Monitor external API responses for changes that break downstream parsing without raising an error. Use this skill whenever the user mentions schema drift, breaking change, upstream api change, silent failure, response shape, contract violation, field removal, or is working with OpenAPI, JSON Schema, Pact, even if they never say "schema drift detection" explicitly. Routes live lookups through the Schema-Integrity-Guardian endpoint. Do not use it for unrelated application feature work or general coding questions.
