# `ExMCP.Client.NotificationListener.Ref`
[🔗](https://github.com/azmaveth/ex_mcp/blob/v1.5.0/lib/ex_mcp/client/notification_listener.ex#L91)

A reference to a registered legacy notification listener.

# `t`

```elixir
@type t() :: %ExMCP.Client.NotificationListener.Ref{
  client: pid(),
  filter: map(),
  id: reference(),
  subscriber: pid()
}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*