claude

type DirWalker interface {
	WalkJSONL(root string, fn func(line []byte) error) error
}

type FileWriter interface {
	MkdirAll(path string, perm os.FileMode) error
	WriteFile(name string, data []byte, perm os.FileMode) error
	ReadFile(name string) ([]byte, error)
}

type ModelUsage struct {
	InputTokens  int
	OutputTokens int
	CacheCreate  int
	CacheRead    int
}

type OSDirWalker struct{}

type OSFileWriter struct{}

type UsageSummary struct {
	Models map[string]*ModelUsage
}