Conciseness

The body is information-dense with tables and platform-specific facts (e.g. "base64-encoded 256-bit" for generateValue, "/etc/secrets/<filename>", "bind ... to 0.0.0.0 and PORT") rather than padding; it assumes Claude's competence and avoids explaining general concepts, hitting the lean-and-efficient anchor.

Actionability

Gives concrete actionable guidance — exact keys (sync: false, generateValue: true, fromDatabase/fromService/fromGroup), file paths, precedence rules, and defaults — appropriate for a config/reference skill; the rubric notes absence of inline code is not penalized when guidance is actionable, and executable YAML lives correctly in references.

Workflow Clarity

As a reference/config skill its discrete actions (set a var, create a group, wire a secret) are unambiguous and organized under clear sections, with a Common Issues troubleshooting list including a validation tip ("test in a scratch service"); per the simple-skills note, clear organization warrants 3 since no fragile multi-step destructive workflow requires explicit checkpoints.

Progressive Disclosure

The body is an overview that points to two real, one-level-deep reference files (wiring-reference.md, platform-variables.md), each well-signaled inline and listed in a References section; verified the references do not chain further, matching the clear-overview-with-one-level-deep-references anchor.

Specificity

Lists multiple concrete actions — "Configures environment variables, secrets, and env groups", "wire secrets between services", "create env groups", "use generateValue", "set sync: false", "troubleshoot missing or incorrect ... values" — matching the anchor for multiple specific concrete actions rather than the single-domain level 2.

Completeness

Explicitly answers both halves: "what" ("Configures environment variables, secrets, and env groups on Render") and "when" (an explicit "Use when the user needs to ..." clause enumerating triggers), which is the level-3 anchor.

Trigger Term Quality

Uses natural terms a Render user would say — "env vars", "secrets", "env groups", "generateValue", "sync: false", "Blueprints", "Dashboard" — giving good coverage of phrasings users actually invoke, not just technical jargon.

Distinctiveness Conflict Risk

The Render-specific niche with distinctive triggers (generateValue, sync: false, env groups, Blueprint/Dashboard) makes it unlikely to fire for an unrelated skill, satisfying the clear-niche anchor.