Polygraph

Skill polygraphso/litmus/plugins/polygraph/skills/polygraph

Behavioral litmus harness for MCP servers — the open @polygraphso/litmus package (CLI, library, MCP server).From the repository description

Install

npx -y skills add polygraphso/litmus --skill polygraph

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

8 stars8 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

Keep looking

Skills are one crate of 628,971. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.