# rpc error: code = Internal desc = grpc: failed to send message: stream is already closed

- **ID:** `go/grpc-stream-already-closed`
- **Domain:** go
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Calling Send on a client or server stream after CloseSend or after the stream returned io.EOF. Often caused by concurrent Send from multiple goroutines.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.50+ | active | — | — |

## Workarounds

1. **** (94% success)
   ```
   for _, m := range msgs {
    if err := stream.Send(m); err != nil {
        if err == io.EOF { break }
        return err
    }
}
return stream.CloseSend()
   ```
2. **** (85% success)
   ```
   for {
    stream, err := client.Push(ctx)
    if err != nil { return err }
    if err := sendAll(stream, batch); err != nil { return err }
    if _, err := stream.CloseAndRecv(); err != nil { return err }
    if done(batch) { return nil }
}
   ```

## Dead Ends

- **** — gRPC streams are one-shot; CloseSend is idempotent but does not reopen the stream for sending. (90% fail)
- **** — Subsequent Sends return the same error; the messages are silently dropped. (88% fail)