package structuredoutput

import "strings"

var malformedMarkers = []string{
	"malformed structured output",
	"decode structured output:",
	"decode provider response envelope:",
	"provider response missing choices",
	"provider response missing assistant message content",
	"provider response assistant message content is empty",
	"provider response assistant message content is not valid JSON",
}

// IsMalformedError reports whether err matches provider malformed
// structured-output failure markers that should be downgraded.
func IsMalformedError(err error) bool {
	if err == nil {
		return false
	}
	msg := err.Error()
	for _, marker := range malformedMarkers {
		if strings.Contains(msg, marker) {
			return true
		}
	}
	return false
}