Function validate_output 

pub fn validate_output(schema: &Value, content: &str) -> ArgValidation

Validate a submitted final output against the schema its blueprint declared.

Shape, not well-formedness. Whether the answer parses as the format it claims is format::check’s job, and runs before this. This answers the narrower question of whether the parsed document has the fields the author asked for, and runs only when they supplied a schema to ask with.

content is the agent’s submission verbatim. Because a schema means the author wants JSON, content that will not parse as JSON is a violation in its own right, reported the same way so the model can correct itself on the next turn.