Function readJSONRPCResponse

cmd/mcpcurl/main.go:489–509

readJSONRPCResponse reads lines from the scanner, skipping server-initiated notifications (messages without an "id" field), and returns the first response.

(scanner *bufio.Scanner)

// readJSONRPCResponse reads lines from the scanner, skipping server-initiated
// notifications (messages without an "id" field), and returns the first response.
func readJSONRPCResponse(scanner *bufio.Scanner) (string, error) {
	for scanner.Scan() {
		line := scanner.Text()
		// JSON-RPC responses have an "id" field; notifications do not.
		var msg map[string]json.RawMessage
		if err := json.Unmarshal([]byte(line), &msg); err != nil {
			return "", fmt.Errorf("failed to parse JSON-RPC message: %w", err)
		}
		if _, hasID := msg["id"]; hasID {
			if errField, hasErr := msg["error"]; hasErr {
				return "", fmt.Errorf("server returned error: %s", string(errField))
			}
			return line, nil
		}
		// No "id" — this is a notification, skip it
	}
	if err := scanner.Err(); err != nil {
		return "", err
	}
	return "", fmt.Errorf("unexpected end of output")
}

func printResponse(response string, prettyPrint bool) error {
	if !prettyPrint {