Use this plugin when the user wants to create, improve, validate, publish, or submit an Open Design plugin using the plugin spec, examples, and PR workflow.
SkillScore75Maintained
Automatic
◆Coding pack
Last verified 8/28/2026
What it changes
Passed 16 of 21 test cases with the skill, and 7 of 21 without it.
Without skill33%
With skill75%
Checks it passed that the model alone missed
Scaffolds SKILL.md in the plugin directory.
Lists SKILL.md as a required scaffolded file.
Scaffolds open-design.json instead of plugin.yaml.
and 15 more in the full report
12 fixed6 passed either way4 still failing2 broke
Pass-rate lift
+42 pp
Tokens
+23%
Agent turns
0%
Response time
+10%
Model gemini-3.6-flashMeasured 8/28/2026v118 of 24 cases passed with skill · 21 comparable
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 12
Prompt
We are building a PDF generator plugin. After validating JSON and running repo checks, what is the final step in the authoring workflow?
What was checked, without and with the skill
Checked
Without skill
With skill
Specifies preparing pull request instructions as the final step.
Missed
Passed
case-18 · gemini-3.6-flash · 8/28/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md13 linessingle file
Extend Plugin Author
Workflow
Read plugins/spec/SPEC.md and the closest example plugin.
Identify the target lane, mode, trigger description, required atoms, inputs, and capabilities.
Scaffold a plugin folder with SKILL.md, open-design.json, README.md, and evals when useful.
Validate JSON and run available repo checks.
Prepare publish or PR instructions.
Output Contract
Produce a complete plugin folder and authoring-summary.md.