Claude skills for SEO, tested

How to read these tables

Without -> with

The score on the task set with no skill loaded, then with the skill loaded. For classes scored against an answer key, this is the share of seeded items found. For classes scored by blind comparison, it is how often a grader preferred the skill's output over the baseline's, with the baseline shown as the complement.

Effect (range)

With minus without, averaged over the models tested, with the lowest and highest per-model value in brackets. Per-model intervals are on each skill's page.

Orbit

• Stable: delta at or above the pass threshold, and the interval excludes zero
• Past the horizon: delta at or below the failure floor, and the interval excludes zero
• In free drift: the interval spans zero, or the delta sits between the floor and the threshold
• Unobservable: the cell cannot be classified: sub-case (a) an unbounded scale, or sub-case (b) both arms at the same bound

A fifth value, Decaying, is defined and appears once a skill has been re-tested: a cell previously Stable that has fallen below the pass threshold on a later run.

Cohort

The repository that publishes the skill. Rows marked with an asterisk come from the repository the operator of this site maintains, so those are the operator measuring its own work. The rest were chosen by a stated rule and not by preference.

Commit

The exact version tested. Later commits are not covered by this verdict.

Injected context tokens

How much text the skill adds to the model's context. This is cost, not quality; a bigger number is not a better one. Measured from the input tokens the API reported on the with arm, averaged over that skill's records.

Tested

The date. Verdicts age as models change.