Actionable validation diagnostic returned so an agent can repair a malformed spec and retry.
Concrete instruction on how to fix the issue.
Human and agent readable explanation of what is wrong.
JSON path to the offending field (e.g. "edges[2].to" or "nodes[1].lane").
"edges[2].to"
"nodes[1].lane"
Actionable validation diagnostic returned so an agent can repair a malformed spec and retry.