maxTemplateNodes bounds the template’s STRUCTURE as stored (countTemplateNodes), distinct from the interpretation budget.
Validation rejects deeper nesting; interpretation stops at the node budget and marks the render truncated.
The http action request limits (deadline, response size, content type) are on Action definition.
Generated from the validators
Limits
The per-user and structural limits the server enforces on stored entries, templates and prompt actions — derived from the store defaults and validators.