Function cargo_root_cohort_key 

pub fn cargo_root_cohort_key(
    project: ProjectInstanceId,
    package: &str,
    manifest: &str,
    directory: &str,
) -> Result<CanonicalResolutionKey, GraphContractError>

Canonical invalidation cause emitted only by admitted explicit sibling roots.

Its configuration role is distinct from automatic inventory, so an unlisted helper cannot invalidate explicit roots when automatic discovery is disabled.

Errors

Returns a graph contract error for invalid package, manifest or directory identity.