@type t() :: %OpenCode.Generated.ToolPart{
  call_id: String.t(),
  id: String.t(),
  message_id: String.t(),
  metadata: map() | nil,
  session_id: String.t(),
  state:
    OpenCode.Generated.ToolStateCompleted.t()
    | OpenCode.Generated.ToolStateError.t()
    | OpenCode.Generated.ToolStatePending.t()
    | OpenCode.Generated.ToolStateRunning.t(),
  tool: String.t(),
  type: String.t()
}