DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
New telemetry tracks when plugin/skill frontmatter contains unknown keys or type mismatches against the expected schema. This helps identify misconfigured plugins without breaking them.
Evidence
Validation function pwH at line ~205424 (search for "tengu_frontmatter_shadow_unknown_key").
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
