Function parse_param_value 

fn parse_param_value(raw: &str) -> Value

Best-effort coercion of a <parameter> body to a JSON value. Falls back to a string literal when the body is not valid JSON.

This is inherently lossy: the dialect gives no way to distinguish a parameter that is genuinely meant to be the string "true" or "123" from one meant to be the boolean or the number — both coerce to the typed value. There is no tool input_schema available here to disambiguate against (the parser has no access to the tool definitions that produced this call), so this is a best-effort guess, not a guarantee.