full capability list followed by an explicit 'Use when' clause.

Trigger Term Quality

Good keyword coverage including natural terms like "MySQL", "SQL", "schema", "permissions", "destroy", and "inspect", plus the tool names an agent would see in context. Not 5 because common variations such as "table", "SELECT", "instance", or "database management" are missing; not 3 because the terms present are natural and multiple rather than a sparse set.

Distinctiveness Conflict Risk

The description carves out a clear niche with explicit boundaries and redirects: "[Deprecated] Existing CloudBase MySQL only", "Do not recommend MySQL for new relational work — use postgresql-development", and "Do not provision MySQL". Conflict risk with sibling skills is actively minimized by these redirect statements.